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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

X: Carbonic anhydrase
H: Carbonic anhydrase
T: Carbonic anhydrase
F: Carb_anhydrase

PF00194

Representatives:

e1lugA1[A:2-260] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Carbonic Anhydrase II ; ligands: GOL,HG,MBO,SUA,ZN ; X-RAY DIFFRACTION 0.90Å

e1tbtX1[X:3-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Carbonic anhydrase II ; ligands: ZN ; X-RAY DIFFRACTION 2Å

e9ca2A1[A:5-260] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CARBONIC ANHYDRASE II ; ligands: HG,ZN ; X-RAY DIFFRACTION

e2fw4A1[A:4-260] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Carbonic anhydrase 1 ; ligands: HIS,ZN ; X-RAY DIFFRACTION 2.0Å

e1cvfA1[A:5-260] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CARBONIC ANHYDRASE II ; X-RAY DIFFRACTION

e2povA1[A:3-260] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CARBONIC ANHYDRASE 2 ; ligands: I7B,ZN ; X-RAY DIFFRACTION 1.6Å

e2fw4B1[B:5-260] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Carbonic anhydrase 1 ; ligands: HIS,ZN ; X-RAY DIFFRACTION 2.0Å

e1am6A1[A:3-261] Image Pymol Jmol Links: PDB, SCOP, CATH

CARBONIC ANHYDRASE ; ligands: HAE,HG,ZN ; X-RAY DIFFRACTION 2.0Å

e1g52A1[A:3-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CARBONIC ANHYDRASE II ; ligands: F2B,HG,ZN ; X-RAY DIFFRACTION 1.80Å

e1hugA1[A:5-260] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CARBONIC ANHYDRASE I ; ligands: AUC,ZN ; X-RAY DIFFRACTION

e1fsnB1[B:4-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CARBONIC ANHYDRASE II ; X-RAY DIFFRACTION 2Å

e1okmA1[A:4-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed,

CARBONIC ANHYDRASE II ; ligands: HG,SAB,ZN ; X-RAY DIFFRACTION 2.2Å

e2ez7A1[A:3-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Carbonic anhydrase 2 ; ligands: DHI,HG,ZN ; X-RAY DIFFRACTION 2.0Å

e1fljA1[A:1-260] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CARBONIC ANHYDRASE III ; ligands: GSH,ZN ; X-RAY DIFFRACTION 1.8Å

e2cbbA1[A:3-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CARBONIC ANHYDRASE II ; ligands: ZN ; X-RAY DIFFRACTION

e2fosA1[A:3-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Carbonic Anhydrase II ; ligands: B17,CU,ZN ; X-RAY DIFFRACTION 1.10Å

e2osfA1[A:4-260] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CARBONIC ANHYDRASE 2 ; ligands: S24,TH0,ZN ; X-RAY DIFFRACTION 1.6Å

e1xevD1[D:3-261] Image Pymol Jmol Links: PDB, SCOP, CATH

CARBONIC ANHYDRASE II ; ligands: ZN ; X-RAY DIFFRACTION 2.2Å

e1ca3A1[A:5-260] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed,

CARBONIC ANHYDRASE II ; ligands: HG,ZN ; X-RAY DIFFRACTION

e1cnbA1[A:5-260] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CARBONIC ANHYDRASE II ; ligands: BME ; X-RAY DIFFRACTION

e2it4B1[B:5-260] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Carbonic anhydrase 1 ; ligands: ZN ; X-RAY DIFFRACTION 2.0Å

e2hd6A1[A:3-260] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CARBONIC ANHYDRASE 2 ; ligands: BOS,CL,GOL,MBO,ZN ; X-RAY DIFFRACTION 1.8Å

e2nnsA1[A:3-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Carbonic anhydrase 2 ; ligands: CL,GOL,M25,ZN ; X-RAY DIFFRACTION 1.030Å

e8ca2A1[A:5-260] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CARBONIC ANHYDRASE II ; ligands: HG,ZN ; X-RAY DIFFRACTION

e2foyB1[B:5-260] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Carbonic anhydrase 1 ; ligands: B30,ZN ; X-RAY DIFFRACTION 1.55Å

e1g53A1[A:3-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CARBONIC ANHYDRASE II ; ligands: F6B,HG,ZN ; X-RAY DIFFRACTION 1.94Å

e1cvcA1[A:5-260] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed,

CARBONIC ANHYDRASE II ; ligands: ZN ; X-RAY DIFFRACTION

e1kwrA1[A:3-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Carbonic anhydrase II ; ligands: SG2,ZN ; X-RAY DIFFRACTION 2.25Å

e1cilA1[A:4-260] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed,

CARBONIC ANHYDRASE II ; ligands: ETS,ZN ; X-RAY DIFFRACTION 1.6Å

e2hocA1[A:3-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CARBONIC ANHYDRASE 2 ; ligands: 1CN,GOL,MBO,ZN ; X-RAY DIFFRACTION 2.1Å

e1ttmA1[A:3-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CARBONIC ANHYDRASE II ; ligands: 667,ZN ; X-RAY DIFFRACTION 1.95Å

e1kwqA1[A:3-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Carbonic anhydrase II ; ligands: HG,SG1,ZN ; X-RAY DIFFRACTION 2.6Å

e1cnxA1[A:4-260] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CARBONIC ANHYDRASE II ; ligands: EG2,HG,ZN ; X-RAY DIFFRACTION 1.9Å

e1cnwA1[A:4-260] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CARBONIC ANHYDRASE II ; ligands: EG1,HG,ZN ; X-RAY DIFFRACTION 2.0Å

e1rzaA1[A:3-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CARBONIC ANHYDRASE II ; ligands: CO,OXY ; X-RAY DIFFRACTION

e3betA1[A:3-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CARBONIC ANHYDRASE 2 ; ligands: CTF,GOL,ZN ; X-RAY DIFFRACTION 1.85Å

e1xegA1[A:3-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Carbonic anhydrase II ; ligands: ACT,ZN ; X-RAY DIFFRACTION 1.8Å

e2o4zA1[A:4-260] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Carbonic anhydrase 2 ; ligands: HG,HSW,ZN ; X-RAY DIFFRACTION 2.10Å

e1j9wB1[B:5-260] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CARBONIC ANHYDRASE I ; ligands: EDO,ZN ; X-RAY DIFFRACTION 2.6Å

e1fsqB1[B:3-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CARBONIC ANHYDRASE II ; ligands: CO ; X-RAY DIFFRACTION 2Å

e1cnyA1[A:4-260] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CARBONIC ANHYDRASE II ; ligands: EG3,HG,ZN ; X-RAY DIFFRACTION 2.3Å

e4cacA1[A:4-260] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CARBONIC ANHYDRASE FORM C ; ligands: ZN ; X-RAY DIFFRACTION

e6ca2A1[A:5-260] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CARBONIC ANHYDRASE II ; ligands: HG,ZN ; X-RAY DIFFRACTION

e3cyuA1[A:4-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CARBONIC ANHYDRASE 2 ; ligands: 0CR,1CR,XE,ZN ; X-RAY DIFFRACTION 1.7Å

e1eouA1[A:3-260] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CARBONIC ANHYDRASE II (CA II) ; ligands: SMS,ZN ; X-RAY DIFFRACTION 2.0Å

e2fouA1[A:3-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CARBONIC ANHYDRASE II ; ligands: B22,CU,GOL,ZN ; X-RAY DIFFRACTION 0.99Å

e1ccsA1[A:5-260] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CARBONIC ANHYDRASE II ; ligands: ZN ; X-RAY DIFFRACTION

e2fmzA1[A:4-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Carbonic anhydrase 2 ; ligands: DPN,HG,ZN ; X-RAY DIFFRACTION 1.60Å

e1i91A1[A:3-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CARBONIC ANHYDRASE II ; ligands: HG,INQ,ZN ; X-RAY DIFFRACTION 2.00Å

e1ccuA1[A:5-260] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CARBONIC ANHYDRASE II ; ligands: SO4,ZN ; X-RAY DIFFRACTION

e1g3zA1[A:3-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CARBONIC ANHYDRASE II ; ligands: HG,ZN ; X-RAY DIFFRACTION 1.86Å

e1rzcA1[A:3-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CARBONIC ANHYDRASE II ; ligands: CU,OXY ; X-RAY DIFFRACTION

e1bnnA1[A:4-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed,

CARBONIC ANHYDRASE ; ligands: AL1,HG,ZN ; X-RAY DIFFRACTION 2.3Å

e1cveA1[A:5-260] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CARBONIC ANHYDRASE II ; ligands: ZN ; X-RAY DIFFRACTION

e1v9eB1[B:1-259] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CARBONIC ANHYDRASE II ; ligands: ZN ; X-RAY DIFFRACTION 1.95Å

e1cinA1[A:4-260] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed,

CARBONIC ANHYDRASE II ; ligands: MMC,MTS,ZN ; X-RAY DIFFRACTION 2.1Å

e2nn1A1[A:5-260] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Carbonic anhydrase 1 ; ligands: M28,TRS,ZN ; X-RAY DIFFRACTION 1.650Å

e1bv3A1[A:4-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PROTEIN (CARBONIC ANHYDRASE II) ; ligands: HGB,URE,ZN ; X-RAY DIFFRACTION 1.85Å

e1czmA1[A:2-260] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CARBONIC ANHYDRASE I ; ligands: AAS,HG,ZN ; X-RAY DIFFRACTION

e1fsqA1[A:3-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CARBONIC ANHYDRASE II ; ligands: CO ; X-RAY DIFFRACTION 2Å

e1g4jA1[A:3-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CARBONIC ANHYDRASE II ; ligands: FFB,HG,ZN ; X-RAY DIFFRACTION 1.84Å

e2hl4A1[A:3-260] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CARBONIC ANHYDRASE 2 ; ligands: BO1,GOL,MBO,ZN ; X-RAY DIFFRACTION 1.55Å

e1dcbA1[A:5-260] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CARBONIC ANHYDRASE II ; ligands: ZN ; X-RAY DIFFRACTION

e1j9wA1[A:4-260] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CARBONIC ANHYDRASE I ; ligands: EDO,ZN ; X-RAY DIFFRACTION 2.6Å

e1yddA1[A:4-260] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CARBONIC ANHYDRASE II ; ligands: AZM,HG,ZN ; X-RAY DIFFRACTION

e1fqnA1[A:4-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CARBONIC ANHYDRASE ; X-RAY DIFFRACTION 2Å

e1bicA1[A:3-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CARBONIC ANHYDRASE II ; ligands: BCT,MMC,ZN ; X-RAY DIFFRACTION

e2hkkA1[A:4-259] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Carbonic anhydrase 2 ; ligands: ALE,HG,ZN ; X-RAY DIFFRACTION 1.9Å

e1te3X1[X:3-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Carbonic anhydrase II ; ligands: CL,ZN ; X-RAY DIFFRACTION 2.0Å

e1razA1[A:3-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CARBONIC ANHYDRASE II ; ligands: BR,ZN ; X-RAY DIFFRACTION

e1xevA1[A:3-261] Image Pymol Jmol Links: PDB, SCOP, CATH

CARBONIC ANHYDRASE II ; ligands: ZN ; X-RAY DIFFRACTION 2.2Å

e1t9nA1[A:3-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Carbonic anhydrase II ; ligands: SO4,ZN ; X-RAY DIFFRACTION 2Å

e1bnqA1[A:4-260] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed,

CARBONIC ANHYDRASE ; ligands: AL4,HG,ZN ; X-RAY DIFFRACTION 2.4Å

e2nnvA1[A:3-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Carbonic anhydrase 2 ; ligands: GOL,M29,ZN ; X-RAY DIFFRACTION 1.100Å

e1fqlA1[A:5-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CARBONIC ANHYDRASE ; ligands: HG,ZN ; X-RAY DIFFRACTION 2Å

e2cbcA1[A:3-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CARBONIC ANHYDRASE II ; ligands: FMT,HG,ZN ; X-RAY DIFFRACTION

e1keqA1[A:25-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

F65A/Y131C-MI Carbonic Anhydrase V ; ligands: 4MZ,ACY,K,ZN ; X-RAY DIFFRACTION 1.85Å

e3zncA1[A:5-259] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed,

CARBONIC ANHYDRASE IV ; ligands: BZ1,ZN ; X-RAY DIFFRACTION 2.8Å

e2zncA1[A:5-259] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed,

CARBONIC ANHYDRASE IV ; ligands: ZN ; X-RAY DIFFRACTION 2.8Å

e1zncB1[B:5-259] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CARBONIC ANHYDRASE IV ; ligands: SO4,ZN ; X-RAY DIFFRACTION 2.8Å

e1rj6B1[B:5-260] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CARBONIC ANHYDRASE XIV ; ligands: AZM,ZN ; X-RAY DIFFRACTION 2.9Å

e1rj5A1[A:4-260] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CARBONIC ANHYDRASE XIV ; ligands: ACY,ZN ; X-RAY DIFFRACTION 2.81Å

e1rj6A1[A:4-260] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CARBONIC ANHYDRASE XIV ; ligands: AZM,ZN ; X-RAY DIFFRACTION 2.9Å

e1rj5B1[B:5-260] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CARBONIC ANHYDRASE XIV ; ligands: ACY,ZN ; X-RAY DIFFRACTION 2.81Å

e1jczA1[A:4-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CARBONIC ANHYDRASE XII ; ligands: ACY,ZN ; X-RAY DIFFRACTION 1.55Å

e1jd0B1[B:5-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CARBONIC ANHYDRASE XII ; ligands: AZM,ZN ; X-RAY DIFFRACTION 1.5Å

e1jczB1[B:4-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CARBONIC ANHYDRASE XII ; ligands: ACY,ZN ; X-RAY DIFFRACTION 1.55Å

e1koqB1[B:6-226] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CARBONIC ANHYDRASE ; ligands: ZN ; X-RAY DIFFRACTION 1.9Å

e1koqA1[A:5-226] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CARBONIC ANHYDRASE ; ligands: ZN ; X-RAY DIFFRACTION 1.9Å

e1kopB1[B:4-226] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CARBONIC ANHYDRASE ; ligands: AZI,BME,SO4,ZN ; X-RAY DIFFRACTION 1.9Å

e3mdzA1[A:4-262] Image Pymol Jmol Links: PDB, SCOP, CATH

Carbonic anhydrase 7 ; ligands: EZL,GOL,ZN ; X-RAY DIFFRACTION 2.32Å

e3kigA1[A:3-259] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Carbonic anhydrase 2 ; ligands: DA4,DA9,ZN ; X-RAY DIFFRACTION 1.39Å

e3uyqA1[A:2-260] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Carbonic anhydrase 3 ; ligands: ZN ; X-RAY DIFFRACTION 1.70Å

e3q31A1[A:35-270] Image Pymol Jmol Links: PDB, SCOP, CATH

Carbonic anhydrase ; ligands: MLT,NAG,ZN ; X-RAY DIFFRACTION 2.7Å

e3lxeA1[A:5-260] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CARBONIC ANHYDRASE 1 ; ligands: TOR,ZN ; X-RAY DIFFRACTION 1.9Å

e3f7bA1[A:2-259] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CARBONIC ANHYDRASE 4 ; ligands: AG5,ZN ; X-RAY DIFFRACTION 2.05Å

e3iaiA1[A:0-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Carbonic anhydrase 9 ; ligands: AZM,GOL,PO4,TRS,ZN ; X-RAY DIFFRACTION 2.20Å

e3jxgA1[A:58-320] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Receptor-type tyrosine-protein phosphatase gamma ; X-RAY DIFFRACTION 1.700Å

e3jxfA1[A:34-301] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Receptor-type tyrosine-protein phosphatase zeta ; X-RAY DIFFRACTION 2.000Å

e3s97A1[A:36-301] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Receptor-type tyrosine-protein phosphatase zeta ; X-RAY DIFFRACTION 2.2970Å

e3pjjA1[A:3-261] Image Pymol Jmol Links: PDB, SCOP, CATH

Carbonic anhydrase 2 ; ligands: MZH,ZN ; X-RAY DIFFRACTION 1.5Å

e3rldA1[A:1-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Carbonic anhydrase 2 ; ligands: SO4,ZN ; X-RAY DIFFRACTION 1.500Å

e3rg3A1[A:1-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Carbonic anhydrase 2 ; ligands: ZN ; X-RAY DIFFRACTION 1.900Å

e3rg4A1[A:1-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Carbonic anhydrase 2 ; ligands: ZN ; X-RAY DIFFRACTION 1.500Å

e3rgeA1[A:1-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Carbonic anhydrase 2 ; ligands: ZN ; X-RAY DIFFRACTION 2.096Å

e3rj7A1[A:3-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Carbonic anhydrase 2 ; ligands: DMS,MBO,RCS,ZN ; X-RAY DIFFRACTION 1.2Å

e3qykA1[A:1-261] Image Pymol Jmol Links: PDB, SCOP, CATH

Carbonic anhydrase 2 ; ligands: DMS,IE2,ZN ; X-RAY DIFFRACTION 1.469Å

e3v7xA1[A:1002-1261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CARBONIC ANHYDRASE 2 ; ligands: D7A,GOL,MBO,ZN ; X-RAY DIFFRACTION 1.03Å

e3s8xA1[A:1-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Carbonic anhydrase 2 ; ligands: BCN,DMS,E59,ZN ; X-RAY DIFFRACTION 1.300Å

e3s9tA1[A:1-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Carbonic anhydrase 2 ; ligands: BCN,DMS,E49,ZN ; X-RAY DIFFRACTION 1.300Å

e3v3fA1[A:1-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Carbonic anhydrase 2 ; ligands: CL,ZN ; X-RAY DIFFRACTION 1.800Å

e4e3dA1[A:1-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CARBONIC ANHYDRASE 2 ; ligands: GOL,GTQ,MBO,ZN ; X-RAY DIFFRACTION 1.6Å

e3v5gA1[A:1-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CARBONIC ANHYDRASE 2 ; ligands: 0F3,HGB,MBO,ZN ; X-RAY DIFFRACTION 1.5Å

e3tvnX1[X:3-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Carbonic anhydrase 2 ; ligands: ZN ; X-RAY DIFFRACTION 1.497Å

e4fl7A1[A:2-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CARBONIC ANHYDRASE 2 ; ligands: BHO,GOL,MBO,ZN ; X-RAY DIFFRACTION 1.85Å

e4g0cA1[A:4-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Carbonic anhydrase 2 ; ligands: AZM,ZN ; NEUTRON DIFFRACTION 2Å

e3u3aX1[X:1-261] Image Pymol Jmol Links: PDB, SCOP, CATH

Carbonic anhydrase 2 ; ligands: GOL,ZN ; X-RAY DIFFRACTION 1.549Å

e4idrX1[X:3-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Carbonic anhydrase 2 ; ligands: GOL,ZN ; X-RAY DIFFRACTION 1.6Å

e4e9oX1[X:2-234] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

IMV MEMBRANE PROTEIN ; ligands: IOD ; X-RAY DIFFRACTION 1.42Å

e3uynA1[A:2-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Carbonic anhydrase 3 ; ligands: ZN ; X-RAY DIFFRACTION 2.6Å

e3fe4A1[A:32-279] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Carbonic anhydrase 6 ; ligands: GOL,MG ; X-RAY DIFFRACTION 1.9Å

e1y7wA1[A:3-276] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HALOTOLERANT ALPHA-TYPE CARBONIC ANHYDRASE (DCA II) ; ligands: ACY,NA,ZN ; X-RAY DIFFRACTION 1.86Å

e2w2jA1[A:23-290] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CARBONIC ANHYDRASE-RELATED PROTEIN ; ligands: CL,GOL,UNX ; X-RAY DIFFRACTION 1.6Å

e2hfwA1[A:4-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Carbonic anhydrase 3 ; ligands: ZN ; X-RAY DIFFRACTION 2.5Å

e3czvA1[A:4-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Carbonic anhydrase 13 ; ligands: AZM,ZN ; X-RAY DIFFRACTION 2.00Å

e3oy0A1[A:4-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Carbonic anhydrase 2 ; ligands: DMS,GOL,OY0,ZN ; X-RAY DIFFRACTION 1.600Å

e4bcwA1[A:4-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CARBONIC ANHYDRASE 2 ; ligands: TU0,ZN ; X-RAY DIFFRACTION 1.50Å

e3u7cA1[A:3-261] Image Pymol Jmol Links: PDB, SCOP, CATH

CARBONIC ANHYDRASE 2 ; ligands: BCT,CO2,GOL,ZN ; X-RAY DIFFRACTION 0.93Å

e3w6hA1[A:5-260] Image Pymol Jmol Links: PDB, SCOP, CATH

CARBONIC ANHYDRASE 1 ; ligands: AZM,FLB,ZN ; X-RAY DIFFRACTION 2.96Å

e4ht0A1[A:4-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Carbonic anhydrase 2 ; ligands: DMS,MES,V50,ZN ; X-RAY DIFFRACTION 1.600Å

e4ht2A1[A:3-263] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CARBONIC ANHYDRASE 12 ; ligands: EDO,PEG,V50,ZN ; X-RAY DIFFRACTION 1.45Å

e4dz7A1[A:4-261] Image Pymol Jmol Links: PDB, SCOP, CATH

Carbonic anhydrase 2 ; ligands: D02,DMS,ZN ; X-RAY DIFFRACTION 1.490Å

e2fnkA1[A:3-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Carbonic anhydrase 2 ; ligands: ZN ; X-RAY DIFFRACTION 1.8Å

e2fnmA1[A:3-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

carbonic anhydrase 2 ; ligands: ZN ; X-RAY DIFFRACTION 1.8Å

e2fnnA1[A:3-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Carbonic Anhydrase 2 ; ligands: 4MZ,ZN ; X-RAY DIFFRACTION 1.8Å

e1zh9A1[A:4-260] Image Pymol Jmol Links: PDB, SCOP, CATH

Carbonic anhydrase II ; ligands: BE7,MPX,ZN ; X-RAY DIFFRACTION 1.70Å

e1tg3A1[A:3-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Carbonic anhydrase II ; ligands: SO4,ZN ; X-RAY DIFFRACTION 1.8Å

e1tg9A1[A:3-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Carbonic anhydrase II ; ligands: ZN ; X-RAY DIFFRACTION 1.9Å

e1th9A1[A:3-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Carbonic anhydrase II ; ligands: SO4,ZN ; X-RAY DIFFRACTION 1.63Å

e1thkA1[A:3-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Carbonic anhydrase II ; ligands: ZN ; X-RAY DIFFRACTION 1.8Å

e1yo0A1[A:3-260] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Carbonic anhydrase II ; ligands: CL,ZN ; X-RAY DIFFRACTION 1.8Å

e1yo1A1[A:3-260] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Carbonic anhydrase II ; ligands: SO4,ZN ; X-RAY DIFFRACTION 1.7Å

e1yo2A1[A:3-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Carbonic anhydrase II ; ligands: ZN ; X-RAY DIFFRACTION 1.80Å

e1z93A1[A:4-267] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Carbonic anhydrase III ; ligands: ZN ; X-RAY DIFFRACTION 2.1Å

e1z97A1[A:4-267] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Carbonic anhydrase III ; ligands: ZN ; X-RAY DIFFRACTION 2.1Å

e1y7wB1[B:3-276] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HALOTOLERANT ALPHA-TYPE CARBONIC ANHYDRASE (DCA II) ; ligands: ACY,NA,ZN ; X-RAY DIFFRACTION 1.86Å

e3f4xA1[A:4-260] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Carbonic anhydrase 2 ; ligands: HG,KLT,ZN ; X-RAY DIFFRACTION 1.9Å

e2nwoA1[A:3-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Carbonic anhydrase 2 ; ligands: ZN ; X-RAY DIFFRACTION 1.7Å

e2nwpA1[A:3-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

carbonic anhydrase 2 ; ligands: SO4,ZN ; X-RAY DIFFRACTION 1.8Å

e2nwyA1[A:3-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

carbonic anhydrase 2 ; ligands: ZN ; X-RAY DIFFRACTION 1.65Å

e2nwzA1[A:3-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

carbonic anhydrase 2 ; ligands: SO4,ZN ; X-RAY DIFFRACTION 1.8Å

e2nxrA1[A:3-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

carbonic anhydrase 2 ; ligands: SO4,ZN ; X-RAY DIFFRACTION 1.7Å

e2nxsA1[A:3-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

carbonic anhydrase 2 ; ligands: SO4,ZN ; X-RAY DIFFRACTION 1.8Å

e2nxtA1[A:3-260] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

carbonic anhydrase 2 ; ligands: ZN ; X-RAY DIFFRACTION 1.15Å

e3dv7A1[A:3-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Carbonic anhydrase 2 ; ligands: ZN ; X-RAY DIFFRACTION 1.7Å

e3dvbA1[A:3-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Carbonic anhydrase 2 ; ligands: ZN ; X-RAY DIFFRACTION 1.5Å

e3dvcA1[A:3-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Carbonic anhydrase 2 ; ligands: ZN ; X-RAY DIFFRACTION 1.6Å

e3dvdA1[A:3-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Carbonic anhydrase 2 ; ligands: ZN ; X-RAY DIFFRACTION 1.6Å

e3c7pA1[A:3-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Carbonic anhydrase 2 ; ligands: CL,GOL,MBO,POF,ZN ; X-RAY DIFFRACTION 1.70Å

e3d8wA1[A:4-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Carbonic anhydrase II ; ligands: D8W,ZN ; X-RAY DIFFRACTION 1.70Å

e3d9zA1[A:4-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CARBONIC ANHYDRASE 2 ; ligands: D9Z,ZN ; X-RAY DIFFRACTION 1.65Å

e3dazA1[A:4-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Carbonic anhydrase 2 ; ligands: MZM,ZN ; X-RAY DIFFRACTION 1.600Å

e3dd0A1[A:3-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CARBONIC ANHYDRASE 2 ; ligands: EZL,ZN ; X-RAY DIFFRACTION 1.48Å

e3fe4B1[B:33-280] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Carbonic anhydrase 6 ; ligands: GOL,MG ; X-RAY DIFFRACTION 1.9Å

e3da2A1[A:0-261] Image Pymol Jmol Links: PDB, SCOP, CATH

Carbonic anhydrase 13 ; ligands: 4MD,ZN ; X-RAY DIFFRACTION 2.05Å

e3da2B1[B:5-261] Image Pymol Jmol Links: PDB, SCOP, CATH

Carbonic anhydrase 13 ; ligands: 4MD,CL,ZN ; X-RAY DIFFRACTION 2.05Å

e3czvB1[B:3-260] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Carbonic anhydrase 13 ; ligands: AZM,GOL,ZN ; X-RAY DIFFRACTION 2.00Å

e3d0nA1[A:0A-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Carbonic anhydrase 13 ; ligands: ACT,GOL,ZN ; X-RAY DIFFRACTION 1.55Å

e3d0nB1[B:0A-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Carbonic anhydrase 13 ; ligands: ACT,GOL,ZN ; X-RAY DIFFRACTION 1.55Å

e3dbuA1[A:4-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Carbonic anhydrase 2 ; ligands: D8W,ZN ; X-RAY DIFFRACTION 1.7Å

e3dc3A1[A:4-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Carbonic anhydrase 2 ; ligands: AZM,ZN ; X-RAY DIFFRACTION 1.7Å

e3dc9A1[A:4-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Carbonic anhydrase 2 ; ligands: ZN ; X-RAY DIFFRACTION 1.6Å

e3dccA1[A:4-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Carbonic anhydrase 2 ; ligands: D9Z,ZN ; X-RAY DIFFRACTION 1.60Å

e3dcsA1[A:4-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Carbonic anhydrase 2 ; ligands: MZM,ZN ; X-RAY DIFFRACTION 1.8Å

e3dcwA1[A:4-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Carbonic anhydrase 2 ; ligands: EZL,ZN ; X-RAY DIFFRACTION 1.50Å

e3koiA1[A:5-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Carbonic anhydrase 2 ; ligands: 3CO ; X-RAY DIFFRACTION 1.6Å

e3ffpX1[X:4-260] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Carbonic anhydrase 2 ; ligands: BEZ,HG,LC1,ZN ; X-RAY DIFFRACTION 1.81Å

e3eftA1[A:4-260] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Carbonic anhydrase 2 ; ligands: 3BS,HG,ZN ; X-RAY DIFFRACTION 1.84Å

e3ibiA1[A:3-260] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CARBONIC ANHYDRASE 2 ; ligands: BOW,CL,HGB,ZN ; X-RAY DIFFRACTION 1.93Å

e3f8eA1[A:4-260] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Carbonic anhydrase 2 ; ligands: BEZ,HG,TE1,ZN ; X-RAY DIFFRACTION 2.0Å

e3k2fA1[A:4-260] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Carbonic anhydrase 2 ; ligands: HG,NKX,ZN ; X-RAY DIFFRACTION 1.98Å

e3ieoA1[A:4-260] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Carbonic anhydrase 2 ; ligands: AMJ,BEZ,HG,ZN ; X-RAY DIFFRACTION 2.0Å

e2wd2A1[A:3-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CARBONIC ANHYDRASE 2 ; ligands: FMT,MS5,ZN ; X-RAY DIFFRACTION 1.49Å

e2x7sA1[A:4-260] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CARBONIC ANHYDRASE 2 ; ligands: GOL,WZC,ZN ; X-RAY DIFFRACTION 1.64Å

e3hfpA1[A:4-260] Image Pymol Jmol Links: PDB, SCOP, CATH

Carbonic anhydrase 2 ; ligands: HG,MIZ,ZN ; X-RAY DIFFRACTION 2.09Å

e3kwaA1[A:4-260] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Carbonic anhydrase 2 ; ligands: HG,SPM,ZN ; X-RAY DIFFRACTION 2.0Å

e3mhoA1[A:4-260] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Carbonic anhydrase 2 ; ligands: DMS,J43,UNL,ZN ; X-RAY DIFFRACTION 1.15Å

e2vvaX1[X:3-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CARBONIC ANHYDRASE 2 ; ligands: CO2,GOL,SO4,ZN ; X-RAY DIFFRACTION 1.56Å

e2vvbX1[X:3-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CARBONIC ANHYDRASE 2 ; ligands: BCT,CO2,GOL,SO4,ZN ; X-RAY DIFFRACTION 1.66Å

e3gz0A1[A:4-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CARBONIC ANHYDRASE 2 ; ligands: ZN ; X-RAY DIFFRACTION 1.26Å

e3iblA1[A:3-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CARBONIC ANHYDRASE 2 ; ligands: HGB,O59,ZN ; X-RAY DIFFRACTION 1.55Å

e3ibnA1[A:3-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CARBONIC ANHYDRASE 2 ; ligands: CL,HGB,O60,ZN ; X-RAY DIFFRACTION 2.2Å

e3ibuA1[A:3-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CARBONIC ANHYDRASE 2 ; ligands: CL,HGB,O48,ZN ; X-RAY DIFFRACTION 1.41Å

e3hknA1[A:4-260] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Carbonic anhydrase 2 ; ligands: GOL,MFS,ZN ; X-RAY DIFFRACTION 1.8Å

e3hkqA1[A:4-260] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Carbonic anhydrase 2 ; ligands: 1SD,GOL,ZN ; X-RAY DIFFRACTION 1.7Å

e3hktA1[A:4-260] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Carbonic anhydrase 2 ; ligands: 2SD,ZN ; X-RAY DIFFRACTION 2.36Å

e3hkuA1[A:4-260] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Carbonic anhydrase 2 ; ligands: TOR,ZN ; X-RAY DIFFRACTION 1.8Å

e2wegA1[A:3-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CARBONIC ANHYDRASE 2 ; ligands: FBV,GOL,ZN ; X-RAY DIFFRACTION 1.1Å

e2wehA1[A:3-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CARBONIC ANHYDRASE 2 ; ligands: FB1,GOL,ZN ; X-RAY DIFFRACTION 2.1Å

e2wejA1[A:3-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CARBONIC ANHYDRASE 2 ; ligands: FB2,GOL,ZN ; X-RAY DIFFRACTION 1.45Å

e2weoA1[A:4-261] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CARBONIC ANHYDRASE 2 ; ligands: DMS,FBW,GOL,ZN ; X-RAY DIFFRACTION 1.4Å

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e1jd0A1[A:4-261] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CARBONIC ANHYDRASE XII ; ligands: AZM,ZN ; X-RAY DIFFRACTION 1.5Å

e1kopA1[A:4-226] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CARBONIC ANHYDRASE ; ligands: AZI,BME,SO4,ZN ; X-RAY DIFFRACTION 1.9Å

e1zncA1[A:5-259] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CARBONIC ANHYDRASE IV ; ligands: SO4,ZN ; X-RAY DIFFRACTION 2.8Å

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

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