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




Representatives:
e1rqpA2[A:8-192]
nonrep
Image
Pymol
Jmol Links:
PDB,
SCOP,
CATH, PubMed,
DOI
5'-fluoro-5'-deoxyadenosine synthase ; ligands: SAM ; X-RAY DIFFRACTION 1.8Å
e2v7uA2[A:8-192] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
5'-FLUORO-5'-DEOXY ADENOSINE SYNTHETASE ; ligands: CL,SAM ; X-RAY DIFFRACTION 2.00Å
e1rqrA2[A:8-192] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
5'-fluoro-5'-deoxyadenosine synthase ; ligands: 5FD,MET ; X-RAY DIFFRACTION 2.67Å
e2v7uC2[C:8-192] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
5'-FLUORO-5'-DEOXY ADENOSINE SYNTHETASE ; ligands: CL,SAM ; X-RAY DIFFRACTION 2.00Å
e2cc2C2[C:8-192] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
5'-FLUORO-5'-DEOXYADENOSINE SYNTHASE ; ligands: 5AD ; X-RAY DIFFRACTION 2.000Å
e2c5hC2[C:8-192] Image Pymol Jmol Links: PDB, SCOP, CATH
5'-FLUORO-5'-DEOXYADENOSINE SYNTHASE ; ligands: 3D1,MET ; X-RAY DIFFRACTION 2.700Å
e2c4uD2[D:8-192] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
5'-FLUORO-5'-DEOXYADENOSINE SYNTHASE ; ligands: GOL ; X-RAY DIFFRACTION 2.500Å
e2v7wB2[B:8-192] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
5'-FLUORO-5'-DEOXYADENOSINE SYNTHASE ; ligands: 5FD ; X-RAY DIFFRACTION 1.90Å
e2c4tA2[A:8-192] Image Pymol Jmol Links: PDB, SCOP, CATH
5'-FLUORO-5'-DEOXYADENOSINE SYNTHASE ; ligands: CL,SA8 ; X-RAY DIFFRACTION 2.300Å
e2cc2A2[A:8-192] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
5'-FLUORO-5'-DEOXYADENOSINE SYNTHASE ; ligands: 5AD ; X-RAY DIFFRACTION 2.000Å
e2c4uF2[F:8-192] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
5'-FLUORO-5'-DEOXYADENOSINE SYNTHASE ; ligands: GOL ; X-RAY DIFFRACTION 2.500Å
e2c4uB2[B:8-192] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
5'-FLUORO-5'-DEOXYADENOSINE SYNTHASE ; ligands: GOL ; X-RAY DIFFRACTION 2.500Å
e2c4tB2[B:8-192] Image Pymol Jmol Links: PDB, SCOP, CATH
5'-FLUORO-5'-DEOXYADENOSINE SYNTHASE ; ligands: SA8 ; X-RAY DIFFRACTION 2.300Å
e1rqrC2[C:8-192] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
5'-fluoro-5'-deoxyadenosine synthase ; ligands: 5FD,MET ; X-RAY DIFFRACTION 2.67Å
e2c4uE2[E:8-192] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
5'-FLUORO-5'-DEOXYADENOSINE SYNTHASE ; ligands: GOL ; X-RAY DIFFRACTION 2.500Å
e2cc2B2[B:8-192] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
5'-FLUORO-5'-DEOXYADENOSINE SYNTHASE ; ligands: 5AD ; X-RAY DIFFRACTION 2.000Å
e1rqpB2[B:8-192] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
5'-fluoro-5'-deoxyadenosine synthase ; ligands: SAM ; X-RAY DIFFRACTION 1.8Å
e2c5bB2[B:8-192] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
5'-FLUORO-5'-DEOXYADENOSINE SYNTHASE ; ligands: 5F1,MET ; X-RAY DIFFRACTION 2.4Å
e2v7wA2[A:8-192] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
5'-FLUORO-5'-DEOXYADENOSINE SYNTHASE ; ligands: 5FD ; X-RAY DIFFRACTION 1.90Å
e2c4uC2[C:8-192] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
5'-FLUORO-5'-DEOXYADENOSINE SYNTHASE ; ligands: GOL ; X-RAY DIFFRACTION 2.500Å
e1rqpC2[C:8-192] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
5'-fluoro-5'-deoxyadenosine synthase ; ligands: SAM ; X-RAY DIFFRACTION 1.8Å
e2c4tC2[C:8-192] Image Pymol Jmol Links: PDB, SCOP, CATH
5'-FLUORO-5'-DEOXYADENOSINE SYNTHASE ; ligands: CL,SA8 ; X-RAY DIFFRACTION 2.300Å
e2v7tC2[C:8-192] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
5'-FLUORO-5'-DEOXYADENOSINE SYNTHASE ; ligands: CL,SAH ; X-RAY DIFFRACTION 2.10Å
e2v7vA2[A:8-192] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
5'-FLUORO-5'-DEOXYADENOSINE SYNTHASE ; ligands: 5FD ; X-RAY DIFFRACTION 1.90Å
e2v7tA2[A:8-192] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
5'-FLUORO-5'-DEOXYADENOSINE SYNTHASE ; ligands: CL,SAH ; X-RAY DIFFRACTION 2.10Å
e2v7xB2[B:8-192] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
5'-FLUORO-5'-DEOXYADENOSINE SYNTHASE ; ligands: 5FD,MET ; X-RAY DIFFRACTION 2.00Å
e2c5bC2[C:8-192] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
5'-FLUORO-5'-DEOXYADENOSINE SYNTHASE ; ligands: 5F1,MET ; X-RAY DIFFRACTION 2.4Å
e2c5hB2[B:8-192] Image Pymol Jmol Links: PDB, SCOP, CATH
5'-FLUORO-5'-DEOXYADENOSINE SYNTHASE ; ligands: 3D1,MET ; X-RAY DIFFRACTION 2.700Å
e2c4uA2[A:8-192] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
5'-FLUORO-5'-DEOXYADENOSINE SYNTHASE ; ligands: GOL ; X-RAY DIFFRACTION 2.500Å
e2v7wC2[C:8-192] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
5'-FLUORO-5'-DEOXYADENOSINE SYNTHASE ; ligands: 5FD ; X-RAY DIFFRACTION 1.90Å
e2v7xC2[C:8-192] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
5'-FLUORO-5'-DEOXYADENOSINE SYNTHASE ; ligands: 5FD,MET ; X-RAY DIFFRACTION 2.00Å
e2v7uB2[B:8-192] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
5'-FLUORO-5'-DEOXY ADENOSINE SYNTHETASE ; ligands: CL,SAM ; X-RAY DIFFRACTION 2.00Å
e2c2wA2[A:8-192] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
5'-FLUORO-5'-DEOXYADENOSINE SYNTHASE ; ligands: 5CD,CL ; X-RAY DIFFRACTION 2.000Å
e2v7vC2[C:8-192] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
5'-FLUORO-5'-DEOXYADENOSINE SYNTHASE ; ligands: 5FD ; X-RAY DIFFRACTION 1.90Å
e2c2wC2[C:8-192] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
5'-FLUORO-5'-DEOXYADENOSINE SYNTHASE ; ligands: 5CD,CL ; X-RAY DIFFRACTION 2.000Å
e2c5hA2[A:8-192] Image Pymol Jmol Links: PDB, SCOP, CATH
5'-FLUORO-5'-DEOXYADENOSINE SYNTHASE ; ligands: 3D1,MET ; X-RAY DIFFRACTION 2.700Å
e2cbxB2[B:8-192] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
5'-FLUORO-5'-DEOXYADENOSINE SYNTHASE ; ligands: CC5,GOL ; X-RAY DIFFRACTION 2.000Å
e2cbxA2[A:8-192] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
5'-FLUORO-5'-DEOXYADENOSINE SYNTHASE ; ligands: CC5,GOL ; X-RAY DIFFRACTION 2.000Å
e2c5bA2[A:8-192] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
5'-FLUORO-5'-DEOXYADENOSINE SYNTHASE ; ligands: 5F1,MET ; X-RAY DIFFRACTION 2.4Å
e2cbxC2[C:8-192] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
5'-FLUORO-5'-DEOXYADENOSINE SYNTHASE ; ligands: CC5,GOL ; X-RAY DIFFRACTION 2.000Å
e2v7xA2[A:8-192] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
5'-FLUORO-5'-DEOXYADENOSINE SYNTHASE ; ligands: 5FD,MET ; X-RAY DIFFRACTION 2.00Å
e2v7vB2[B:8-192] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
5'-FLUORO-5'-DEOXYADENOSINE SYNTHASE ; ligands: 5FD ; X-RAY DIFFRACTION 1.90Å
e1rqrB2[B:8-192] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
5'-fluoro-5'-deoxyadenosine synthase ; ligands: 5FD,MET ; X-RAY DIFFRACTION 2.67Å
e2c2wB2[B:8-192] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
5'-FLUORO-5'-DEOXYADENOSINE SYNTHASE ; ligands: 5CD ; X-RAY DIFFRACTION 2.000Å
e2v7tB2[B:8-192] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
5'-FLUORO-5'-DEOXYADENOSINE SYNTHASE ; ligands: CL,SAH ; X-RAY DIFFRACTION 2.10Å
e2wr8A1[A:-2-161] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
PUTATIVE UNCHARACTERIZED PROTEIN PH0463 ; X-RAY DIFFRACTION 1.77Å
e1wu8A1[A:1-161] Image Pymol Jmol Links: PDB, SCOP, CATH
HYPOTHETICAL PROTEIN PH0463 ; ligands: ADN ; X-RAY DIFFRACTION 2.6Å
e2q6lA1[A:-1-164] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hypothetical protein ; ligands: 5CD,MET ; X-RAY DIFFRACTION 2.72Å
e1wu8B2[B:1-161] Image Pymol Jmol Links: PDB, SCOP, CATH
HYPOTHETICAL PROTEIN PH0463 ; ligands: ADN ; X-RAY DIFFRACTION 2.6Å
e1wu8C2[C:1-161] Image Pymol Jmol Links: PDB, SCOP, CATH
HYPOTHETICAL PROTEIN PH0463 ; ligands: ADN ; X-RAY DIFFRACTION 2.6Å
e2zbuA2[A:1-161] Image Pymol Jmol Links: PDB, SCOP, CATH
Uncharacterized conserved protein ; X-RAY DIFFRACTION 2.10Å
e2zbuB2[B:1-161] Image Pymol Jmol Links: PDB, SCOP, CATH
Uncharacterized conserved protein ; ligands: ADN ; X-RAY DIFFRACTION 2.10Å
e2zbuC2[C:1-161] Image Pymol Jmol Links: PDB, SCOP, CATH
Uncharacterized conserved protein ; X-RAY DIFFRACTION 2.10Å
e2zbuD2[D:1-161] Image Pymol Jmol Links: PDB, SCOP, CATH
Uncharacterized conserved protein ; X-RAY DIFFRACTION 2.10Å
e2zbvA2[A:1-161] Image Pymol Jmol Links: PDB, SCOP, CATH
Uncharacterized conserved protein ; ligands: ADN ; X-RAY DIFFRACTION 2.05Å
e2zbvB2[B:1-160] Image Pymol Jmol Links: PDB, SCOP, CATH
Uncharacterized conserved protein ; ligands: ADN ; X-RAY DIFFRACTION 2.05Å
e2zbvC2[C:1-161] Image Pymol Jmol Links: PDB, SCOP, CATH
Uncharacterized conserved protein ; ligands: ADN ; X-RAY DIFFRACTION 2.05Å
e2q6iA2[A:1-164] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HYPOTHETICAL PROTEIN ; ligands: 5CD,MET,PEG ; X-RAY DIFFRACTION 2.6Å
e2q6kA2[A:1-163] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
CHLORINASE ; ligands: ADN,PEG ; X-RAY DIFFRACTION 1.55Å
e2q6oA2[A:3-164] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hypothetical Protein ; ligands: CL,SAM ; X-RAY DIFFRACTION 2Å
e2q6oB2[B:3-164] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hypothetical Protein ; ligands: CL,SAM ; X-RAY DIFFRACTION 2Å
e2cw5A4[A:1-114,A:134-168] Image Pymol Jmol Links: PDB, SCOP, CATH
BACTERIAL FLUORINATING ENZYME HOMOLOG ; X-RAY DIFFRACTION 1.94Å
e2f4nA3[A:9-165] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hypothetical protein MJ1651 ; X-RAY DIFFRACTION 2.36Å
e2f4nC5[C:11-165] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hypothetical protein MJ1651 ; X-RAY DIFFRACTION 2.36Å
e2cw5C5[C:1-166] Image Pymol Jmol Links: PDB, SCOP, CATH
BACTERIAL FLUORINATING ENZYME HOMOLOG ; X-RAY DIFFRACTION 1.94Å
e2f4nB3[B:11-165] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hypothetical protein MJ1651 ; X-RAY DIFFRACTION 2.36Å
e2cw5B4[B:1-112,B:134-168] Image Pymol Jmol Links: PDB, SCOP, CATH
BACTERIAL FLUORINATING ENZYME HOMOLOG ; X-RAY DIFFRACTION 1.94Å
e4cqjA2[A:8-192] Image Pymol Jmol Links: PDB, SCOP, CATH
5'-FLUORO-5'-DEOXY-ADENOSINE SYNTHASE ; ligands: EFA ; X-RAY DIFFRACTION 2.44Å
e4cqjB2[B:8-192] Image Pymol Jmol Links: PDB, SCOP, CATH
5'-FLUORO-5'-DEOXY-ADENOSINE SYNTHASE ; ligands: EFA ; X-RAY DIFFRACTION 2.44Å
e4cqjC2[C:8-192] Image Pymol Jmol Links: PDB, SCOP, CATH
5'-FLUORO-5'-DEOXY-ADENOSINE SYNTHASE ; ligands: EFA ; X-RAY DIFFRACTION 2.44Å
e5fiuA2[A:8-192] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
5'-FLUORO-5'-DEOXY-ADENOSINE SYNTHASE ; ligands: TLA,Y3J ; X-RAY DIFFRACTION 1.84Å
e5fiuB2[B:8-192] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
5'-FLUORO-5'-DEOXY-ADENOSINE SYNTHASE ; ligands: TLA,Y3J ; X-RAY DIFFRACTION 1.84Å
e5fiuC2[C:8-192] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
5'-FLUORO-5'-DEOXY-ADENOSINE SYNTHASE ; ligands: TLA,Y3J ; X-RAY DIFFRACTION 1.84Å
e5lmzA2[A:8-192] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Fluorinase ; ligands: CL,GOL ; X-RAY DIFFRACTION 2.55Å
e5lmzB2[B:8-192] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Fluorinase ; ligands: CL,GOL ; X-RAY DIFFRACTION 2.55Å
e5b6iA1[A:8-192] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Fluorinase ; ligands: ADN,MET ; X-RAY DIFFRACTION 1.800Å
e5b6iB2[B:8-192] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Fluorinase ; ligands: ADN,MET ; X-RAY DIFFRACTION 1.800Å
e6ryzB2[B:1-164] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Adenosyl-chloride synthase ; ligands: CL,EDO,SAM ; X-RAY DIFFRACTION 1.50Å
e6ryzA2[A:2-164] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Adenosyl-chloride synthase ; ligands: CL,SAM ; X-RAY DIFFRACTION 1.50Å
e6ryzC2[C:2-164] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Adenosyl-chloride synthase ; ligands: CL,EDO,SAM ; X-RAY DIFFRACTION 1.50Å
e6rz2A2[A:1-164] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Adenosyl-chloride synthase ; ligands: 5CD ; X-RAY DIFFRACTION 1.77Å
e6rz2B1[B:2-164] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Adenosyl-chloride synthase ; ligands: 5CD ; X-RAY DIFFRACTION 1.77Å
e6rz2C2[C:2-164] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Adenosyl-chloride synthase ; ligands: 5CD ; X-RAY DIFFRACTION 1.77Å
e7ccgA2[A:4-164] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DNA-directed RNA polymerase subunit delta ; ligands: 5CD,MET ; X-RAY DIFFRACTION 1.85Å
e7xtoA1[A:5-164] Image Pymol Jmol Links: PDB, SCOP, CATH
soil bacterial derived chlorinase ; ligands: 1DA ; X-RAY DIFFRACTION 2.48Å
e7xtoC1[C:6-164] Image Pymol Jmol Links: PDB, SCOP, CATH
soil bacterial derived chlorinase ; ligands: 1DA ; X-RAY DIFFRACTION 2.48Å
e7xtoD2[D:5-164] Image Pymol Jmol Links: PDB, SCOP, CATH
soil bacterial derived chlorinase ; ligands: 1DA ; X-RAY DIFFRACTION 2.48Å
e7xtoB2[B:5-164] Image Pymol Jmol Links: PDB, SCOP, CATH
soil bacterial derived chlorinase ; ligands: 1DA ; X-RAY DIFFRACTION 2.48Å
e7xtoE2[E:6-164] Image Pymol Jmol Links: PDB, SCOP, CATH
soil bacterial derived chlorinase ; ligands: 1DA ; X-RAY DIFFRACTION 2.48Å
e7xtoF2[F:5-164] Image Pymol Jmol Links: PDB, SCOP, CATH
soil bacterial derived chlorinase ; ligands: 1DA ; X-RAY DIFFRACTION 2.48Å
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