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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

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

X: Ribonuclease H-like
H: Ribonuclease H-like
T: Ribonuclease H-like
F: Arena_ncap_C

PF17290 CL0219

Representatives:

e3mwpA2[A:364-561] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Nucleoprotein ; ligands: ZN ; X-RAY DIFFRACTION 1.782Å

e4fvuA1[A:360-569] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Nucleoprotein ; ligands: MG,ZN ; X-RAY DIFFRACTION 2.9Å

e4gveA1[A:358-564] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

NUCLEOPROTEIN ; ligands: MG,ZN ; X-RAY DIFFRACTION 1.73Å

e4gv3A1[A:356-569] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Nucleoprotein ; ligands: MN,ZN ; X-RAY DIFFRACTION 1.68Å

e3mwpB2[B:364-561] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Nucleoprotein ; ligands: ZN ; X-RAY DIFFRACTION 1.782Å

e3mwpC2[C:364-561] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Nucleoprotein ; ligands: ZN ; X-RAY DIFFRACTION 1.782Å

e3mx2A2[A:364-561] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

NUCLEOPROTEIN ; ligands: ZN ; X-RAY DIFFRACTION 1.98Å

e3mx2B2[B:364-561] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

NUCLEOPROTEIN ; ligands: ZN ; X-RAY DIFFRACTION 1.98Å

e3mx2C2[C:364-561] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

NUCLEOPROTEIN ; ligands: ZN ; X-RAY DIFFRACTION 1.98Å

e3mx5A2[A:364-561] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

NUCLEOPROTEIN ; ligands: ZN ; X-RAY DIFFRACTION 1.9Å

e3mx5B2[B:364-561] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

NUCLEOPROTEIN ; ligands: ZN ; X-RAY DIFFRACTION 1.9Å

e3mx5C2[C:364-561] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

NUCLEOPROTEIN ; ligands: ZN ; X-RAY DIFFRACTION 1.9Å

e3r3lA2[A:364-561] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Nucleoprotein ; ligands: MN,ZN ; X-RAY DIFFRACTION 2.44Å

e3r3lB2[B:364-561] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Nucleoprotein ; ligands: MN,ZN ; X-RAY DIFFRACTION 2.44Å

e3r3lC2[C:364-561] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Nucleoprotein ; ligands: MN,ZN ; X-RAY DIFFRACTION 2.44Å

e3q7bA1[A:360-569] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Nucleoprotein ; ligands: PO4,ZN ; X-RAY DIFFRACTION 1.7Å

e3q7cA1[A:360-569] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Nucleoprotein ; ligands: MN,PO4,ZN ; X-RAY DIFFRACTION 1.5Å

e4g9zA1[A:357-569] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Nucleoprotein ; ligands: ZN ; X-RAY DIFFRACTION 1.99Å

e4gv6A1[A:356-562] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Nucleoprotein ; ligands: MN,ZN ; X-RAY DIFFRACTION 1.98Å

e4gv9A1[A:357-554] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Nucleoprotein ; ligands: MN,ZN ; X-RAY DIFFRACTION 2.46Å

e4k7eA2[A:355-406,A:432-498,A:522-553] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

NUCLEOPROTEIN ; X-RAY DIFFRACTION 2.2Å

e4o6hA1[A:356-558] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

NUCLEOPROTEIN ; ligands: IMD,ZN ; X-RAY DIFFRACTION 2.8Å

e4o6hC1[C:356-558] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

NUCLEOPROTEIN ; ligands: K,MG,ZN ; X-RAY DIFFRACTION 2.8Å

e4o6hE1[E:356-558] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

NUCLEOPROTEIN ; ligands: IMD,ZN ; X-RAY DIFFRACTION 2.8Å

e4o6hF1[F:356-558] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

NUCLEOPROTEIN ; ligands: IMD,ZN ; X-RAY DIFFRACTION 2.8Å

e4o6hG1[G:356-558] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

NUCLEOPROTEIN ; ligands: K,MG,ZN ; X-RAY DIFFRACTION 2.8Å

e4o6hH1[H:356-558] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

NUCLEOPROTEIN ; ligands: K,MG,ZN ; X-RAY DIFFRACTION 2.8Å

e4o6iA1[A:357-558] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

NUCLEOPROTEIN ; ligands: IMD,MG,ZN ; X-RAY DIFFRACTION 2.0Å

e4o6hB1[B:355-558] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

NUCLEOPROTEIN ; ligands: IMD,ZN ; X-RAY DIFFRACTION 2.8Å

e4o6hD1[D:355-558] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

NUCLEOPROTEIN ; ligands: K,MG,ZN ; X-RAY DIFFRACTION 2.8Å

e4o6iB1[B:355-558] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

NUCLEOPROTEIN ; ligands: IMD,MG,ZN ; X-RAY DIFFRACTION 2.0Å

e3mwtA1[A:364-561] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

NUCLEOPROTEIN ; ligands: MN,ZN ; X-RAY DIFFRACTION 1.98Å

e3mwtB2[B:364-561] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

NUCLEOPROTEIN ; ligands: MN,ZN ; X-RAY DIFFRACTION 1.98Å

e3mwtC2[C:364-561] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

NUCLEOPROTEIN ; ligands: MN,ZN ; X-RAY DIFFRACTION 1.98Å

e5lrpA1[A:365-570] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Nucleoprotein ; ligands: MG,ZN ; X-RAY DIFFRACTION 1.941Å

e5lrpB1[B:365-570] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Nucleoprotein ; ligands: MG,ZN ; X-RAY DIFFRACTION 1.941Å

e5ls4A1[A:365-570] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Nucleoprotein ; ligands: CA,PEG,ZN ; X-RAY DIFFRACTION 1.469Å

e6t2aA1[A:365-570] Image Pymol Jmol Links: PDB, SCOP, CATHDOI

Nucleoprotein ; ligands: MN,PEG,ZN ; X-RAY DIFFRACTION 1.758Å

e6t2aB1[B:366-570] Image Pymol Jmol Links: PDB, SCOP, CATHDOI

Nucleoprotein ; ligands: MN,ZN ; X-RAY DIFFRACTION 1.758Å

e6sx8A1[A:365-570] Image Pymol Jmol Links: PDB, SCOP, CATHDOI

Nucleoprotein ; ligands: MN,ZN ; X-RAY DIFFRACTION 1.790Å

e6sx8B1[B:365-570] Image Pymol Jmol Links: PDB, SCOP, CATHDOI

Nucleoprotein ; ligands: MN,ZN ; X-RAY DIFFRACTION 1.790Å

e6sy8A1[A:365-570] Image Pymol Jmol Links: PDB, SCOP, CATHDOI

Nucleoprotein ; ligands: ZN ; X-RAY DIFFRACTION 2.080Å

e6sy8B1[B:365-570] Image Pymol Jmol Links: PDB, SCOP, CATHDOI

Nucleoprotein ; ligands: ZN ; X-RAY DIFFRACTION 2.080Å

e6t6lA1[A:365-570] Image Pymol Jmol Links: PDB, SCOP, CATHDOI

Nucleoprotein ; ligands: MN,ZN ; X-RAY DIFFRACTION 1.757Å

e6t6lB1[B:365-570] Image Pymol Jmol Links: PDB, SCOP, CATHDOI

Nucleoprotein ; ligands: MN,ZN ; X-RAY DIFFRACTION 1.757Å

e6t6lC1[C:366-570] Image Pymol Jmol Links: PDB, SCOP, CATHDOI

Nucleoprotein ; ligands: MN,ZN ; X-RAY DIFFRACTION 1.757Å

e7v37A1[A:364-569] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Nucleoprotein ; ligands: ZN ; X-RAY DIFFRACTION 2.400Å

e7v37B1[B:364-569] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Nucleoprotein ; ligands: ZN ; X-RAY DIFFRACTION 2.400Å

e7v38A1[A:363-569] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Nucleoprotein ; ligands: PMB,ZN ; X-RAY DIFFRACTION 2.400Å

e7v38B1[B:363-569] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Nucleoprotein ; ligands: PMB,ZN ; X-RAY DIFFRACTION 2.400Å

e7v39A1[A:363-569] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Nucleoprotein ; ligands: HGB,ZN ; X-RAY DIFFRACTION 2.200Å

e7v39B1[B:361-569] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Nucleoprotein ; ligands: HGB,ZN ; X-RAY DIFFRACTION 2.200Å

e7v3aA1[A:363-569] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Nucleoprotein ; ligands: MG,ZN ; X-RAY DIFFRACTION 2.100Å

e7v3aB1[B:363-569] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Nucleoprotein ; ligands: MG,ZN ; X-RAY DIFFRACTION 2.100Å

e7v3bA1[A:363-569] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Nucleoprotein ; ligands: MG,PMB,ZN ; X-RAY DIFFRACTION 1.7950Å

e7v3bB1[B:363-569] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Nucleoprotein ; ligands: MG,ZN ; X-RAY DIFFRACTION 1.7950Å

e7v3cA1[A:363-569] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Nucleoprotein ; ligands: MG,ZN ; X-RAY DIFFRACTION 1.8960Å

e7v3cB1[B:363-569] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Nucleoprotein ; ligands: HGB,MG,ZN ; X-RAY DIFFRACTION 1.8960Å

F: Unmapped domains

Pseudo group of domains that do not map to PFam family profiles. Domains inside should not be considered as in one family.

few secondary structure elementsstabilized by cofactors or disulfides

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