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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: YqgF

PF14639 CL0580

Representatives:

e8oeuS1[S:757-944] * nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ELECTRON MICROSCOPY

e8of0S4[S:778-944] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ELECTRON MICROSCOPY

e3psiA25[A:737-906] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

TRANSCRIPTION ELONGATION FACTOR SPT6 ; X-RAY DIFFRACTION 3.3Å

e3psfA2[A:737-906] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription elongation factor SPT6 ; X-RAY DIFFRACTION 2.59Å

e6gmhM2[M:757-944] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription elongation factor SPT6,Transcription elongation factor SPT6,Transcription elongation factor SPT6 ; ELECTRON MICROSCOPY

e6tedM8[M:757-944] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription elongation factor SPT6 ; ELECTRON MICROSCOPY

e7opcM1[M:757-944] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription elongation factor SPT6 ; ELECTRON MICROSCOPY

e7oopM2[M:757-944] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription elongation factor SPT6 ; ELECTRON MICROSCOPY

e7opdM3[M:757-944] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription elongation factor SPT6 ; ELECTRON MICROSCOPY

e7o6bA3[A:737-906] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription elongation factor SPT6 ; ELECTRON MICROSCOPY

e7uncM6[M:757-944] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription elongation factor SPT6 ; ELECTRON MICROSCOPY

e7undM4[M:757-944] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription elongation factor SPT6 ; ELECTRON MICROSCOPY

e8oevS2[S:757-944] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ELECTRON MICROSCOPY

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