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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: The "swivelling" beta/beta/alpha domains
H: The "swivelling" beta/beta/alpha domain
T: The "swivelling" beta/beta/alpha domain
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.

Representatives:

e1zl0A2[A:170-307] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

HYPOTHETICAL PROTEIN PA5198 ; ligands: EDO,GOL,K,NA,TLA ; X-RAY DIFFRACTION 1.1Å

e2aunB2[B:170-307] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

hypothetical protein ; X-RAY DIFFRACTION 2.4Å

e1zl0B2[B:170-307] Image Pymol Jmol Links: PDB, SCOP, CATH

HYPOTHETICAL PROTEIN PA5198 ; ligands: EDO,GOL,K,PEG,TLA ; X-RAY DIFFRACTION 1.1Å

e2aumA2[A:170-307] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

hypothetical protein ; X-RAY DIFFRACTION 2.4Å

e2aunA2[A:170-307] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

hypothetical protein ; X-RAY DIFFRACTION 2.4Å

e1zrsB2[B:170-307] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

hypothetical protein ; X-RAY DIFFRACTION 1.5Å

e1zrsA2[A:170-307] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

hypothetical protein ; X-RAY DIFFRACTION 1.5Å

e2aumB2[B:170-307] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

hypothetical protein ; X-RAY DIFFRACTION 2.4Å

e3g23A2[A:148-271] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

LD-carboxypeptidase A ; ligands: GOL,SO4,UNL ; X-RAY DIFFRACTION 1.89Å

e3g23B2[B:148-271] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

LD-carboxypeptidase A ; ligands: GOL,SO4,UNL ; X-RAY DIFFRACTION 1.89Å

e4h1hA4[A:156-324] Image Pymol Jmol Links: PDB, SCOP, CATH

LMO1638 PROTEIN ; ligands: SO4 ; X-RAY DIFFRACTION 2.46Å

e4e94A4[A:155-343] Image Pymol Jmol Links: PDB, SCOP, CATH

MccC family protein ; ligands: GOL,SO4 ; X-RAY DIFFRACTION 1.65Å

e4injA4[A:155-324] Image Pymol Jmol Links: PDB, SCOP, CATH

Lmo1638 protein ; ligands: GOL,LMS ; X-RAY DIFFRACTION 2.40Å

e4injB4[B:155-324] Image Pymol Jmol Links: PDB, SCOP, CATH

Lmo1638 protein ; ligands: GOL,LMS ; X-RAY DIFFRACTION 2.40Å

e4h1hB4[B:156-324] Image Pymol Jmol Links: PDB, SCOP, CATH

LMO1638 PROTEIN ; ligands: SO4 ; X-RAY DIFFRACTION 2.46Å

e4e94B4[B:155-341] Image Pymol Jmol Links: PDB, SCOP, CATH

MccC family protein ; X-RAY DIFFRACTION 1.65Å

e4eysA6[A:155-343] Image Pymol Jmol Links: PDB, SCOP, CATH

MCCC FAMILY PROTEIN ; ligands: ACT,AMP,SO4 ; X-RAY DIFFRACTION 1.58Å

e4e5sA3[A:156-328] Image Pymol Jmol Links: PDB, SCOP, CATH

MCCFLIKE PROTEIN (BA_5613) ; X-RAY DIFFRACTION 1.95Å

e4e5sC3[C:156-328] Image Pymol Jmol Links: PDB, SCOP, CATH

MCCFLIKE PROTEIN (BA_5613) ; X-RAY DIFFRACTION 1.95Å

e4e5sD3[D:156-328] Image Pymol Jmol Links: PDB, SCOP, CATH

MCCFLIKE PROTEIN (BA_5613) ; X-RAY DIFFRACTION 1.95Å

e3sr3B1[B:159-169,B:193-333] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

MICROCIN IMMUNITY PROTEIN MCCF ; X-RAY DIFFRACTION 1.5Å

e4e5sB1[B:156-328] Image Pymol Jmol Links: PDB, SCOP, CATH

MCCFLIKE PROTEIN (BA_5613) ; X-RAY DIFFRACTION 1.95Å

e3gjzB2[B:196-333] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

MICROCIN IMMUNITY PROTEIN MCCF ; X-RAY DIFFRACTION 2.1Å

e3gjzA2[A:196-333] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

MICROCIN IMMUNITY PROTEIN MCCF ; X-RAY DIFFRACTION 2.1Å

e3u1bB2[B:196-333] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

MICROCIN IMMUNITY PROTEIN MCCF ; ligands: AMP ; X-RAY DIFFRACTION 1.6Å

e3u1bA2[A:196-333] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

MICROCIN IMMUNITY PROTEIN MCCF ; ligands: AMP ; X-RAY DIFFRACTION 1.6Å

e3t5mA2[A:196-333] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Microcin immunity protein MccF ; ligands: AMP,GOL ; X-RAY DIFFRACTION 1.75Å

e3t5mB2[B:196-333] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Microcin immunity protein MccF ; ligands: AMP ; X-RAY DIFFRACTION 1.75Å

e4mi1B2[B:196-333] Image Pymol Jmol Links: PDB, SCOP, CATH

Microcin immunity protein MccF ; ligands: DSZ,SO4 ; X-RAY DIFFRACTION 1.40Å

e4mi1A2[A:196-333] Image Pymol Jmol Links: PDB, SCOP, CATH

Microcin immunity protein MccF ; ligands: DSZ ; X-RAY DIFFRACTION 1.40Å

e4iiyB1[B:173-189,B:209-343] Image Pymol Jmol Links: PDB, SCOP, CATH

MccF ; ligands: 1EI,EDO ; X-RAY DIFFRACTION 1.2Å

e4iiyA2[A:173-189,A:209-341] Image Pymol Jmol Links: PDB, SCOP, CATH

MccF ; ligands: 1EI,EDO ; X-RAY DIFFRACTION 1.2Å

e3tyxA2[A:196-333] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

MICROCIN IMMUNITY PROTEIN MCCF ; ligands: AMP ; X-RAY DIFFRACTION 2.04Å

e3tyxB2[B:196-333] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

MICROCIN IMMUNITY PROTEIN MCCF ; ligands: AMP ; X-RAY DIFFRACTION 2.04Å

e3tlzB2[B:173-341] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

MCCF ; ligands: AMP,EDO ; X-RAY DIFFRACTION 1.5Å

e3tlzA2[A:173-341] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

MCCF ; ligands: AMP,EDO ; X-RAY DIFFRACTION 1.5Å

e3tlgA1[A:173-189,A:209-341] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

MccF ; X-RAY DIFFRACTION 1.499Å

e3tlgB2[B:173-189,B:209-341] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

MccF ; X-RAY DIFFRACTION 1.499Å

e4iixB1[B:173-189,B:209-341] Image Pymol Jmol Links: PDB, SCOP, CATH

MccF ; ligands: 1EG,EDO ; X-RAY DIFFRACTION 1.229Å

e4iixA1[A:173-189,A:209-344] Image Pymol Jmol Links: PDB, SCOP, CATH

MccF ; ligands: 1EG,EDO ; X-RAY DIFFRACTION 1.229Å

e3tlyA1[A:173-189,A:209-341] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

MccF ; ligands: EDO ; X-RAY DIFFRACTION 1.690Å

e3tlyB2[B:173-189,B:209-341] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

MccF ; ligands: EDO ; X-RAY DIFFRACTION 1.690Å

e3tlcB2[B:173-189,B:209-341] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

MccF ; ligands: 7MD,EDO ; X-RAY DIFFRACTION 1.300Å

e3tlcA1[A:173-189,A:209-341] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

MccF ; ligands: 7MD,EDO ; X-RAY DIFFRACTION 1.300Å

e3sr3A2[A:196-333] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

MICROCIN IMMUNITY PROTEIN MCCF ; X-RAY DIFFRACTION 1.5Å

e4jvoA2[A:196-333] Image Pymol Jmol Links: PDB, SCOP, CATH

MICROCIN IMMUNITY PROTEIN MCCF ; ligands: A5A ; X-RAY DIFFRACTION 1.3Å

e4jvoB2[B:196-333] Image Pymol Jmol Links: PDB, SCOP, CATH

MICROCIN IMMUNITY PROTEIN MCCF ; ligands: A5A,GOL ; X-RAY DIFFRACTION 1.3Å

e3tlaA1[A:173-189,A:209-341] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

MccF ; ligands: EDO ; X-RAY DIFFRACTION 1.200Å

e3tlaB2[B:173-189,B:209-341] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

MccF ; X-RAY DIFFRACTION 1.200Å

e3tlbB2[B:173-189,B:209-341] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

MccF ; ligands: DSZ ; X-RAY DIFFRACTION 1.500Å

e3tlbA2[A:173-189,A:209-341] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

MccF ; ligands: DSZ ; X-RAY DIFFRACTION 1.500Å

e3tleA1[A:173-189,A:209-341] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

MccF ; ligands: GSU ; X-RAY DIFFRACTION 1.300Å

e3tleB2[B:173-189,B:209-341] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

MccF ; ligands: EDO,GSU ; X-RAY DIFFRACTION 1.300Å

e4mjxB2[B:196-333] Image Pymol Jmol Links: PDB, SCOP, CATH

Microcin immunity protein MccF ; ligands: GOL ; X-RAY DIFFRACTION 1.40Å

e4mjxA2[A:196-333] Image Pymol Jmol Links: PDB, SCOP, CATH

Microcin immunity protein MccF ; ligands: EDO,GOL ; X-RAY DIFFRACTION 1.40Å

e5f1yA1[A:162-343] Image Pymol Jmol Links: PDB, SCOP, CATH

MccC family protein ; X-RAY DIFFRACTION 2.04Å

e5f1yB2[B:162-343] Image Pymol Jmol Links: PDB, SCOP, CATH

MccC family protein ; ligands: GOL ; X-RAY DIFFRACTION 2.04Å

e5f5xA2[A:162-343] Image Pymol Jmol Links: PDB, SCOP, CATH

MccC family protein Ba3275 ; ligands: AMP ; X-RAY DIFFRACTION 2.00Å

e5f5xB2[B:162-343] Image Pymol Jmol Links: PDB, SCOP, CATH

MccC family protein Ba3275 ; ligands: AMP ; X-RAY DIFFRACTION 2.00Å

e5f9mA2[A:162-343] Image Pymol Jmol Links: PDB, SCOP, CATH

MccC family protein ; X-RAY DIFFRACTION 2.4Å

e5f9mB2[B:162-343] Image Pymol Jmol Links: PDB, SCOP, CATH

MccC family protein ; X-RAY DIFFRACTION 2.4Å

e5f9mC1[C:162-343] Image Pymol Jmol Links: PDB, SCOP, CATH

MccC family protein ; X-RAY DIFFRACTION 2.4Å

e5f9mD1[D:162-343] Image Pymol Jmol Links: PDB, SCOP, CATH

MccC family protein ; X-RAY DIFFRACTION 2.4Å

e5fd8A2[A:156-328] Image Pymol Jmol Links: PDB, SCOP, CATH

LD-carboxypeptidase family protein ; ligands: A5A ; X-RAY DIFFRACTION 2.05Å

e5fd8B1[B:156-328] Image Pymol Jmol Links: PDB, SCOP, CATH

LD-carboxypeptidase family protein ; ligands: A5A ; X-RAY DIFFRACTION 2.05Å

e5jybA1[A:162-343] Image Pymol Jmol Links: PDB, SCOP, CATH

MccC family protein ; ligands: EPE,GOL,P6G,SBT ; X-RAY DIFFRACTION 1.647Å

e5jybB1[B:162-343] Image Pymol Jmol Links: PDB, SCOP, CATH

MccC family protein ; ligands: EPE,GOL,P6G,SBT ; X-RAY DIFFRACTION 1.647Å

e5usdA2[A:156-328] Image Pymol Jmol Links: PDB, SCOP, CATH

Peptidase S66 ; ligands: DSZ,GOL ; X-RAY DIFFRACTION 2.095Å

e5usdC1[C:156-328] Image Pymol Jmol Links: PDB, SCOP, CATH

Peptidase S66 ; ligands: DSZ,GOL ; X-RAY DIFFRACTION 2.095Å

e5usdB2[B:156-328] Image Pymol Jmol Links: PDB, SCOP, CATH

Peptidase S66 ; ligands: DSZ ; X-RAY DIFFRACTION 2.095Å

e5usdD1[D:156-328] Image Pymol Jmol Links: PDB, SCOP, CATH

Peptidase S66 ; ligands: DSZ ; X-RAY DIFFRACTION 2.095Å

e5k99A1[A:196-333] Image Pymol Jmol Links: PDB, SCOP, CATH

Microcin C7 self-immunity protein mccF ; X-RAY DIFFRACTION 1.500Å

e5k99B2[B:196-333] Image Pymol Jmol Links: PDB, SCOP, CATH

Microcin C7 self-immunity protein mccF ; X-RAY DIFFRACTION 1.500Å

e5z01A1[A:135-303] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Murein tetrapeptide carboxypeptidase ; ligands: MG ; X-RAY DIFFRACTION 1.75Å

e5z03A2[A:135-304] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Murein tetrapeptide carboxypeptidase ; X-RAY DIFFRACTION 1.75Å

e5z03B1[B:135-304] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Murein tetrapeptide carboxypeptidase ; X-RAY DIFFRACTION 1.75Å

e6uukA1[A:198-364] Image Pymol Jmol Links: PDB, SCOP, CATH

Muramoyltetrapeptide carboxypeptidase ; X-RAY DIFFRACTION 2.348Å

e6uukB2[B:198-365] Image Pymol Jmol Links: PDB, SCOP, CATH

Muramoyltetrapeptide carboxypeptidase ; X-RAY DIFFRACTION 2.348Å

e3i6sA4[A:343-476] * nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

SUBTILISIN-LIKE PROTEASE ; ligands: NAG ; X-RAY DIFFRACTION 2.5Å

e3vtaA2[A:331-468] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CUCUMISIN ; ligands: BMA,FUC,NAG ; X-RAY DIFFRACTION 2.75Å

e6hddA3[A:190-367] * nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Putative chaperonin GroEL ; ELECTRON MICROSCOPY

e6tmwA2[A:187-388] * nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Putative GroEL-like chaperonine protein ; ELECTRON MICROSCOPY

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