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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

X: Coronavirus spike protein receptor-binding domain
H: Coronavirus spike protein receptor-binding domain
T: Beta-coronavirus spike protein receptor-binding domain
F: bCoV_S1_RBD

PF09408

Representatives:

e5gyqA1[A:3-171] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Spike glycoprotein ; ligands: NAG ; X-RAY DIFFRACTION 2.10Å

e2ghvC1[C:320-502] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

SPIKE GLYCOPROTEIN ; X-RAY DIFFRACTION 2.2Å

e8fu9C2[C:309-509] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Spike glycoprotein ; ligands: NAG ; ELECTRON MICROSCOPY

e8gjmB3[B:329-529] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Spike glycoprotein ; ligands: NAG ; ELECTRON MICROSCOPY

e8h00A1[A:329-529] Image Pymol Jmol Links: PDB, SCOP, CATHDOI

Spike glycoprotein ; ligands: NAG ; ELECTRON MICROSCOPY

e8h00B4[B:329-529] Image Pymol Jmol Links: PDB, SCOP, CATHDOI

Spike glycoprotein ; ligands: NAG ; ELECTRON MICROSCOPY

e8h00C1[C:329-529] Image Pymol Jmol Links: PDB, SCOP, CATHDOI

Spike glycoprotein ; ligands: NAG ; ELECTRON MICROSCOPY

e8h01A2[A:329-529] Image Pymol Jmol Links: PDB, SCOP, CATHDOI

Spike glycoprotein ; ligands: NAG ; ELECTRON MICROSCOPY

e8h01B3[B:329-529] Image Pymol Jmol Links: PDB, SCOP, CATHDOI

Spike glycoprotein ; ELECTRON MICROSCOPY

e8h01C3[C:329-529] Image Pymol Jmol Links: PDB, SCOP, CATHDOI

Spike glycoprotein ; ligands: NAG ; ELECTRON MICROSCOPY

e8h3nC2[C:329-529] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Spike glycoprotein ; ligands: NAG ; ELECTRON MICROSCOPY

e8hebA4[A:329-529] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Spike glycoprotein ; ligands: NAG ; ELECTRON MICROSCOPY

e8hebB4[B:329-529] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Spike glycoprotein ; ligands: NAG ; ELECTRON MICROSCOPY

e8hebC1[C:329-529] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Spike glycoprotein ; ligands: NAG ; ELECTRON MICROSCOPY

e8hecA1[A:329-529] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Spike glycoprotein ; ligands: NAG ; ELECTRON MICROSCOPY

e8hecB2[B:329-529] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Spike glycoprotein ; ligands: NAG ; ELECTRON MICROSCOPY

e8hecC3[C:329-529] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Spike glycoprotein ; ligands: NAG ; ELECTRON MICROSCOPY

e8iotA3[A:329-529] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Spike glycoprotein ; ligands: NAG ; ELECTRON MICROSCOPY

e8iotB3[B:329-529] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Spike glycoprotein ; ligands: NAG ; ELECTRON MICROSCOPY

e8iotC2[C:329-529] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Spike glycoprotein ; ligands: NAG ; ELECTRON MICROSCOPY

e8iouA2[A:329-529] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Spike glycoprotein ; ligands: NAG ; ELECTRON MICROSCOPY

e8iouB4[B:329-469,B:490-529] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Spike glycoprotein ; ELECTRON MICROSCOPY

e8iouC3[C:329-470,C:490-529] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Spike glycoprotein ; ELECTRON MICROSCOPY

e8ituA2[A:329-529] Image Pymol Jmol Links: PDB, SCOP, CATHDOI

Spike glycoprotein ; ligands: NAG ; ELECTRON MICROSCOPY

e8ituB2[B:329-529] Image Pymol Jmol Links: PDB, SCOP, CATHDOI

Spike glycoprotein ; ELECTRON MICROSCOPY

e8ituC3[C:329-529] Image Pymol Jmol Links: PDB, SCOP, CATHDOI

Spike glycoprotein ; ligands: NAG ; ELECTRON MICROSCOPY

e7uowA1[A:329-529] Image Pymol Jmol Links: PDB, SCOP, CATH

Spike glycoprotein ; ligands: NAG ; ELECTRON MICROSCOPY

e7uowB1[B:329-529] Image Pymol Jmol Links: PDB, SCOP, CATH

Spike glycoprotein ; ligands: NAG ; ELECTRON MICROSCOPY

e7uowC3[C:329-529] Image Pymol Jmol Links: PDB, SCOP, CATH

Spike glycoprotein ; ligands: NAG ; ELECTRON MICROSCOPY

e7xdlA3[A:312-512] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Spike glycoprotein ; ELECTRON MICROSCOPY

e7xdlB2[B:312-512] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Spike glycoprotein ; ELECTRON MICROSCOPY

e7xdlC3[C:312-512] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Spike glycoprotein ; ELECTRON MICROSCOPY

e7xj6A4[A:329-529] Image Pymol Jmol Links: PDB, SCOP, CATH

Spike glycoprotein ; ligands: NAG ; ELECTRON MICROSCOPY

e7xj6B4[B:329-529] Image Pymol Jmol Links: PDB, SCOP, CATH

Spike glycoprotein ; ligands: NAG ; ELECTRON MICROSCOPY

e7xj6C4[C:329-529] Image Pymol Jmol Links: PDB, SCOP, CATH

Spike glycoprotein ; ligands: NAG ; ELECTRON MICROSCOPY

e7xj8B3[B:329-529] Image Pymol Jmol Links: PDB, SCOP, CATH

Spike glycoprotein ; ligands: NAG ; ELECTRON MICROSCOPY

e7xj8C1[C:329-529] Image Pymol Jmol Links: PDB, SCOP, CATH

Spike glycoprotein ; ligands: NAG ; ELECTRON MICROSCOPY

e7zjlA2[A:329-529] Image Pymol Jmol Links: PDB, SCOP, CATH

Spike glycoprotein ; ELECTRON MICROSCOPY

e7zjlB3[B:329-529] Image Pymol Jmol Links: PDB, SCOP, CATH

Spike glycoprotein ; ELECTRON MICROSCOPY

e7zjlC2[C:329-529] Image Pymol Jmol Links: PDB, SCOP, CATH

Spike glycoprotein ; ELECTRON MICROSCOPY

e8csjA1[A:329-529] Image Pymol Jmol Links: PDB, SCOP, CATH

Spike glycoprotein ; ligands: NAG ; ELECTRON MICROSCOPY

e8csjB2[B:329-529] Image Pymol Jmol Links: PDB, SCOP, CATH

Spike glycoprotein ; ligands: NAG ; ELECTRON MICROSCOPY

e8csjC2[C:329-529] Image Pymol Jmol Links: PDB, SCOP, CATH

Spike glycoprotein ; ligands: NAG ; ELECTRON MICROSCOPY

e8fu8C4[C:313-513] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Spike glycoprotein ; ligands: NAG ; ELECTRON MICROSCOPY

e8gjmA2[A:329-529] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Spike glycoprotein ; ELECTRON MICROSCOPY

e8gjmC4[C:329-529] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Spike glycoprotein ; ligands: NAG ; ELECTRON MICROSCOPY

e8h3dA3[A:329-529] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Spike glycoprotein,Fibritin ; ELECTRON MICROSCOPY

e8h3dB3[B:329-529] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Spike glycoprotein,Fibritin ; ligands: NAG ; ELECTRON MICROSCOPY

e8h3dC2[C:329-529] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Spike glycoprotein,Fibritin ; ligands: NAG ; ELECTRON MICROSCOPY

e8h3eA1[A:329-529] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Spike glycoprotein,Fibritin ; ligands: NAG,Q83 ; ELECTRON MICROSCOPY

e8h3eB3[B:329-529] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Spike glycoprotein,Fibritin ; ligands: NAG,Q83 ; ELECTRON MICROSCOPY

e8h3eC3[C:329-529] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Spike glycoprotein,Fibritin ; ligands: NAG,Q83 ; ELECTRON MICROSCOPY

e8h3nA4[A:329-529] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Spike glycoprotein ; ligands: NAG ; ELECTRON MICROSCOPY

e8iosA3[A:329-529] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Spike glycoprotein ; ligands: NAG ; ELECTRON MICROSCOPY

e8iosB3[B:329-529] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Spike glycoprotein ; ligands: NAG ; ELECTRON MICROSCOPY

e8iosC1[C:329-529] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Spike glycoprotein ; ligands: NAG ; ELECTRON MICROSCOPY

e8cwkC1[C:333-531] Image Pymol Jmol Links: PDB, SCOP, CATH

Spike protein S1 ; ligands: GOL,NAG ; X-RAY DIFFRACTION 2.3680Å

e7yv8B1[B:332-528] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ligands: NAG ; ELECTRON MICROSCOPY

e8sphF1[F:331-527] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; X-RAY DIFFRACTION 2.706Å

e8gf2A1[A:334-528] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ligands: NAG ; X-RAY DIFFRACTION 2.850Å

e7yr4D1[D:334-528] Image Pymol Jmol Links: PDB, SCOP, CATH

; ELECTRON MICROSCOPY

e8edfA1[A:334-529] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ligands: NAG ; X-RAY DIFFRACTION 3.4Å

e8fxcE1[E:334-527] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ELECTRON MICROSCOPY

e8eqfA1[A:326-519] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Spike protein S1 ; ELECTRON MICROSCOPY

e8h5uC1[C:334-532] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ligands: NAG ; X-RAY DIFFRACTION 2.40Å

e8gsbA1[A:338-517] Image Pymol Jmol Links: PDB, SCOP, CATH

; ELECTRON MICROSCOPY

e8dt8A4[A:329-529] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ligands: NAG ; ELECTRON MICROSCOPY

e8epqA4[A:329-529] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ligands: NAG ; ELECTRON MICROSCOPY

e8bonB4[B:329-529] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ligands: NAG ; ELECTRON MICROSCOPY

e8eljA4[A:329-529] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ligands: NAG ; ELECTRON MICROSCOPY

e7y71A1[A:329-529] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ELECTRON MICROSCOPY

e7y20B2[B:329-454,B:491-529] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ELECTRON MICROSCOPY

e8a95A4[A:329-529] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ligands: NAG ; ELECTRON MICROSCOPY

e7ybkB4[B:329-529] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Spike glycoprotein ; ligands: NAG ; ELECTRON MICROSCOPY

e7xy3A4[A:329-529] Image Pymol Jmol Links: PDB, SCOP, CATH

; ELECTRON MICROSCOPY

e7uklB4[B:329-529] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ligands: NAG ; ELECTRON MICROSCOPY

e8d55A1[A:329-529] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ligands: NAG ; ELECTRON MICROSCOPY

e7yc5A1[A:329-529] Image Pymol Jmol Links: PDB, SCOP, CATHDOI

; ligands: NAG ; ELECTRON MICROSCOPY

e8cimA1[A:326-526] Image Pymol Jmol Links: PDB, SCOP, CATHDOI

; ligands: NAG ; ELECTRON MICROSCOPY

e7ybjA3[A:329-529] Image Pymol Jmol Links: PDB, SCOP, CATH

; ELECTRON MICROSCOPY

e7ybmA3[A:329-529] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Spike glycoprotein ; ligands: NAG ; ELECTRON MICROSCOPY

e8ajaA2[A:321-503] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ligands: NAG ; ELECTRON MICROSCOPY

e8ajlA2[A:323-522] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ligands: NAG ; ELECTRON MICROSCOPY

e8gnhB2[B:329-529] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Spike glycoprotein ; ligands: NAG ; ELECTRON MICROSCOPY

e8p9yB2[B:329-529] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ELECTRON MICROSCOPY

e8tazB1[B:329-529] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ELECTRON MICROSCOPY

e8ohnA4[A:307-611] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ligands: NAG ; ELECTRON MICROSCOPY

e7ymtA3[A:353-591] Image Pymol Jmol Links: PDB, SCOP, CATH

; ELECTRON MICROSCOPY

e8sakA4[A:357-595] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ligands: NAG ; ELECTRON MICROSCOPY

e8hc6C1[C:322-588] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Spike protein S1 ; ligands: NAG ; ELECTRON MICROSCOPY

e8hc7A1[A:322-588] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Spike protein S1 ; ligands: NAG ; ELECTRON MICROSCOPY

Previous

e5gnbA1[A:322-611] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Spike glycoprotein ; ligands: NAG ; X-RAY DIFFRACTION 2.3Å

e3jclA2[A:322-569] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Spike glycoprotein ; ELECTRON MICROSCOPY

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.

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