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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

X: P-loop domains-like
H: P-loop domains-related
T: P-loop containing nucleoside triphosphate hydrolases
F: Helicase_C

PF00271 CL0023

Representatives:

e1fukA1[A:233-394] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

EUKARYOTIC INITIATION FACTOR 4A ; ligands: ZN ; X-RAY DIFFRACTION 1.75Å

e1yksA3[A:325-484] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Genome polyprotein [contains: Flavivirin protease NS3 catalytic subunit] ; X-RAY DIFFRACTION 1.8Å

e1t5iA1[A:261-428] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

C_TERMINAL DOMAIN OF A PROBABLE ATP-DEPENDENT RNA HELICASE ; X-RAY DIFFRACTION 1.9Å

e3jcrF2[F:639-806] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

hPrp28 ; ELECTRON MICROSCOPY

e7apkH1[H:256-425] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Spliceosome RNA helicase DDX39B ; ELECTRON MICROSCOPY

e7apkP1[P:256-425] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Spliceosome RNA helicase DDX39B ; ELECTRON MICROSCOPY

e7apkh1[h:256-425] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Spliceosome RNA helicase DDX39B ; ELECTRON MICROSCOPY

e7apkp1[p:256-425] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Spliceosome RNA helicase DDX39B ; ELECTRON MICROSCOPY

e7znkH1[H:256-425] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Spliceosome RNA helicase DDX39B ; ELECTRON MICROSCOPY

e7znkh1[h:256-425] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Spliceosome RNA helicase DDX39B ; ELECTRON MICROSCOPY

e7znlH1[H:256-425] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Spliceosome RNA helicase DDX39B ; ELECTRON MICROSCOPY

e7znlP1[P:256-425] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Spliceosome RNA helicase DDX39B ; ELECTRON MICROSCOPY

e7znlh1[h:256-425] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Spliceosome RNA helicase DDX39B ; ELECTRON MICROSCOPY

e7znlp1[p:256-425] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Spliceosome RNA helicase DDX39B ; ELECTRON MICROSCOPY

e2xauA2[A:271-452] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PRE-MRNA-SPLICING FACTOR ATP-DEPENDENT RNA HELICASE PRP43 ; ligands: ACT,ADP,MG ; X-RAY DIFFRACTION 1.90Å

e5gn1A1[A:810-1124] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ATP-dependent helicase FUN30 ; X-RAY DIFFRACTION 1.95Å

e1z5zA1[A:663-906] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Helicase of the snf2/rad54 family ; X-RAY DIFFRACTION 2.0Å

e5aorA2[A:564-792] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DOSAGE COMPENSATION REGULATOR ; ligands: ADP,ALF ; X-RAY DIFFRACTION 2.08Å

e1s2mA2[A:252-422] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Putative ATP-dependent RNA helicase DHH1 ; X-RAY DIFFRACTION 2.1Å

e5gi4B1[B:218-374] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ATP-dependent RNA helicase DeaD ; X-RAY DIFFRACTION 2.244Å

e5ivlB2[B:212-369] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DEAD-box ATP-dependent RNA helicase CshA ; ligands: SO4 ; X-RAY DIFFRACTION 2.30Å

e4a4zA2[A:506-541,A:607-800] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ANTIVIRAL HELICASE SKI2 ; ligands: ANP,EDO ; X-RAY DIFFRACTION 2.40Å

e2fwrA2[A:257-456] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA repair protein RAD25 ; X-RAY DIFFRACTION 2.600Å

e4nl4H4[H:385-428,H:489-630] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Primosome assembly protein PriA ; ligands: ADP ; X-RAY DIFFRACTION 2.65Å

e4f91B6[B:683-886] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

U5 small nuclear ribonucleoprotein 200 kDa helicase ; X-RAY DIFFRACTION 2.69Å

e4f91B7[B:1521-1721] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

U5 small nuclear ribonucleoprotein 200 kDa helicase ; X-RAY DIFFRACTION 2.69Å

e4xqkA3[A:423-712] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

LlaBIII ; ligands: K ; X-RAY DIFFRACTION 2.7Å

e5lstA2[A:668-836,A:1062-1111] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ATP-dependent DNA helicase Q4 ; X-RAY DIFFRACTION 2.75Å

e5dcaA5[A:701-907] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Pre-mRNA-splicing helicase BRR2 ; X-RAY DIFFRACTION 2.8Å

e1wp9A4[A:201-212,A:339-486] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ATP-dependent RNA helicase, putative ; X-RAY DIFFRACTION 2.9Å

e2xgjA2[A:324-577] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ATP-DEPENDENT RNA HELICASE DOB1 ; ligands: ADP ; X-RAY DIFFRACTION 2.9Å

e5agaA2[A:289-513] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ligands: ANP,FLC ; X-RAY DIFFRACTION 2.90Å

e1hv8A2[A:211-365] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PUTATIVE ATP-DEPENDENT RNA HELICASE MJ0669 ; ligands: SO4 ; X-RAY DIFFRACTION 3.0Å

e2p6rA5[A:203-403] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

afUHEL308 HELICASE ; X-RAY DIFFRACTION 3.0Å

e4cbiD2[D:364-522] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

SERINE PROTEASE NS3 ; X-RAY DIFFRACTION 3.00Å

highly disordered

e2eyqA6[A:779-989] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription-repair coupling factor ; ligands: EPE ; X-RAY DIFFRACTION 3.2Å

e1gm5A5[A:550-755] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RECG ; X-RAY DIFFRACTION 3.24Å

e4a2wA4[A:456-467,A:608-794] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RETINOIC ACID INDUCIBLE PROTEIN I ; X-RAY DIFFRACTION 3.70Å

e4bujA2[A:505-798] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ANTIVIRAL HELICASE SKI2 ; ligands: SO4 ; X-RAY DIFFRACTION 3.70Å

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.

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