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1UHI

Crystal structure of i-aequorin

Functional Information from GO Data
ChainGOidnamespacecontents
A0005509molecular_functioncalcium ion binding
B0005509molecular_functioncalcium ion binding
Functional Information from PDB Data
site_idAC1
Number of Residues15
DetailsBINDING SITE FOR RESIDUE CZI A 1001
ChainResidue
AHIS16
ATYR132
ATHR166
AHIS169
ATRP173
ATYR184
AHOH1045
AMET19
ATYR82
ATRP86
AILE105
ATRP108
AGLY109
ALEU112
ATRP129

site_idAC2
Number of Residues14
DetailsBINDING SITE FOR RESIDUE CZI B 2001
ChainResidue
AHOH1298
BHIS16
BMET19
BLEU23
BTYR82
BTRP86
BILE105
BTRP108
BGLY109
BLEU112
BTYR132
BTHR166
BHIS169
BTYR184

Functional Information from PROSITE/UniProt
site_idPS00018
Number of Residues13
DetailsEF_HAND_1 EF-hand calcium-binding domain. DVNHNGKISldEM
ChainResidueDetails
AASP24-MET36
AASP117-TRP129
AASP153-MET165

Functional Information from SwissProt/UniProt
site_idSWS_FT_FI1
Number of Residues70
DetailsDomain: {"description":"EF-hand 1","evidences":[{"source":"PROSITE-ProRule","id":"PRU00448","evidenceCode":"ECO:0000255"}]}
ChainResidueDetails

site_idSWS_FT_FI2
Number of Residues108
DetailsDomain: {"description":"EF-hand 2","evidences":[{"source":"PubMed","id":"10830969","evidenceCode":"ECO:0000305"}]}
ChainResidueDetails

site_idSWS_FT_FI3
Number of Residues58
DetailsDomain: {"description":"EF-hand 3","evidences":[{"source":"PROSITE-ProRule","id":"PRU00448","evidenceCode":"ECO:0000255"}]}
ChainResidueDetails

site_idSWS_FT_FI4
Number of Residues70
DetailsDomain: {"description":"EF-hand 4","evidences":[{"source":"PROSITE-ProRule","id":"PRU00448","evidenceCode":"ECO:0000255"}]}
ChainResidueDetails

site_idSWS_FT_FI5
Number of Residues60
DetailsRegion: {"description":"May interact with the chromophore"}
ChainResidueDetails

site_idSWS_FT_FI6
Number of Residues28
DetailsBinding site: {"evidences":[{"source":"PROSITE-ProRule","id":"PRU00448","evidenceCode":"ECO:0000255"}]}
ChainResidueDetails

site_idSWS_FT_FI7
Number of Residues2
DetailsSite: {"description":"Required for bioluminescence"}
ChainResidueDetails

Catalytic Information from CSA
site_idCSA1
Number of Residues5
DetailsAnnotated By Reference To The Literature 1qv0
ChainResidueDetails
AHIS169
ATRP86
AHIS16
ATYR184
ATYR132

site_idCSA2
Number of Residues5
DetailsAnnotated By Reference To The Literature 1qv0
ChainResidueDetails
BHIS169
BTRP86
BHIS16
BTYR184
BTYR132

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PDB entries from 2026-04-01

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