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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

X: Transcription factor IIA (TFIIA), beta-barrel domain
H: Transcription factor IIA (TFIIA), beta-barrel domain
T: Transcription factor IIA (TFIIA), beta-barrel domain
F: TFIIA

PF03153

Representatives:

Domain assembly:

e1nh2C1[C:228-286] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIA large chain , X-RAY DIFFRACTION 1.9Å

e1nh2D1[D:55-121] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIA large chain , X-RAY DIFFRACTION 1.9Å

e1rm1C1[C:228-286] Image Pymol Jmol Links: PDB, SCOP, CATH

TRANSCRIPTION INITIATION FACTOR IIA LARGE CHAIN ; X-RAY DIFFRACTION 2.5Å

e5fmfM2[M:228-286] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RNA POLYMERASE II PRE-INITIATION COMPLEX, TOA1 ; ELECTRON MICROSCOPY

e5furC1[C:330-376] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

TRANSCRIPTION INITIATION FACTOR IIA SUBUNIT 1 ; ELECTRON MICROSCOPY

e5iy6N1[N:322-376] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIA subunit 1 ; ELECTRON MICROSCOPY

e5iy7N1[N:322-376] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIA subunit 1 ; ELECTRON MICROSCOPY

e5iy8N1[N:322-376] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIA subunit 1 ; ELECTRON MICROSCOPY

e5iy9N2[N:322-376] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIA subunit 1 ; ELECTRON MICROSCOPY

e5iyaN2[N:322-376] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIA subunit 1 ; ELECTRON MICROSCOPY

e5iybN1[N:322-376] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIA subunit 1 ; ELECTRON MICROSCOPY

e5iycN2[N:322-376] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIA subunit 1 ; ELECTRON MICROSCOPY

e5iydN1[N:322-376] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIA subunit 1 ; ELECTRON MICROSCOPY

e5fywU1[U:241-286] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

TRANSCRIPTION INITIATION FACTOR IIA LARGE SUBUNIT ; ELECTRON MICROSCOPY

e5fz5U1[U:241-286] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

TRANSCRIPTION INITIATION FACTOR IIA LARGE SUBUNIT ; ELECTRON MICROSCOPY

e5svad1[d:228-286] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIA large subunit ; ELECTRON MICROSCOPY

e5m4sA1[A:158-210] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIA subunit 2,Transcription initiation factor IIA subunit 1,Transcription initiation factor IIA subunit 1 ; X-RAY DIFFRACTION 2.38Å

e5oqjU1[U:241-286] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIA large subunit ; ELECTRON MICROSCOPY

e5oqmU1[U:241-286] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIA large subunit ; ELECTRON MICROSCOPY

e6mzmW1[W:330-376] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIA subunit 1 ; ELECTRON MICROSCOPY

e6gykU2[U:241-286] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIA large subunit,Transcription initiation factor IIA large subunit ; ELECTRON MICROSCOPY

e6gylU2[U:241-286] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIA large subunit,Transcription initiation factor IIA large subunit ; ELECTRON MICROSCOPY

e6gymU2[U:241-286] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIA large subunit,Transcription initiation factor IIA large subunit ; ELECTRON MICROSCOPY

e6o9lN2[N:322-376] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIA subunit 1 ; ELECTRON MICROSCOPY

e7lbmM1[M:322-376] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIA subunit 1 ; ELECTRON MICROSCOPY

e7edxQ1[Q:322-376] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIA subunit 1 ; ELECTRON MICROSCOPY

e7eg7Q2[Q:322-376] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIA subunit 1 ; ELECTRON MICROSCOPY

e7eg8Q2[Q:322-376] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIA subunit 1 ; ELECTRON MICROSCOPY

e7eg9Q1[Q:322-376] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIA subunit 1 ; ELECTRON MICROSCOPY

e7egaQ2[Q:322-376] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIA subunit 1 ; ELECTRON MICROSCOPY

e7egbQ2[Q:322-376] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIA subunit 1 ; ELECTRON MICROSCOPY

e7nvrU2[U:322-376] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIA subunit 1 ; ELECTRON MICROSCOPY

e7nvsU1[U:322-376] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIA subunit 1 ; ELECTRON MICROSCOPY

e7nvtU2[U:322-376] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIA subunit 1 ; ELECTRON MICROSCOPY

e7nvuU1[U:322-376] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIA subunit 1 ; ELECTRON MICROSCOPY

e7nvyU2[U:322-376] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIA subunit 1 ; ELECTRON MICROSCOPY

e7nvzU1[U:322-376] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIA subunit 1 ; ELECTRON MICROSCOPY

e7nw0U1[U:322-376] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIA subunit 1 ; ELECTRON MICROSCOPY

e7egcQ2[Q:322-376] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIA subunit 1 ; ELECTRON MICROSCOPY

e7egdQ2[Q:331-376] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIA subunit 1 ; ELECTRON MICROSCOPY

e7enaDQ2[DQ:322-376] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

TFIIA-a ; ELECTRON MICROSCOPY

e7o4iU1[U:229-286] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIA large subunit,Transcription initiation factor IIA large subunit ; ELECTRON MICROSCOPY

e7egiQ1[Q:331-376] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIA subunit 1 ; ELECTRON MICROSCOPY

e7egjQ1[Q:331-376] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIA subunit 1 ; ELECTRON MICROSCOPY

e7encDQ1[DQ:322-376] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

TFIIA-a ; ELECTRON MICROSCOPY

e7o4jU1[U:229-286] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIA large subunit ; ELECTRON MICROSCOPY

e7o72U2[U:229-286] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIA large subunit ; ELECTRON MICROSCOPY

e7o73U1[U:229-286] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIA large subunit ; ELECTRON MICROSCOPY

e7o75U1[U:229-286] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIA large subunit ; ELECTRON MICROSCOPY

e7ohaL1[L:227-286] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIA large subunit ; ELECTRON MICROSCOPY

e7oh9L1[L:228-286] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIA large subunit ; ELECTRON MICROSCOPY

e7ml2U1[U:241-286] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIA large subunit ; ELECTRON MICROSCOPY

e7ml1U1[U:243-286] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIA large subunit ; ELECTRON MICROSCOPY

e7ml4U1[U:241-286] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIA large subunit ; ELECTRON MICROSCOPY

e8ceoU2[U:229-286] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

TOA1 isoform 1 ; ELECTRON MICROSCOPY

e8gxqDQ2[DQ:322-376] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIA subunit 1 ; ELECTRON MICROSCOPY

e8gxsDQ2[DQ:322-376] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIA subunit 1 ; ELECTRON MICROSCOPY

e7zs9U2[U:229-286] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIA large subunit ; ELECTRON MICROSCOPY

e7zsaU2[U:229-286] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIA large subunit ; ELECTRON MICROSCOPY

e7zsbU2[U:229-286] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIA large subunit ; ELECTRON MICROSCOPY

e7zwcU2[U:332-376] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIA subunit 1 ; ELECTRON MICROSCOPY

e7zwdU1[U:332-376] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIA subunit 1 ; ELECTRON MICROSCOPY

e7zx7U1[U:332-376] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIA subunit 1 ; ELECTRON MICROSCOPY

e7zx8U1[U:332-376] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIA subunit 1 ; ELECTRON MICROSCOPY

e7zxeU2[U:332-376] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIA subunit 1 ; ELECTRON MICROSCOPY

e8bvwU1[U:322-376] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIA subunit 1 ; ELECTRON MICROSCOPY

e8byqU1[U:322-376] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIA subunit 1 ; ELECTRON MICROSCOPY

e8bz1U1[U:322-376] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIA subunit 1 ; ELECTRON MICROSCOPY

e8cenU1[U:229-286] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIA large subunit ; ELECTRON MICROSCOPY

Domain assembly:

e1nh2D1[D:55-121] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIA small chain , X-RAY DIFFRACTION 1.9Å

e1nh2C1[C:228-286] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription initiation factor IIA small chain , X-RAY DIFFRACTION 1.9Å

e1ytfC1[C:241-286] * nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PROTEIN (TRANSCRIPTION FACTOR IIA - TOA1C SUBUNIT) ; X-RAY DIFFRACTION

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