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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

X: Restriction endonuclease-like
H: Acetyl-CoA carboxylase AC4 and AC5 domains
T: Acetyl-CoA carboxylase AC4 and AC5 domains
F: ACC_central

PF08326

Representatives:

e5cslB5[B:1035-1291] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Acetyl-CoA carboxylase ; X-RAY DIFFRACTION 3.200Å

e5cslB6[B:1292-1479] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Acetyl-CoA carboxylase ; X-RAY DIFFRACTION 3.200Å

e5i6hA3[A:1324-1518] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Acetyl-CoA carboxylase-like protein ; X-RAY DIFFRACTION 7.2Å

e5i6hB3[B:1324-1518] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Acetyl-CoA carboxylase-like protein ; X-RAY DIFFRACTION 7.2Å

e5cs4A1[A:1292-1495] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Acetyl-CoA carboxylase ; X-RAY DIFFRACTION 3.200Å

e5cs4B1[B:1292-1495] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Acetyl-CoA carboxylase ; X-RAY DIFFRACTION 3.200Å

e5csaA2[A:1292-1493] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Acetyl-CoA carboxylase ; X-RAY DIFFRACTION 3.000Å

e5csaB1[B:1292-1493] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Acetyl-CoA carboxylase ; X-RAY DIFFRACTION 3.000Å

e5cslA1[A:1292-1480] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Acetyl-CoA carboxylase ; X-RAY DIFFRACTION 3.200Å

e5trcA2[A:1292-1495] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Acetyl-CoA carboxylase ; X-RAY DIFFRACTION 2.900Å

e5i6gA3[A:1324-1517] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Acetyl-CoA carboxylase-like protein,Acetyl-CoA carboxylase-like protein ; X-RAY DIFFRACTION 4.50Å

e5i6gB3[B:1324-1517] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Acetyl-CoA carboxylase-like protein,Acetyl-CoA carboxylase-like protein ; X-RAY DIFFRACTION 4.50Å

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