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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

X: cradle loop barrel

Refs: Structure 14, 1489-1498; Current opinion in structural biology 18, 358-365

X: OB-fold
H: Nucleic acid-binding proteins
T: Nucleic acid-binding proteins

54123, 3-crossover-4

F: Spt6_S1

PF21710 CL0021

Representatives:

e3psiA7[A:1114-1210] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

TRANSCRIPTION ELONGATION FACTOR SPT6 ; X-RAY DIFFRACTION 3.3Å

e7o6bA1[A:1114-1211] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription elongation factor SPT6 ; ELECTRON MICROSCOPY

e8of0S7[S:1145-1175,S:1226-1282] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ELECTRON MICROSCOPY

e8oeuS7[S:1145-1175,S:1226-1288] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ELECTRON MICROSCOPY

e6gmhM6[M:1145-1176,M:1226-1287] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

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

e6tedM3[M:1145-1176,M:1226-1287] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription elongation factor SPT6 ; ELECTRON MICROSCOPY

e7opcM7[M:1145-1175,M:1226-1287] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription elongation factor SPT6 ; ELECTRON MICROSCOPY

e7oopM7[M:1145-1175,M:1226-1287] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription elongation factor SPT6 ; ELECTRON MICROSCOPY

e7opdM7[M:1145-1175,M:1226-1287] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription elongation factor SPT6 ; ELECTRON MICROSCOPY

e7uncM9[M:1145-1176,M:1226-1287] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription elongation factor SPT6 ; ELECTRON MICROSCOPY

e7undM7[M:1145-1176,M:1226-1287] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription elongation factor SPT6 ; ELECTRON MICROSCOPY

e8oevS6[S:1145-1175,S:1226-1288] 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.

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

few secondary structure elementsstabilized by cofactors or disulfides

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