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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

X: HhH/H2TH
H: SAM/DNA-glycosylase
T: SAM domain-like
F: HHH_9

PF17674 CL0198

Representatives:

e3bzkA4[A:564-636] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Tex ; X-RAY DIFFRACTION 2.30Å

e3psiA6[A:1002-1113] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

TRANSCRIPTION ELONGATION FACTOR SPT6 ; X-RAY DIFFRACTION 3.3Å

e8oeuS6[S:1043-1144] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ELECTRON MICROSCOPY

e8of0S2[S:1043-1144] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ELECTRON MICROSCOPY

e3psfA4[A:1002-1114] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription elongation factor SPT6 ; X-RAY DIFFRACTION 2.59Å

e6gmhM3[M:1048-1144] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

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

e6tedM7[M:1040-1144] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription elongation factor SPT6 ; ELECTRON MICROSCOPY

e7opcM2[M:1043-1144] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription elongation factor SPT6 ; ELECTRON MICROSCOPY

e7oopM5[M:1043-1144] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription elongation factor SPT6 ; ELECTRON MICROSCOPY

e7opdM6[M:1043-1144] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription elongation factor SPT6 ; ELECTRON MICROSCOPY

e7o6bA2[A:1002-1113] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription elongation factor SPT6 ; ELECTRON MICROSCOPY

e7uncM7[M:1040-1144] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription elongation factor SPT6 ; ELECTRON MICROSCOPY

e7undM8[M:1040-1144] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription elongation factor SPT6 ; ELECTRON MICROSCOPY

e8oevS4[S:1040-1144] 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.

T: PAP/OAS1 substrate-binding domain

the fourth helix changed to strands

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

few secondary structure elementsstabilized by cofactors or disulfides

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