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4K1E

Atomic resolution crystal structures of Kallikrein-Related Peptidase 4 complexed with a modified SFTI inhibitor FCQR

Functional Information from GO Data
ChainGOidnamespacecontents
A0004252molecular_functionserine-type endopeptidase activity
A0005576cellular_componentextracellular region
A0005615cellular_componentextracellular space
A0006508biological_processproteolysis
A0008233molecular_functionpeptidase activity
A0008236molecular_functionserine-type peptidase activity
A0016787molecular_functionhydrolase activity
A0022617biological_processextracellular matrix disassembly
A0030141cellular_componentsecretory granule
A0031214biological_processbiomineral tissue development
A0046872molecular_functionmetal ion binding
A0051604biological_processprotein maturation
A0097186biological_processamelogenesis
Functional Information from PDB Data
site_idAC1
Number of Residues3
DetailsBINDING SITE FOR RESIDUE MPD A 301
ChainResidue
AASP116
ATHR117
AHOH506

site_idAC2
Number of Residues4
DetailsBINDING SITE FOR RESIDUE LI A 302
ChainResidue
AVAL34
APHE41
ATYR63
ATHR64

site_idAC3
Number of Residues26
DetailsBINDING SITE FOR CHAIN B OF TRYPSIN INHIBITOR 1
ChainResidue
ACYS42
AHIS57
ATYR94
ALEU99
AMET151
ALEU175
AASP189
ASER190
ACYS191
AASN192
AGLY193
AASP194
ASER195
ASER214
APHE215
AGLY216
ALYS217
AALA218
ACYS220
AHOH484
BHOH101
BHOH102
BHOH103
BHOH104
ALEU40
APHE41

Functional Information from PROSITE/UniProt
site_idPS00134
Number of Residues6
DetailsTRYPSIN_HIS Serine proteases, trypsin family, histidine active site. LSAAHC
ChainResidueDetails
ALEU53-CYS58

site_idPS00135
Number of Residues12
DetailsTRYPSIN_SER Serine proteases, trypsin family, serine active site. DScnGDSGGPLI
ChainResidueDetails
AASP189-ILE200

Functional Information from SwissProt/UniProt
site_idSWS_FT_FI1
Number of Residues221
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","evidences":[{"source":"PubMed","id":"16950394","evidenceCode":"ECO:0000269"}]}
ChainResidueDetails

site_idSWS_FT_FI3
Number of Residues2
DetailsBinding site: {"evidences":[{"source":"PubMed","id":"16950394","evidenceCode":"ECO:0000269"}]}
ChainResidueDetails

site_idSWS_FT_FI4
Number of Residues1
DetailsGlycosylation: {"description":"N-linked (GlcNAc...) asparagine","evidences":[{"evidenceCode":"ECO:0000255"}]}
ChainResidueDetails

site_idSWS_FT_FI5
Number of Residues13
DetailsPeptide: {"description":"Trypsin inhibitor 1","featureId":"PRO_0000042673"}
ChainResidueDetails

site_idSWS_FT_FI6
Number of Residues1
DetailsSite: {"description":"Reactive bond","evidences":[{"source":"UniProtKB","id":"P81705","evidenceCode":"ECO:0000250"}]}
ChainResidueDetails

site_idSWS_FT_FI7
Number of Residues2
DetailsCross-link: {"description":"Cyclopeptide (Gly-Asp)"}
ChainResidueDetails

247536

PDB entries from 2026-01-14

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