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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

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

e5ip7B3[B:1098-1224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase II subunit RPB2 ; ligands: ZN ; X-RAY DIFFRACTION 3.520Å

e5ip9B3[B:1098-1224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase II subunit RPB2 ; ligands: ZN ; X-RAY DIFFRACTION 3.450Å

e4a3bB4[B:1098-1224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE II SUBUNIT RPB2 ; ligands: ZN ; X-RAY DIFFRACTION 3.50Å

e4a3cB5[B:1098-1224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE II SUBUNIT RPB2 ; ligands: ZN ; X-RAY DIFFRACTION 3.50Å

e4a3dB1[B:1098-1224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE II SUBUNIT RPB2 ; ligands: ZN ; X-RAY DIFFRACTION 3.40Å

e4a3eB3[B:1098-1224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE II SUBUNIT RPB2 ; ligands: ZN ; X-RAY DIFFRACTION 3.40Å

e4a3fB5[B:1098-1224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE II SUBUNIT RPB2 ; ligands: ZN ; X-RAY DIFFRACTION 3.50Å

e4a3gB7[B:1098-1224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE II SUBUNIT RPB2 ; ligands: ZN ; X-RAY DIFFRACTION 3.50Å

e4a3iB5[B:1098-1224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE II SUBUNIT RPB2 ; ligands: ZN ; X-RAY DIFFRACTION 3.80Å

e4a3jB4[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

e4a3kB2[B:1098-1224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE II SUBUNIT RPB2 ; ligands: ZN ; X-RAY DIFFRACTION 3.50Å

e4a3lB2[B:1098-1224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE II SUBUNIT RPB2 ; ligands: ZN ; X-RAY DIFFRACTION 3.50Å

e4a3mB1[B:1098-1224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE II SUBUNIT RPB2 ; ligands: ZN ; X-RAY DIFFRACTION 3.90Å

e4a93B5[B:1098-1224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE II SUBUNIT RPB2 ; ligands: ZN ; X-RAY DIFFRACTION 3.40Å

e2b63B6[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 3.8Å

e2b8kB1[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 4.15Å

e4bxxB1[B:1098-1224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE II SUBUNIT RPB2 ; ligands: ZN ; X-RAY DIFFRACTION 3.28Å

e4bxzB5[B:1098-1224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE II SUBUNIT RPB2 ; ligands: ZN ; X-RAY DIFFRACTION 4.80Å

e4by1B4[B:1098-1224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE II SUBUNIT RPB2 ; ligands: ZN ; X-RAY DIFFRACTION 3.60Å

e3gtlB4[B:1098-1224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase II subunit RPB2 ; ligands: ZN ; X-RAY DIFFRACTION 3.38Å

e3gtmB7[B:1098-1224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

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

e3gtoB7[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

e3gtpB3[B:1098-1224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase II subunit RPB2 ; ligands: ZN ; X-RAY DIFFRACTION 3.90Å

e3gtqB6[B:1098-1224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

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

e3h3vC1[C:1098-1224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase II subunit RPB2 ; ligands: ZN ; X-RAY DIFFRACTION 4.000Å

e3houB3[B:1098-1224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE II SUBUNIT RPB2 ; ligands: ZN ; X-RAY DIFFRACTION 3.2Å

e3houN6[N:1098-1224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE II SUBUNIT RPB2 ; ligands: ZN ; X-RAY DIFFRACTION 3.2Å

e3hovB7[B:1098-1224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE II SUBUNIT RPB2 ; ligands: ZN ; X-RAY DIFFRACTION 3.5Å

e3howB7[B:1098-1224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE II SUBUNIT RPB2 ; ligands: ZN ; X-RAY DIFFRACTION 3.6Å

e3hoxB2[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

e1i6hB7[B:1098-1224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

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

e3j0kB7[B:1098-1224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase II 140 kDa polypeptide ; ligands: ZN ; ELECTRON MICROSCOPY

e3j1nB3[B:1098-1224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase II subunit RPB2 ; ELECTRON MICROSCOPY

e2ja5B2[B:1098-1224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase II subunit RPB2 ; ligands: ZN ; X-RAY DIFFRACTION 3.800Å

e2ja6B7[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 4.00Å

e2ja7B3[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 3.80Å

e2ja7N2[N:1098-1224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE II 140 KDA POLYPEPTIDE ; ligands: ZN ; X-RAY DIFFRACTION 3.80Å

e2ja8B7[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 3.80Å

e3k1fB3[B:1098-1224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE II SUBUNIT RPB2 ; ligands: ZN ; X-RAY DIFFRACTION 4.3Å

e3k7aB2[B:1098-1224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE II SUBUNIT RPB2 ; ligands: ZN ; X-RAY DIFFRACTION 3.8Å

e3m3yB5[B:1098-1224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE II SUBUNIT RPB2 ; ligands: ZN ; X-RAY DIFFRACTION 3.18Å

e3m4oB5[B:1098-1224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE II SUBUNIT RPB2 ; ligands: ZN ; X-RAY DIFFRACTION 3.57Å

e1nikB3[B:1098-1224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ORF YOR151c ; ligands: ZN ; X-RAY DIFFRACTION 4.100Å

e1nt9B6[B:1098-1224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED POLYMERASE II SECOND LARGEST SUBUNIT ; X-RAY DIFFRACTION 4.2Å

e3po2B7[B:1098-1224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase II subunit RPB2 ; ligands: ZN ; X-RAY DIFFRACTION 3.3Å

e3po3B6[B:1098-1224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase II subunit RPB2 ; ligands: ACT,EPE,ZN ; X-RAY DIFFRACTION 3.3Å

e1pqvB3[B:1098-1224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase II 140 kDa polypeptide ; X-RAY DIFFRACTION 3.80Å

e3qt1B7[B:1098-1224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase II subunit RPB2 ; ligands: ZN ; X-RAY DIFFRACTION 4.3Å

e1r5uB1[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 4.5Å

e2r7zB4[B:1098-1224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

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

e1r9sB2[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 4.25Å

e1r9tB4[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 3.5Å

e2r92B6[B:1098-1224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase II subunit RPB2 ; ligands: ZN ; X-RAY DIFFRACTION 3.800Å

e2r93B6[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

e1sfoB3[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 3.61Å

e2vumB3[B:1098-1224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE II SUBUNIT RPB2 ; ligands: ZN ; X-RAY DIFFRACTION 3.40Å

e1wcmB7[B:1098-1224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE II SECOND LARGEST SUBUNIT ; ligands: ZN ; X-RAY DIFFRACTION 3.8Å

e2y0sR3[R:999-1122] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE ; ligands: ZN ; X-RAY DIFFRACTION 3.79Å

e1y1vB4[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

e1y1wB4[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 4.0Å

e1y1yB5[B:1098-1224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase II 140 kDa polypeptide ; X-RAY DIFFRACTION 4Å

e1y77B7[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 4.5Å

e4x67B1[B:1098-1224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase II subunit RPB2 ; ligands: ZN ; X-RAY DIFFRACTION 4.100Å

e4x6aB2[B:1098-1222] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase II subunit RPB2 ; ligands: ZN ; X-RAY DIFFRACTION 3.950Å

e3hoyB4[B:1098-1224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE II SUBUNIT RPB2 ; ligands: ZN ; X-RAY DIFFRACTION 3.4Å

e2pmzB5[B:996-1119] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

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

e2pmzR5[R:996-1119] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

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

e4b1oB2[B:999-1125] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e4aybB1[B:999-1125] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE ; ligands: ZN ; X-RAY DIFFRACTION 3.20Å

e3hkzJ2[J:996-1119] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase subunit B ; ligands: ZN ; X-RAY DIFFRACTION 3.4Å

e3hkzB5[B:996-1119] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase subunit B ; ligands: ZN ; X-RAY DIFFRACTION 3.4Å

e4v8sAR6[AR:999-1125] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE ; ligands: ZN ; X-RAY DIFFRACTION 4.30Å

e4v8sBB1[BB:999-1125] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE ; ligands: ZN ; X-RAY DIFFRACTION 4.30Å

e4b1pR6[R:999-1125] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e3h0gN4[N:1087-1210] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase II subunit RPB2 ; ligands: ZN ; X-RAY DIFFRACTION 3.650Å

e3h0gB4[B:1087-1210] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase II subunit RPB2 ; ligands: ZN ; X-RAY DIFFRACTION 3.650Å

e2y0sB3[B:999-1122] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE ; ligands: ZN ; X-RAY DIFFRACTION 3.79Å

e2wb1R1[R:999-1122] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE RPO2 SUBUNIT ; ligands: ZN ; X-RAY DIFFRACTION 3.52Å

e2wb1B1[B:999-1122] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE RPO2 SUBUNIT ; ligands: ZN ; X-RAY DIFFRACTION 3.52Å

e2waqB4[B:999-1122] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE RPO2 SUBUNIT ; ligands: ZN ; X-RAY DIFFRACTION 3.35Å

e7okyB3[B:1131-1251] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase subunit beta ; ligands: ZN ; ELECTRON MICROSCOPY

e7ol0B3[B:1131-1251] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase subunit beta ; ligands: ZN ; ELECTRON MICROSCOPY

e7oqyB3[B:995-1120] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase subunit B ; ligands: ZN ; ELECTRON MICROSCOPY

e7fjiB3[B:1015-1132] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase III subunit RPC2 ; ligands: ZN ; ELECTRON MICROSCOPY

e7oobB3[B:1054-1174] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase subunit beta ; ligands: ZN ; ELECTRON MICROSCOPY

e7oopB3[B:1054-1174] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase subunit beta ; ligands: ZN ; ELECTRON MICROSCOPY

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