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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

few secondary structure elementsstabilized by cofactors or disulfides

X: Rubredoxin-like

binds one zinc with two CxxC motifs on two beta-hairpins

H: Rubredoxin-related
T: Rubredoxin-related
F: TF_Zn_Ribbon

PF08271 CL0167

Representatives:

e3k7aM1[M:17-66] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

TRANSCRIPTION INITIATION FACTOR IIB ; ligands: ZN ; X-RAY DIFFRACTION 3.8Å

e1dl6A1[A:2-59] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed,

TRANSCRIPTION FACTOR II B (TFIIB) ; ligands: ZN ; SOLUTION NMR

e1pftA1[A:1-50] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

TFIIB ; ligands: ZN ; SOLUTION NMR

e1rlyA1[A:2-59] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIB ; ligands: ZN ; SOLUTION NMR

e5fmfR2[R:119-160] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

TRANSCRIPTION INITIATION FACTOR IIE SUBUNIT ALPHA, TFA1 ; ELECTRON MICROSCOPY

e5svah1[h:119-160] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIE subunit alpha ; ELECTRON MICROSCOPY

e1ro4A1[A:2-59] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIB ; SOLUTION NMR

e6gylW1[W:100-169] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIE subunit alpha,Tfa1,Tfa1 ; ligands: ZN ; ELECTRON MICROSCOPY

e4v1oM3[M:22-68] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

TRANSCRIPTION INITIATION FACTOR IIB ; ligands: ZN ; ELECTRON MICROSCOPY

e7ml0W1[W:100-169] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIE subunit alpha ; ligands: ZN ; ELECTRON MICROSCOPY

e5fmfP3[P:17-68] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

TRANSCRIPTION INITIATION FACTOR IIB, SUA7 ; ELECTRON MICROSCOPY

e5iy7M1[M:7-67] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIB ; ligands: ZN ; ELECTRON MICROSCOPY

e7ml1W2[W:100-169] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIE subunit alpha ; ligands: ZN ; ELECTRON MICROSCOPY

e7ml2W2[W:100-169] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIE subunit alpha ; ligands: ZN ; ELECTRON MICROSCOPY

e5iy8M1[M:7-67] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIB ; ligands: ZN ; ELECTRON MICROSCOPY

e5iy9M3[M:7-67] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIB ; ligands: ZN ; ELECTRON MICROSCOPY

e7ml4W2[W:100-169] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIE subunit alpha ; ligands: ZN ; ELECTRON MICROSCOPY

e5iybM1[M:7-67] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIB ; ligands: ZN ; ELECTRON MICROSCOPY

e5iycM1[M:7-67] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIB ; ligands: ZN ; ELECTRON MICROSCOPY

e5iydM1[M:7-67] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIB ; ligands: ZN ; ELECTRON MICROSCOPY

e5iy7Q1[Q:104-204] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

General transcription factor IIE subunit 1 ; ligands: ZN ; ELECTRON MICROSCOPY

e5iy9Q1[Q:104-204] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

General transcription factor IIE subunit 1 ; ligands: ZN ; ELECTRON MICROSCOPY

e5iybQ1[Q:104-204] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

General transcription factor IIE subunit 1 ; ligands: ZN ; ELECTRON MICROSCOPY

e5iydQ2[Q:104-204] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

General transcription factor IIE subunit 1 ; ligands: ZN ; ELECTRON MICROSCOPY

e5gpyA2[A:104-196] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

General transcription factor IIE subunit 1 ; ligands: ZN ; X-RAY DIFFRACTION 2.10Å

e5oqjM1[M:16-68] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIB ; ligands: ZN ; ELECTRON MICROSCOPY

e5oqmM1[M:16-68] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIB ; ligands: ZN ; ELECTRON MICROSCOPY

e6gykM3[M:16-68] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIB ; ligands: ZN ; ELECTRON MICROSCOPY

e6gylM1[M:16-68] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIB ; ligands: ZN ; ELECTRON MICROSCOPY

e6gymM3[M:16-68] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIB ; ligands: ZN ; ELECTRON MICROSCOPY

e6o9lM1[M:7-67] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIB ; ligands: ZN ; ELECTRON MICROSCOPY

e7lbmO3[O:7-54] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIB ; ligands: ZN ; ELECTRON MICROSCOPY

e7lbmQ1[Q:104-201] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

General transcription factor IIE subunit 1 ; ligands: ZN ; ELECTRON MICROSCOPY

e7edxR1[R:13-49] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIB ; ligands: ZN ; ELECTRON MICROSCOPY

e7eg7R3[R:13-49] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIB ; ligands: ZN ; ELECTRON MICROSCOPY

e7eg8R2[R:13-51] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIB ; ligands: ZN ; ELECTRON MICROSCOPY

e7eg9R2[R:13-49] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIB ; ligands: ZN ; ELECTRON MICROSCOPY

e7egaR2[R:13-51] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIB ; ligands: ZN ; ELECTRON MICROSCOPY

e7egbR1[R:13-50] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIB ; ligands: ZN ; ELECTRON MICROSCOPY

e7nvrM3[M:14-54] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIB ; ligands: ZN ; ELECTRON MICROSCOPY

e7nvsM3[M:14-54] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIB ; ligands: ZN ; ELECTRON MICROSCOPY

e7nvtM2[M:14-54] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIB ; ligands: ZN ; ELECTRON MICROSCOPY

e7nvyM1[M:14-54] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIB ; ligands: ZN ; ELECTRON MICROSCOPY

e7nvzM3[M:14-54] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIB ; ligands: ZN ; ELECTRON MICROSCOPY

e7eg9U1[U:101-174] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

General transcription factor IIE subunit 1 ; ligands: ZN ; ELECTRON MICROSCOPY

e7egaU2[U:101-174] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

General transcription factor IIE subunit 1 ; ligands: ZN ; ELECTRON MICROSCOPY

e7egbU1[U:101-174] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

General transcription factor IIE subunit 1 ; ligands: ZN ; ELECTRON MICROSCOPY

e7nvuM2[M:14-67] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIB ; ligands: ZN ; ELECTRON MICROSCOPY

e7nw0M3[M:14-67] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIB ; ligands: ZN ; ELECTRON MICROSCOPY

e7nvrW1[W:104-196,W:274-288] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

General transcription factor IIE subunit 1 ; ligands: ZN ; ELECTRON MICROSCOPY

e7nvsW1[W:104-196] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

General transcription factor IIE subunit 1 ; ligands: ZN ; ELECTRON MICROSCOPY

e7nvtW1[W:104-196] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

General transcription factor IIE subunit 1 ; ligands: ZN ; ELECTRON MICROSCOPY

e7nvuW1[W:104-196] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

General transcription factor IIE subunit 1 ; ligands: ZN ; ELECTRON MICROSCOPY

e7nvyW1[W:104-196,W:274-288] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

General transcription factor IIE subunit 1 ; ligands: ZN ; ELECTRON MICROSCOPY

e7nvzW2[W:104-196,W:274-288] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

General transcription factor IIE subunit 1 ; ligands: ZN ; ELECTRON MICROSCOPY

e7nw0W1[W:104-196,W:274-288] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

General transcription factor IIE subunit 1 ; ligands: ZN ; ELECTRON MICROSCOPY

e7egcR2[R:13-50] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIB ; ligands: ZN ; ELECTRON MICROSCOPY

e7enaBA3[BA:11-53] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIB ; ligands: ZN ; ELECTRON MICROSCOPY

e7o4iM2[M:14-58] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIB ; ligands: ZN ; ELECTRON MICROSCOPY

e7o72M3[M:14-68] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIB ; ligands: ZN ; ELECTRON MICROSCOPY

e7egcU1[U:101-174] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

General transcription factor IIE subunit 1 ; ligands: ZN ; ELECTRON MICROSCOPY

e7enaEA2[EA:101-174] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

General transcription factor IIE subunit 1 ; ligands: ZN ; ELECTRON MICROSCOPY

e7encBA1[BA:13-51] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIB ; ligands: ZN ; ELECTRON MICROSCOPY

e7o4jM2[M:14-58] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIB ; ligands: ZN ; ELECTRON MICROSCOPY

e7o73M3[M:14-58] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIB ; ligands: ZN ; ELECTRON MICROSCOPY

e7o75M3[M:14-58] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIB ; ligands: ZN ; ELECTRON MICROSCOPY

e7encEA1[EA:104-203] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

General transcription factor IIE subunit 1 ; ligands: ZN ; ELECTRON MICROSCOPY

e7ml4M3[M:22-58,M:124-127] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIB ; ligands: ZN ; ELECTRON MICROSCOPY

e7ml0M3[M:16-68] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIB ; ligands: ZN ; ELECTRON MICROSCOPY

e7ml1M3[M:16-68] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIB ; ligands: ZN ; ELECTRON MICROSCOPY

e7ml2M2[M:16-68] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIB ; ligands: ZN ; ELECTRON MICROSCOPY

e8gxqBA1[BA:14-54] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIB ; ligands: ZN ; ELECTRON MICROSCOPY

e8gxsBA1[BA:14-54] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIB ; ligands: ZN ; ELECTRON MICROSCOPY

e7zwdM2[M:14-54] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIB ; ligands: ZN ; ELECTRON MICROSCOPY

e7zx7M3[M:14-54] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIB ; ligands: ZN ; ELECTRON MICROSCOPY

e7ui9M1[M:21-55] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIB ; ELECTRON MICROSCOPY

e7uifM1[M:21-55] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIB ; ELECTRON MICROSCOPY

e7uioAM1[AM:21-55] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIB ; ELECTRON MICROSCOPY

e7uioBM1[BM:21-55] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIB ; ELECTRON MICROSCOPY

e8ceoM2[M:14-58] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIB ; ligands: ZN ; ELECTRON MICROSCOPY

e7zs9M3[M:14-58] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIB ; ligands: ZN ; ELECTRON MICROSCOPY

e7zsaM1[M:14-58] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIB ; ligands: ZN ; ELECTRON MICROSCOPY

e7zsbM2[M:14-58] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIB ; ligands: ZN ; ELECTRON MICROSCOPY

e7zx8M2[M:14-67] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIB ; ligands: ZN ; ELECTRON MICROSCOPY

e8gxqEA2[EA:104-196] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

General transcription factor IIE subunit 1 ; ligands: ZN ; ELECTRON MICROSCOPY

e8gxsEA1[EA:104-196] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

General transcription factor IIE subunit 1 ; ligands: ZN ; ELECTRON MICROSCOPY

e8bvwM2[M:14-54] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIB ; ligands: ZN ; ELECTRON MICROSCOPY

e8byqM1[M:14-54] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIB ; ligands: ZN ; ELECTRON MICROSCOPY

e8bz1M3[M:14-54] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIB ; ligands: ZN ; ELECTRON MICROSCOPY

e8cenM3[M:14-58] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIB ; ligands: ZN ; ELECTRON MICROSCOPY

e8bvwW1[W:104-196,W:274-288] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

General transcription factor IIE subunit 1 ; ligands: ZN ; ELECTRON MICROSCOPY

e8byqW1[W:104-196] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

General transcription factor IIE subunit 1 ; ligands: ZN ; ELECTRON MICROSCOPY

e6cncR1[R:1-41] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription factor IIIB 70 kDa subunit,TATA-box-binding protein,Transcription factor IIIB 70 kDa subunit ; ligands: ZN ; ELECTRON MICROSCOPY

e6cndR2[R:1-41] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription factor IIIB 70 kDa subunit,TATA-box-binding protein,Transcription factor IIIB 70 kDa subunit ; ligands: ZN ; ELECTRON MICROSCOPY

e6cnfR2[R:1-41] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription factor IIIB 70 kDa subunit,TATA-box-binding protein,Transcription factor IIIB 70 kDa subunit ; ligands: ZN ; ELECTRON MICROSCOPY

e1vd4A1[A:113-174] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIE, alpha subunit ; ligands: ZN ; SOLUTION NMR

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: Hypothetical protein Ta0289-C

insertion in the CxxC motif

X: RING/U-box-like

binds two zincs. one in the same way as rubredoxin, probably related to rubredoxin. the other in a similar way as glucocorticoid receptor

X: Glucocorticoid receptor-like

binds zinc with one beta-hairpin and one helix, the helix binds DNA

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