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
![](/ecod/img/m.gif)
![](/ecod/img/m.gif)
![](/ecod/img/p.gif)
![](/ecod/img/m.gif)
Representatives:
e1i12A1[A:3-159]
nonrep
Image
Pymol
Jmol Links:
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GLUCOSAMINE-PHOSPHATE N-ACETYLTRANSFERASE ; ligands: ACO,IMD ; X-RAY DIFFRACTION 1.30Å
e4m3sA1[A:1-160]
nonrep
Image
Pymol
Jmol Links:
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CATH
Uncharacterized protein ; ligands: CL,EPE,SO4 ; X-RAY DIFFRACTION 1.30Å
e5hgzA1[A:1-211]
nonrep
Image
Pymol
Jmol Links:
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DOI
N-alpha-acetyltransferase 60 ; ligands: ACO,MLA ; X-RAY DIFFRACTION 1.383Å
e1gheA1[A:4-173]
nonrep
Image
Pymol
Jmol Links:
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ACETYLTRANSFERASE ; ligands: ACO ; X-RAY DIFFRACTION 1.40Å
e2aj6A1[A:1-118]
nonrep
Image
Pymol
Jmol Links:
PDB,
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CATH
hypothetical protein MW0638 ; ligands: SO4,UNL ; X-RAY DIFFRACTION 1.50Å
Domain assembly:
Domain assembly:
e2fl4A1[A:1-146]
nonrep
Image
Pymol
Jmol Links:
PDB,
SCOP,
CATH
spermine/spermidine acetyltransferase ; X-RAY DIFFRACTION 1.6Å
e2jdcA1[A:2-146]
nonrep
Image
Pymol
Jmol Links:
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CATH, PubMed,
DOI
GLYPHOSATE N-ACETYLTRANSFERASE ; ligands: CAO,SO4 ; X-RAY DIFFRACTION 1.6Å
e5ib0A1[A:1-137]
nonrep
Image
Pymol
Jmol Links:
PDB,
SCOP,
CATH
Uncharacterized protein PA4534 ; ligands: ACO,GOL ; X-RAY DIFFRACTION 1.65Å
e1mk4A1[A:0-156]
nonrep
Image
Pymol
Jmol Links:
PDB,
SCOP,
CATH
Hypothetical protein yqjY ; X-RAY DIFFRACTION 1.7Å
e1vhsA1[A:0-164]
nonrep
Image
Pymol
Jmol Links:
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SCOP,
CATH, PubMed,
DOI
similar to phosphinothricin acetyltransferase ; X-RAY DIFFRACTION 1.70Å
e1y7rA1[A:1-133]
nonrep
Image
Pymol
Jmol Links:
PDB,
SCOP,
CATH
hypothetical protein SA2161 ; ligands: PO4 ; X-RAY DIFFRACTION 1.70Å
e1z4rA1[A:497-658]
nonrep
Image
Pymol
Jmol Links:
PDB,
SCOP,
CATH, PubMed,
DOI
GENERAL CONTROL OF AMINO ACID SYNTHESIS PROTEIN 5-LIKE 2 ; ligands: ACO ; X-RAY DIFFRACTION 1.74Å
e1wwzA1[A:1-157]
nonrep
Image
Pymol
Jmol Links:
PDB,
SCOP,
CATH
hypothetical protein PH1933 ; ligands: ACO ; X-RAY DIFFRACTION 1.75Å
e1cjwA1[A:30-195]
nonrep
Image
Pymol
Jmol Links:
PDB,
SCOP,
CATH, PubMed,
DOI
PROTEIN (SEROTONIN N-ACETYLTRANSFERASE) ; ligands: COT ; X-RAY DIFFRACTION 1.8Å
e1n71A1[A:1-180]
nonrep
Image
Pymol
Jmol Links:
PDB,
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CATH, PubMed,
DOI
aac(6')-Ii ; ligands: COA ; X-RAY DIFFRACTION 1.80Å
e1vkcA1[A:2-150]
nonrep
Image
Pymol
Jmol Links:
PDB,
SCOP,
CATH
putative acetyl transferase ; ligands: IOD ; X-RAY DIFFRACTION 1.89Å
e1y9wA1[A:1-140]
nonrep
Image
Pymol
Jmol Links:
PDB,
SCOP,
CATH
Acetyltransferase ; X-RAY DIFFRACTION 1.9Å
e1yvoA1[A:4-172]
nonrep
Image
Pymol
Jmol Links:
PDB,
SCOP,
CATH
CONSERVED HYPOTHETICAL PROTEIN ; X-RAY DIFFRACTION 1.9Å
e2g3aA1[A:1-137]
nonrep
Image
Pymol
Jmol Links:
PDB,
SCOP,
CATH
acetyltransferase ; X-RAY DIFFRACTION 1.9Å
e1tiqA1[A:2-174]
nonrep
Image
Pymol
Jmol Links:
PDB,
SCOP,
CATH, PubMed,
DOI
Protease synthase and sporulation negative regulatory protein PAI 1 ; ligands: COA,DTT ; X-RAY DIFFRACTION 1.90Å
e4pv6J1[J:7-157] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
N-terminal acetyltransferase complex subunit [ARD1] ; ligands: ACO ; X-RAY DIFFRACTION 3.3Å
e4pv6P1[P:9-155] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
N-terminal acetyltransferase complex subunit [ARD1] ; X-RAY DIFFRACTION 3.3Å
e4pv6C1[C:7-159] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
N-terminal acetyltransferase complex subunit [ARD1] ; ligands: ACO ; X-RAY DIFFRACTION 3.3Å
e4pv6G1[G:6-159] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
N-terminal acetyltransferase complex subunit [ARD1] ; ligands: ACO ; X-RAY DIFFRACTION 3.3Å
e4pv6I1[I:6-156] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
N-terminal acetyltransferase complex subunit [ARD1] ; ligands: ACO ; X-RAY DIFFRACTION 3.3Å
e4pv6K1[K:9-157] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
N-terminal acetyltransferase complex subunit [ARD1] ; X-RAY DIFFRACTION 3.3Å
e4pv6M1[M:9-156] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
N-terminal acetyltransferase complex subunit [ARD1] ; X-RAY DIFFRACTION 3.3Å
e4pv6F1[F:8-157] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
N-terminal acetyltransferase complex subunit [ARD1] ; ligands: ACO ; X-RAY DIFFRACTION 3.3Å
e4pv6N1[N:9-156] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
N-terminal acetyltransferase complex subunit [ARD1] ; X-RAY DIFFRACTION 3.3Å
e4pv6A1[A:6-159] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
N-terminal acetyltransferase complex subunit [ARD1] ; ligands: COA ; X-RAY DIFFRACTION 3.3Å
e4pv6B1[B:9-156] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
N-terminal acetyltransferase complex subunit [ARD1] ; X-RAY DIFFRACTION 3.3Å
e4pv6H1[H:7-159] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
N-terminal acetyltransferase complex subunit [ARD1] ; ligands: ACO ; X-RAY DIFFRACTION 3.3Å
e4pv6L1[L:8-156] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
N-terminal acetyltransferase complex subunit [ARD1] ; X-RAY DIFFRACTION 3.3Å
e4pv6O1[O:9-157] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
N-terminal acetyltransferase complex subunit [ARD1] ; X-RAY DIFFRACTION 3.3Å
e4pv6E1[E:8-158] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
N-terminal acetyltransferase complex subunit [ARD1] ; ligands: ACO ; X-RAY DIFFRACTION 3.3Å
e2cnmA1[A:1-151] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
MODIFICATION OF 30S RIBOSOMAL SUBUNIT PROTEIN S18 ; ligands: COA ; X-RAY DIFFRACTION 2.600Å
e2cnmB1[B:1-151] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
MODIFICATION OF 30S RIBOSOMAL SUBUNIT PROTEIN S18 ; ligands: COA ; X-RAY DIFFRACTION 2.600Å
e2cnmC1[C:1-151] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
MODIFICATION OF 30S RIBOSOMAL SUBUNIT PROTEIN S18 ; ligands: COA ; X-RAY DIFFRACTION 2.600Å
e2cnsA1[A:1-151] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
MODIFICATION OF 30S RIBOSOMAL SUBUNIT PROTEIN S18 ; ligands: ACO,PO4 ; X-RAY DIFFRACTION 2.500Å
e2cnsB1[B:1-151] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
MODIFICATION OF 30S RIBOSOMAL SUBUNIT PROTEIN S18 ; ligands: ACO,PO4 ; X-RAY DIFFRACTION 2.500Å
e2cnsC1[C:1-151] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
MODIFICATION OF 30S RIBOSOMAL SUBUNIT PROTEIN S18 ; ligands: ACO,PO4 ; X-RAY DIFFRACTION 2.500Å
e2cntA1[A:1-151] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
MODIFICATION OF 30S RIBOSOMAL SUBUNIT PROTEIN S18 ; ligands: COA,GOL ; X-RAY DIFFRACTION 2.400Å
e2cntB1[B:1-151] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
MODIFICATION OF 30S RIBOSOMAL SUBUNIT PROTEIN S18 ; ligands: COA,GOL,SO4 ; X-RAY DIFFRACTION 2.400Å
e2cntC1[C:1-151] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
MODIFICATION OF 30S RIBOSOMAL SUBUNIT PROTEIN S18 ; ligands: COA,GOL ; X-RAY DIFFRACTION 2.400Å
e2cntD1[D:1-151] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
MODIFICATION OF 30S RIBOSOMAL SUBUNIT PROTEIN S18 ; ligands: COA,GOL ; X-RAY DIFFRACTION 2.400Å
e3f8kA1[A:5-146] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Protein acetyltransferase ; ligands: COA ; X-RAY DIFFRACTION 1.84Å
e1tiqB1[B:2-174] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Protease synthase and sporulation negative regulatory protein PAI 1 ; ligands: COA,SO4 ; X-RAY DIFFRACTION 1.90Å
e5hh1A1[A:5-199] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
N-alpha-acetyltransferase 60 ; ligands: COA ; X-RAY DIFFRACTION 1.80Å
e5ygeA1[A:6-174] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Amino-acid acetyltransferase ; ligands: ACO,CAD,GLU ; X-RAY DIFFRACTION 2.039Å
e5ygeB1[B:8-174] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Amino-acid acetyltransferase ; ligands: ACO,CAD,GLU ; X-RAY DIFFRACTION 2.039Å
e5k9nA1[A:7-216] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Polyamine N acetyltransferase ; X-RAY DIFFRACTION 2.3Å
e5k9nB1[B:8-216] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Polyamine N acetyltransferase ; X-RAY DIFFRACTION 2.3Å
e6ao7A1[A:2-154] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Acetyltransferase ; ligands: ACO,SO4 ; X-RAY DIFFRACTION 1.850Å
e5yagA1[A:1-217] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
AAEL004827-PA ; ligands: GOL ; X-RAY DIFFRACTION 1.948Å
e5yagB1[B:5-217] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
AAEL004827-PA ; ligands: GOL ; X-RAY DIFFRACTION 1.948Å
e5yo2A1[A:7-174] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Amino-acid acetyltransferase ; ligands: ACO,ARG ; X-RAY DIFFRACTION 3.000Å
e5yo2B1[B:10-175] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Amino-acid acetyltransferase ; ligands: ARG ; X-RAY DIFFRACTION 3.000Å
e6hd5v1[v:3-176] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
N-alpha-acetyltransferase NAT5 ; ELECTRON MICROSCOPY
e6addA1[A:7-174] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Amino-acid acetyltransferase ; ligands: COA,NLQ ; X-RAY DIFFRACTION 2.30Å
e6hd7v1[v:3-176] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
N-alpha-acetyltransferase NAT5 ; ELECTRON MICROSCOPY
e6addB1[B:10-175] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Amino-acid acetyltransferase ; ligands: COA,NLQ ; X-RAY DIFFRACTION 2.30Å
e6o07C1[C:5-40,C:60-175] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
N-terminal acetyltransferase A complex subunit NAT5 ; ligands: ACO,CL,GOL ; X-RAY DIFFRACTION 2.7Å
e6th0B1[B:24-197] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Acyl-CoA N-acyltransferases (NAT) superfamily protein ; ligands: ACO ; X-RAY DIFFRACTION 1.75Å
e7ciuA1[A:7-216] Image Pymol Jmol Links: PDB, SCOP, CATH
Agmatine N-acetyltransferase ; X-RAY DIFFRACTION 1.820Å
e7civA1[A:2-216] Image Pymol Jmol Links: PDB, SCOP, CATH
Agmatine N-acetyltransferase ; ligands: ACO ; X-RAY DIFFRACTION 1.8480Å
e7ciwA1[A:1-216] Image Pymol Jmol Links: PDB, SCOP, CATH
Agmatine N-acetyltransferase ; ligands: COA,G0R ; X-RAY DIFFRACTION 1.5990Å
e7cixA1[A:1-216] Image Pymol Jmol Links: PDB, SCOP, CATH
Agmatine N-acetyltransferase ; ligands: COA ; X-RAY DIFFRACTION 1.7480Å
e7ciuB1[B:8-216] Image Pymol Jmol Links: PDB, SCOP, CATH
Agmatine N-acetyltransferase ; X-RAY DIFFRACTION 1.820Å
e8hehA1[A:20-161] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
GNAT family N-acetyltransferase ; ligands: COA,GOL ; X-RAY DIFFRACTION 1.4Å
e1z4eA1[A:4-153]
nonrep
Image
Pymol
Jmol Links:
PDB,
SCOP,
CATH
transcriptional regulator ; X-RAY DIFFRACTION 2.0Å
e2cy2A1[A:1-174]
nonrep
Image
Pymol
Jmol Links:
PDB,
SCOP,
CATH
PROBABLE ACETYLTRANSFERASE ; ligands: ACO ; X-RAY DIFFRACTION 2.0Å
e2fe7A1[A:3-158]
nonrep
Image
Pymol
Jmol Links:
PDB,
SCOP,
CATH
probable N-acetyltransferase ; X-RAY DIFFRACTION 2.0Å
Domain assembly:
Domain assembly:
e1s3zA1[A:-1-145]
nonrep
Image
Pymol
Jmol Links:
PDB,
SCOP,
CATH, PubMed,
DOI
aminoglycoside 6'-N-acetyltransferase ; ligands: COA,NI,RIO,SO4 ; X-RAY DIFFRACTION 2.000Å
e2ganA1[A:1-182]
nonrep
Image
Pymol
Jmol Links:
PDB,
SCOP,
CATH
182aa long hypothetical protein ; ligands: EDO,SO4 ; X-RAY DIFFRACTION 2.1Å
e2ae6A1[A:1-161]
nonrep
Image
Pymol
Jmol Links:
PDB,
SCOP,
CATH
ACETYLTRANSFERASE, GNAT FAMILY ; ligands: GOL,MG ; X-RAY DIFFRACTION 2.19Å
e1ufhA1[A:2-156]
nonrep
Image
Pymol
Jmol Links:
PDB,
SCOP,
CATH, PubMed,
DOI
YYCN protein ; X-RAY DIFFRACTION 2.2Å
e2ge3A1[A:6-169]
nonrep
Image
Pymol
Jmol Links:
PDB,
SCOP,
CATH
PROBABLE ACETYLTRANSFERASE ; ligands: ACO ; X-RAY DIFFRACTION 2.25Å
e4hnyD1[D:2-239]
nonrep
Image
Pymol
Jmol Links:
PDB,
SCOP,
CATH
N-TERMINAL ACETYLTRANSFERASE A COMPLEX CATALYTIC SUBUNIT ARD1 ; X-RAY DIFFRACTION 2.25Å
e1bo4A1[A:25-161]
nonrep
Image
Pymol
Jmol Links:
PDB,
SCOP,
CATH, PubMed,
DOI
PROTEIN (SERRATIA MARCESCENS AMINOGLYCOSIDE-3-N-ACETYLTRANSFERASE) ; ligands: COA,SPD ; X-RAY DIFFRACTION 2.3Å
e4hnxB1[B:2-54,B:79-238]
nonrep
Image
Pymol
Jmol Links:
PDB,
SCOP,
CATH
N-terminal acetyltransferase A complex catalytic subunit ARD1 ; ligands: G4P ; X-RAY DIFFRACTION 2.339Å
e1y9kA1[A:1-152]
nonrep
Image
Pymol
Jmol Links:
PDB,
SCOP,
CATH
IAA ACETYLTRANSFERASE ; X-RAY DIFFRACTION 2.39Å
e1u6mA1[A:2-190]
nonrep
Image
Pymol
Jmol Links:
PDB,
SCOP,
CATH
acetyltransferase, GNAT family ; ligands: SO4 ; X-RAY DIFFRACTION 2.4Å
e1qsmA1[A:7-156]
nonrep
Image
Pymol
Jmol Links:
PDB,
SCOP,
CATH, PubMed,
DOI
HPA2 HISTONE ACETYLTRANSFERASE ; ligands: ACO ; X-RAY DIFFRACTION 2.400Å
e2fiaA1[A:1-157]
nonrep
Image
Pymol
Jmol Links:
PDB,
SCOP,
CATH
acetyltransferase ; X-RAY DIFFRACTION 2.6Å
e2euiA1[A:1-153]
nonrep
Image
Pymol
Jmol Links:
PDB,
SCOP,
CATH
Probable acetyltransferase ; X-RAY DIFFRACTION 2.8Å
![](/ecod/img/p.gif)
Pseudo group of domains that do not map to PFam family profiles. Domains inside should not be considered as in one family.
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