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3M7Q

Crystal structure of recombinant Kunitz Type serine protease Inhibitor-1 from the Caribbean sea anemone stichodactyla helianthus in complex with bovine pancreatic trypsin

Functional Information from GO Data
ChainGOidnamespacecontents
A0004175molecular_functionendopeptidase activity
A0004252molecular_functionserine-type endopeptidase activity
A0005515molecular_functionprotein binding
A0005576cellular_componentextracellular region
A0005615cellular_componentextracellular space
A0006508biological_processproteolysis
A0007586biological_processdigestion
A0008233molecular_functionpeptidase activity
A0008236molecular_functionserine-type peptidase activity
A0016787molecular_functionhydrolase activity
A0046872molecular_functionmetal ion binding
A0097180cellular_componentserine protease inhibitor complex
A0097655molecular_functionserpin family protein binding
B0004867molecular_functionserine-type endopeptidase inhibitor activity
B0005576cellular_componentextracellular region
B0005615cellular_componentextracellular space
B0008200molecular_functionion channel inhibitor activity
B0019828molecular_functionaspartic-type endopeptidase inhibitor activity
B0030414molecular_functionpeptidase inhibitor activity
B0042151cellular_componentnematocyst
Functional Information from PDB Data
site_idAC1
Number of Residues11
DetailsBINDING SITE FOR RESIDUE PO4 A 224
ChainResidue
AASN82
AHOH513
AHOH563
ATHR124
ALYS136
AHOH277
AHOH289
AHOH355
AHOH452
AHOH490
AHOH493

Functional Information from PROSITE/UniProt
site_idPS00134
Number of Residues6
DetailsTRYPSIN_HIS Serine proteases, trypsin family, histidine active site. VSAAHC
ChainResidueDetails
AVAL36-CYS41

site_idPS00135
Number of Residues12
DetailsTRYPSIN_SER Serine proteases, trypsin family, serine active site. DScqGDSGGPVV
ChainResidueDetails
AASP171-VAL182

site_idPS00280
Number of Residues19
DetailsBPTI_KUNITZ_1 Pancreatic trypsin inhibitor (Kunitz) family signature. FiyGGCggngnnFetlhqC
ChainResidueDetails
BPHE31-CYS49

Functional Information from SwissProt/UniProt
site_idSWS_FT_FI1
Number of Residues220
DetailsDomain: {"description":"Peptidase S1","evidences":[{"source":"PROSITE-ProRule","id":"PRU00274","evidenceCode":"ECO:0000255"}]}
ChainResidueDetails

site_idSWS_FT_FI2
Number of Residues3
DetailsActive site: {"description":"Charge relay system"}
ChainResidueDetails

site_idSWS_FT_FI3
Number of Residues7
DetailsBinding site: {}
ChainResidueDetails

site_idSWS_FT_FI4
Number of Residues50
DetailsDomain: {"description":"BPTI/Kunitz inhibitor","evidences":[{"source":"PROSITE-ProRule","id":"PRU00031","evidenceCode":"ECO:0000255"}]}
ChainResidueDetails

site_idSWS_FT_FI5
Number of Residues1
DetailsSite: {"description":"Reactive bond for trypsin","evidences":[{"source":"PubMed","id":"22975140","evidenceCode":"ECO:0000269"}]}
ChainResidueDetails

239149

PDB entries from 2025-07-23

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