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X - Possible homology level

H - Homology level

T - Topology level

F - Family level

* - Provisional representative


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Evolutionary classification of protein domain structures

alpha arraysalpha-helix arrays with mainly perpendicular helices

alpha bundlesalpha-helix bundles with mainly parallel helices

alpha superhelicesrepeating alpha-helix hairpins form a superhelix

alpha duplicates or obligate multimersalpha duplicates or monomers associate together to form a compact domain

alpha complex topologyalpha domain with complex and unique topology that cannot be described as array or bundle or superhelix

beta barrelssingle beta-sheet folded upon itself to form a barrel

beta meanderssingle beta-sheet with mainly meander topology

beta sandwichestwo beta-sheets stacked together to form a sandwich

beta duplicates or obligate multimersbeta duplicates or monomers associate together to form a compact domain

beta complex topologybeta domains with complex and unique topology that cannot be described as barrel or sandwich or meander

a+b two layersone alpha-helix layer and one beta-sheet layer

a+b three layersone mainly antiparallel beta-sheet layer sandwiched between two alpha-helix layers

a+b four layerstwo beta-sheet layers sandwiched between two alpha-helix layers

a+b complex topologyalpha and beta domain with complex and unique topology that cannot be described in layers

X: C-terminal domain in beta subunit of DNA dependent RNA-polymerase
H: C-terminal domain in beta subunit of DNA dependent RNA-polymerase
T: C-terminal domain in beta subunit of DNA dependent RNA-polymerase
F: RNA_pol_Rpb2_6,RNA_pol_Rpb2_7

PF00562 PF04560

Representatives:

e1smyC7[C:1000-1119] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE BETA CHAIN ; ligands: MG ; X-RAY DIFFRACTION 2.7Å

e8g00I1[I:1240-1341] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ELECTRON MICROSCOPY

e8g1sI5[I:1240-1341] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ELECTRON MICROSCOPY

e8g2wI8[I:1240-1341] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ELECTRON MICROSCOPY

e8g4wI7[I:1240-1341] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ELECTRON MICROSCOPY

e8g7eI4[I:1240-1341] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ELECTRON MICROSCOPY

e8g8zI4[I:1240-1341] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ELECTRON MICROSCOPY

e8b3fB2[B:1054-1174] Image Pymol Jmol Links: PDB, SCOP, CATH

; ligands: ZN ; ELECTRON MICROSCOPY

e8oevB4[B:1131-1251] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ligands: ZN ; ELECTRON MICROSCOPY

e8oewB4[B:1131-1251] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ligands: ZN ; ELECTRON MICROSCOPY

e8of0B6[B:1131-1251] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ligands: ZN ; ELECTRON MICROSCOPY

e8p4bB7[B:1054-1174] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ligands: ZN ; ELECTRON MICROSCOPY

e8p4cB3[B:1054-1174] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ELECTRON MICROSCOPY

e8p4dB2[B:1054-1174] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ELECTRON MICROSCOPY

e8p4fB1[B:1054-1174] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ligands: ZN ; ELECTRON MICROSCOPY

e7uweI3[I:1240-1342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ELECTRON MICROSCOPY

e7uwhI10[I:1240-1342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ELECTRON MICROSCOPY

e8h40A2[A:985-1100] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase subunit beta ; ELECTRON MICROSCOPY

e8hkcC3[C:1238-1342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ELECTRON MICROSCOPY

e8he5B3[B:1098-1222] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ligands: ZN ; ELECTRON MICROSCOPY

e8jh2B6[B:1098-1222] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ligands: ZN ; ELECTRON MICROSCOPY

e8jh3B5[B:1098-1222] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ligands: ZN ; ELECTRON MICROSCOPY

e8jh4B1[B:1098-1222] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ligands: ZN ; ELECTRON MICROSCOPY

e7wbwB5[B:1098-1222] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ligands: ZN ; ELECTRON MICROSCOPY

e7wbxB6[B:1098-1222] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ligands: ZN ; ELECTRON MICROSCOPY

e2nvxB5[B:1098-1222] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE II 140 KDA POLYPEPTIDE ; ligands: ZN ; X-RAY DIFFRACTION 3.6Å

e4wqsM3[M:999-1119] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase subunit beta ; X-RAY DIFFRACTION 4.300Å

e4wqtH2[H:1000-1112] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase subunit beta ; X-RAY DIFFRACTION 4.400Å

e4wqtC2[C:1000-1112] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase subunit beta ; X-RAY DIFFRACTION 4.400Å

e4wqtM1[M:1000-1112] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase subunit beta ; X-RAY DIFFRACTION 4.400Å

e4s20H6[H:1238-1342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase subunit beta ; X-RAY DIFFRACTION 4.7Å

e1ynjC7[C:999-1114] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase beta chain ; X-RAY DIFFRACTION 3.2Å

e2o5iC7[C:999-1118] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE BETA CHAIN ; X-RAY DIFFRACTION 2.5Å

e2a6eM7[M:999-1118] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE BETA CHAIN ; X-RAY DIFFRACTION 2.8Å

e2a69M7[M:999-1118] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE BETA CHAIN ; ligands: MG,RPT ; X-RAY DIFFRACTION 2.5Å

e1smyM7[M:999-1118] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE BETA CHAIN ; X-RAY DIFFRACTION 2.7Å

e2o5iM7[M:999-1118] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE BETA CHAIN ; X-RAY DIFFRACTION 2.5Å

e2ppbM7[M:999-1118] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE BETA CHAIN ; X-RAY DIFFRACTION 3.0Å

e1iw7C7[C:999-1118] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RNA POLYMERASE BETA SUBUNIT ; ligands: MG ; X-RAY DIFFRACTION 2.6Å

e2a69C7[C:999-1118] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE BETA CHAIN ; ligands: MG ; X-RAY DIFFRACTION 2.5Å

e2a6hM7[M:999-1118] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE BETA CHAIN ; X-RAY DIFFRACTION 2.4Å

e2a6hC7[C:999-1118] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE BETA CHAIN ; X-RAY DIFFRACTION 2.4Å

e2a68C7[C:999-1118] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE BETA CHAIN ; ligands: MG ; X-RAY DIFFRACTION 2.5Å

e2o5jC7[C:999-1118] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE BETA CHAIN ; X-RAY DIFFRACTION 3.0Å

e2o5jM7[M:999-1118] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE BETA CHAIN ; X-RAY DIFFRACTION 3.0Å

e2cw0C7[C:999-1118] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase beta chain ; X-RAY DIFFRACTION 3.3Å

e1iw7M7[M:999-1118] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RNA POLYMERASE BETA SUBUNIT ; ligands: MG ; X-RAY DIFFRACTION 2.6Å

e1ynnC7[C:999-1114] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase beta chain ; X-RAY DIFFRACTION 3.3Å

e3dxjM7[M:999-1118] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

BACTRIAL RNA POLYMERASE BETA SUBUNIT; CHAIN C, M ; ligands: NE6 ; X-RAY DIFFRACTION 3.0Å

e3dxjC7[C:999-1118] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

BACTRIAL RNA POLYMERASE BETA SUBUNIT; CHAIN C, M ; ligands: NE6,PO4 ; X-RAY DIFFRACTION 3.0Å

e1zyrM7[M:999-1118] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE BETA CHAIN ; X-RAY DIFFRACTION 3.0Å

e1zyrC7[C:999-1118] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE BETA CHAIN ; X-RAY DIFFRACTION 3.0Å

e2ppbC7[C:999-1118] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE BETA CHAIN ; X-RAY DIFFRACTION 3.0Å

e2cw0M7[M:999-1118] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase beta chain ; X-RAY DIFFRACTION 3.3Å

e2be5C7[C:999-1118] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE BETA CHAIN ; X-RAY DIFFRACTION 2.4Å

e2ghoC7[C:999-1114] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase subunit beta ; X-RAY DIFFRACTION 4.1Å

e2a68M7[M:999-1118] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE BETA CHAIN ; ligands: MG ; X-RAY DIFFRACTION 2.5Å

e1i6vC7[C:999-1115] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE ; X-RAY DIFFRACTION 3.3Å

e2a6eC7[C:999-1118] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE BETA CHAIN ; X-RAY DIFFRACTION 2.8Å

e2be5M7[M:999-1118] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE BETA CHAIN ; X-RAY DIFFRACTION 2.4Å

e3aohC7[C:999-1112] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE SUBUNIT BETA ; X-RAY DIFFRACTION 4.1Å

e4g7hC7[C:1006-1118] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE SUBUNIT BETA ; X-RAY DIFFRACTION 2.9Å

e3eqlC7[C:999-1119] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE SUBUNIT BETA ; ligands: MXP ; X-RAY DIFFRACTION 2.7Å

e3eqlM7[M:999-1119] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE SUBUNIT BETA ; ligands: MXP ; X-RAY DIFFRACTION 2.7Å

e4g7oM7[M:999-1111] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE SUBUNIT BETA ; X-RAY DIFFRACTION 2.99Å

e4g7hM7[M:999-1111] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE SUBUNIT BETA ; X-RAY DIFFRACTION 2.9Å

e4g7zM7[M:999-1111] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE SUBUNIT BETA ; X-RAY DIFFRACTION 3.81Å

e4g7zC7[C:999-1111] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE SUBUNIT BETA ; X-RAY DIFFRACTION 3.81Å

e4g7oC7[C:999-1111] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE SUBUNIT BETA ; X-RAY DIFFRACTION 2.99Å

e4gzyC25[C:1000-1112] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase subunit beta ; X-RAY DIFFRACTION 3.500Å

e4gzzC25[C:1000-1112] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase subunit beta ; X-RAY DIFFRACTION 4.000Å

e3aoiC18[C:1000-1112] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE SUBUNIT BETA ; X-RAY DIFFRACTION 4.3Å

e3aoiH18[H:1000-1112] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE SUBUNIT BETA ; X-RAY DIFFRACTION 4.3Å

e3aoiM18[M:1000-1112] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE SUBUNIT BETA ; X-RAY DIFFRACTION 4.3Å

e3iydC11[C:1238-1342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase subunit beta ; ELECTRON MICROSCOPY

e2nvzB21[B:1098-1223] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase II 140 kDa polypeptide ; ligands: ZN ; X-RAY DIFFRACTION 4.2Å

e2e2hB21[B:1098-1223] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE II 140 KDA POLYPEPTIDE ; ligands: ZN ; X-RAY DIFFRACTION 3.95Å

e3aohH13[H:1000-1111] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE SUBUNIT BETA ; X-RAY DIFFRACTION 4.1Å

e3aohM13[M:1000-1112] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE SUBUNIT BETA ; X-RAY DIFFRACTION 4.1Å

e3wodC13[C:1000-1118] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase subunit beta ; X-RAY DIFFRACTION 3.6Å

e4ljzC26[C:1238-1342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase subunit beta ; X-RAY DIFFRACTION 3.5871Å

e4ljzI26[I:1238-1342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase subunit beta ; X-RAY DIFFRACTION 3.5871Å

e4lk1C26[C:1238-1342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase subunit beta ; X-RAY DIFFRACTION 3.8369Å

e4lk1I26[I:1238-1342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase subunit beta ; X-RAY DIFFRACTION 3.8369Å

e4lk0C26[C:1238-1342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase subunit beta ; X-RAY DIFFRACTION 3.900Å

e4lk0I26[I:1238-1342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase subunit beta ; X-RAY DIFFRACTION 3.900Å

e4llgC26[C:1238-1342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase subunit beta ; X-RAY DIFFRACTION 3.7936Å

e4llgI26[I:1238-1342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase subunit beta ; X-RAY DIFFRACTION 3.7936Å

e4kmuH17[H:1238-1342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE SUBUNIT BETA ; X-RAY DIFFRACTION 3.85Å

e4kn4C17[C:1238-1342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE SUBUNIT BETA ; X-RAY DIFFRACTION 3.96Å

e4kn4H17[H:1238-1342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE SUBUNIT BETA ; X-RAY DIFFRACTION 3.96Å

e4kn7C17[C:1238-1342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE SUBUNIT BETA ; X-RAY DIFFRACTION 3.69Å

e4kn7H17[H:1238-1342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE SUBUNIT BETA ; X-RAY DIFFRACTION 3.69Å

e4jkrI17[I:1238-1342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase subunit beta ; X-RAY DIFFRACTION 4.20Å

e4mq9C4[C:999-1119] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed,

DNA-DIRECTED RNA POLYMERASE SUBUNIT BETA ; X-RAY DIFFRACTION 3.35Å

e4oinC6[C:992-1118] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed,

DNA-DIRECTED RNA POLYMERASE SUBUNIT BETA ; X-RAY DIFFRACTION 2.8Å

e4oioC6[C:992-1118] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed,

DNA-DIRECTED RNA POLYMERASE SUBUNIT BETA ; ligands: ATP ; X-RAY DIFFRACTION 3.1Å

e4oipC6[C:992-1118] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed,

DNA-DIRECTED RNA POLYMERASE SUBUNIT BETA ; X-RAY DIFFRACTION 3.4Å

e4oiqC6[C:992-1118] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed,

DNA-DIRECTED RNA POLYMERASE SUBUNIT BETA ; X-RAY DIFFRACTION 3.62Å

e4oirC6[C:992-1118] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed,

DNA-DIRECTED RNA POLYMERASE SUBUNIT BETA ; X-RAY DIFFRACTION 3.1Å

e4mexC2[C:1238-1342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE SUBUNIT BETA ; X-RAY DIFFRACTION 3.9Å

e4mexI2[I:1238-1342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE SUBUNIT BETA ; X-RAY DIFFRACTION 3.9Å

e4meyC2[C:1238-1342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase subunit beta ; X-RAY DIFFRACTION 3.90Å

e4meyI2[I:1238-1342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase subunit beta ; X-RAY DIFFRACTION 3.90Å

e4q5sC6[C:992-1118] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase subunit beta ; X-RAY DIFFRACTION 3.0Å

e4q4zC6[C:992-1118] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase subunit beta ; ligands: ATP ; X-RAY DIFFRACTION 2.85Å

e4igcH2[H:1238-1342] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e4jk1H2[H:1238-1342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Escherichia coli RNA polymerase beta subunit ; X-RAY DIFFRACTION 3.9Å

e4jk2H2[H:1238-1342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ESCHERICHIA COLI RNA POLYMERASE BETA SUBUNIT ; X-RAY DIFFRACTION 4.2Å

e1i3qB1[B:1098-1224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE II 140KD POLYPEPTIDE ; ligands: ZN ; X-RAY DIFFRACTION 3.1Å

e3i4mB1[B:1098-1224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE II SUBUNIT RPB2 ; ligands: ZN ; X-RAY DIFFRACTION 3.7Å

e3i4nB1[B:1098-1224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE II SUBUNIT RPB2 ; ligands: ZN ; X-RAY DIFFRACTION 3.9Å

e1i50B1[B:1098-1224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE II 140KD POLYPEPTIDE ; ligands: ZN ; X-RAY DIFFRACTION 2.8Å

e1k83B1[B:1098-1224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE II 140KD POLYPEPTIDE ; ligands: ZN ; X-RAY DIFFRACTION 2.8Å

e2nvyB1[B:1098-1224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE II 140 KDA POLYPEPTIDE ; ligands: ZN ; X-RAY DIFFRACTION 3.4Å

e1twaB1[B:1098-1224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE II 140 KDA POLYPEPTIDE ; ligands: ZN ; X-RAY DIFFRACTION 3.2Å

e1twcB1[B:1098-1224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE II 140 KDA POLYPEPTIDE ; ligands: ZN ; X-RAY DIFFRACTION 3.0Å

e1twgB1[B:1098-1224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE II 140 KDA POLYPEPTIDE ; ligands: ZN ; X-RAY DIFFRACTION 3.3Å

e1twhB1[B:1098-1224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE II 140 KDA POLYPEPTIDE ; ligands: ZN ; X-RAY DIFFRACTION 3.4Å

e4igcC4[C:1238-1342] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e4jk1C2[C:1238-1342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Escherichia coli RNA polymerase beta subunit ; X-RAY DIFFRACTION 3.9Å

e4jk2C2[C:1238-1342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ESCHERICHIA COLI RNA POLYMERASE BETA SUBUNIT ; X-RAY DIFFRACTION 4.2Å

e4jkrC3[C:1238-1342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase subunit beta ; X-RAY DIFFRACTION 4.20Å

e3lu0C4[C:1238-1342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase subunit beta ; ELECTRON MICROSCOPY

e2e2jB1[B:1098-1222] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase II 140 kDa polypeptide ; ligands: ZN ; X-RAY DIFFRACTION 3.5Å

e3fkiB1[B:1098-1224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE II SUBUNIT RPB2 ; ligands: ZN ; X-RAY DIFFRACTION 3.88Å

e3gtgB1[B:1098-1220] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase II subunit RPB2 ; ligands: ZN ; X-RAY DIFFRACTION 3.78Å

e3gtjB1[B:1098-1220] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase II subunit RPB2 ; ligands: ZN ; X-RAY DIFFRACTION 3.40Å

e3gtkB1[B:1098-1220] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase II subunit RPB2 ; ligands: ZN ; X-RAY DIFFRACTION 3.80Å

e3hozB1[B:1098-1224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE II SUBUNIT RPB2 ; ligands: ZN ; X-RAY DIFFRACTION 3.65Å

e4wqsC5[C:999-1119] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase subunit beta ; X-RAY DIFFRACTION 4.300Å

e4yfkC4[C:1238-1342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase subunit beta ; ligands: 4C6 ; X-RAY DIFFRACTION 3.5Å

e1hqmC6[C:1000-1115] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase subunit beta ; X-RAY DIFFRACTION 3.2Å

e1l9uC5[C:1000-1116] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RNA POLYMERASE, BETA SUBUNIT ; X-RAY DIFFRACTION 4Å

e1l9uL4[L:1000-1116] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RNA POLYMERASE, BETA SUBUNIT ; X-RAY DIFFRACTION 4Å

e1l9zC7[C:1000-1116] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RNA POLYMERASE, BETA SUBUNIT ; X-RAY DIFFRACTION 6.5Å

e2nvqB6[B:1098-1224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase II 140 kDa polypeptide ; ligands: ZN ; X-RAY DIFFRACTION 2.90Å

e2nvtB6[B:1098-1224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE II 140 KDA POLYPEPTIDE ; ligands: ZN ; X-RAY DIFFRACTION 3.36Å

e3rzdB1[B:1098-1224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase II subunit RPB2 ; ligands: ZN ; X-RAY DIFFRACTION 3.300Å

e3rzoB3[B:1098-1224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase II subunit RPB2 ; ligands: ZN ; X-RAY DIFFRACTION 3.000Å

e3s14B3[B:1098-1224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase II subunit RPB2 ; ligands: ZN ; X-RAY DIFFRACTION 2.850Å

e3s15B6[B:1098-1224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase II subunit RPB2 ; ligands: ZN ; X-RAY DIFFRACTION 3.300Å

e3s16B4[B:1098-1224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE II SUBUNIT RPB2 ; ligands: ZN ; X-RAY DIFFRACTION 3.24Å

e3s17B4[B:1098-1224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase II subunit RPB2 ; ligands: ZN ; X-RAY DIFFRACTION 3.200Å

e3s1mB5[B:1098-1224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase II subunit RPB2 ; ligands: ZN ; X-RAY DIFFRACTION 3.130Å

e3s1nB6[B:1098-1224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase II subunit RPB2 ; ligands: ZN ; X-RAY DIFFRACTION 3.100Å

e3s1qB3[B:1098-1224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase II subunit RPB2 ; ligands: ZN ; X-RAY DIFFRACTION 3.300Å

e3s1rB3[B:1098-1224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase II subunit RPB2 ; ligands: ZN ; X-RAY DIFFRACTION 3.200Å

e3s2dB2[B:1098-1224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase II subunit RPB2 ; ligands: ZN ; X-RAY DIFFRACTION 3.200Å

e3s2hB7[B:1098-1224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase II subunit RPB2 ; ligands: ZN ; X-RAY DIFFRACTION 3.300Å

e2yu9B1[B:1098-1224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase II 140 kDa polypeptide ; ligands: ZN ; X-RAY DIFFRACTION 3.400Å

e4yg2C1[C:1238-1342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase subunit beta ; X-RAY DIFFRACTION 3.6Å

e4ylnC2[C:1240-1342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase subunit beta ; X-RAY DIFFRACTION 5.5Å

e4ylnI4[I:1240-1342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase subunit beta ; X-RAY DIFFRACTION 5.5Å

e4ylnO4[O:1240-1342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase subunit beta ; X-RAY DIFFRACTION 5.5Å

e4yloC3[C:1240-1342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase subunit beta ; X-RAY DIFFRACTION 6.0Å

e4yloI7[I:1240-1342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase subunit beta ; X-RAY DIFFRACTION 6.0Å

e4yloO10[O:1240-1342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase subunit beta ; X-RAY DIFFRACTION 6.0Å

e4ylpC3[C:1240-1342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase subunit beta ; X-RAY DIFFRACTION 5.5Å

e4ylpI10[I:1240-1342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase subunit beta ; X-RAY DIFFRACTION 5.5Å

e4ylpO10[O:1240-1342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase subunit beta ; X-RAY DIFFRACTION 5.5Å

e4y52B3[B:1098-1221] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase II subunit RPB2 ; ligands: ZN ; X-RAY DIFFRACTION 3.500Å

e4y7nB1[B:1098-1221] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase II subunit RPB2,DNA-directed RNA polymerase II subunit RPB2 ; ligands: ZN ; X-RAY DIFFRACTION 3.300Å

e4xsxC3[C:1240-1342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase subunit beta ; X-RAY DIFFRACTION 3.700Å

e4xsyC8[C:1240-1342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase subunit beta ; X-RAY DIFFRACTION 4.000Å

e4xsyI6[I:1240-1342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase subunit beta ; X-RAY DIFFRACTION 4.000Å

e4xszC10[C:1240-1342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase subunit beta ; X-RAY DIFFRACTION 3.680Å

e4xszI8[I:1240-1342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase subunit beta ; X-RAY DIFFRACTION 3.680Å

e4zh2C7[C:1238-1342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase subunit beta ; X-RAY DIFFRACTION 4.200Å

e4zh2I7[I:1238-1342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase subunit beta ; X-RAY DIFFRACTION 4.200Å

e4zh3C4[C:1238-1342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase subunit beta ; X-RAY DIFFRACTION 4.100Å

e4zh3I7[I:1238-1342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase subunit beta ; X-RAY DIFFRACTION 4.100Å

e4zh4C3[C:1238-1342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase subunit beta ; X-RAY DIFFRACTION 4.000Å

e4zh4I1[I:1238-1342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase subunit beta ; X-RAY DIFFRACTION 4.000Å

e5c3eB7[B:1098-1224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase II subunit RPB2 ; ligands: ZN ; X-RAY DIFFRACTION 3.400Å

e5c44B2[B:1098-1224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase II subunit RPB2 ; X-RAY DIFFRACTION 3.852Å

e5c4aB7[B:1098-1223] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase II subunit RPB2 ; ligands: ZN ; X-RAY DIFFRACTION 4.2Å

e5c4jB2[B:1098-1224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase II subunit RPB2 ; ligands: ZN ; X-RAY DIFFRACTION 4.0Å

e5c4xB7[B:1098-1224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase II subunit RPB2 ; ligands: ZN ; X-RAY DIFFRACTION 4.0Å

e5byhC9[C:1240-1341] Image Pymol Jmol Links: PDB, SCOP, CATH

e4ym7AB7[AB:1041-1203] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase I subunit RPA135 ; ligands: ZN ; X-RAY DIFFRACTION 5.5Å

e4ym7BB5[BB:1041-1203] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase I subunit RPA135 ; ligands: ZN ; X-RAY DIFFRACTION 5.5Å

e4ym7CB4[CB:1041-1203] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase I subunit RPA135 ; ligands: ZN ; X-RAY DIFFRACTION 5.5Å

e4ym7DB5[DB:1041-1203] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase I subunit RPA135 ; ligands: ZN ; X-RAY DIFFRACTION 5.5Å

e4ym7EB5[EB:1041-1203] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase I subunit RPA135 ; ligands: ZN ; X-RAY DIFFRACTION 5.5Å

e4ym7FB7[FB:1041-1203] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase I subunit RPA135 ; ligands: ZN ; X-RAY DIFFRACTION 5.5Å

e4xlnC6[C:999-1118] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase subunit beta ; X-RAY DIFFRACTION 4.000Å

e4xlnI1[I:999-1118] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase subunit beta ; X-RAY DIFFRACTION 4.000Å

e4xlpC2[C:999-1118] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase subunit beta ; X-RAY DIFFRACTION 4.000Å

e4xlpI6[I:999-1118] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase subunit beta ; X-RAY DIFFRACTION 4.000Å

e4xlqC1[C:999-1118] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase subunit beta ; X-RAY DIFFRACTION 4.500Å

e4xlqI3[I:999-1118] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase subunit beta ; X-RAY DIFFRACTION 4.500Å

e4xlrC6[C:999-1118] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase subunit beta ; X-RAY DIFFRACTION 4.150Å

e4xlrI3[I:999-1118] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase subunit beta ; X-RAY DIFFRACTION 4.150Å

e4xlsC4[C:999-1118] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase subunit beta ; X-RAY DIFFRACTION 4.01Å

e4xlsI5[I:999-1118] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase subunit beta ; X-RAY DIFFRACTION 4.01Å

e5fmfB1[B:1098-1224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE II SUBUNIT RPB2 ; ligands: ZN ; ELECTRON MICROSCOPY

e5fj8B1[B:1030-1149] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE III SUBUNIT RPC2 ; ligands: ZN ; ELECTRON MICROSCOPY

e5fj9B4[B:1030-1149] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE III SUBUNIT RPC2 ; ligands: ZN ; ELECTRON MICROSCOPY

e5fjaB2[B:1030-1149] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE III SUBUNIT RPC2 ; ligands: ZN ; ELECTRON MICROSCOPY

e5ezkC5[C:1240-1342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase subunit beta ; X-RAY DIFFRACTION 8.500Å

Next

e4c2mB7[B:1041-1203] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE I SUBUNIT RPA135 ; ligands: ZN ; X-RAY DIFFRACTION 2.80Å

e4by7B7[B:1098-1224] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE II SUBUNIT RPB2 ; ligands: ZN ; X-RAY DIFFRACTION 3.15Å

e2e2iB13[B:1098-1224] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE II 140 KDA POLYPEPTIDE ; ligands: ZN ; X-RAY DIFFRACTION 3.41Å

e4kmuC8[C:1240-1342] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE SUBUNIT BETA ; X-RAY DIFFRACTION 3.85Å

e4s20C6[C:1238-1342] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase subunit beta ; X-RAY DIFFRACTION 4.7Å

a+b duplicates or obligate multimersalpha and beta duplicates or monomers associated together to form a compact domain

a/b barrelsrepeating beta-alpha units form a barrel

a/b three-layered sandwichesrepeating beta-alpha units form a sandwich with a mainly parallel beta-sheet layer stacked between two alpha-helix layers

mixed a+b and a/balpha and beta domain consists of both a+b and a/b regions

few secondary structure elementsstabilized by cofactors or disulfides

extended segmentsextended, non-globular segments, frequently bind to other proteins to form complexes