ITR3_CYCPE
ID ITR3_CYCPE Reviewed; 29 AA.
AC P83394; P83392;
DT 01-NOV-2002, integrated into UniProtKB/Swiss-Prot.
DT 01-OCT-2002, sequence version 1.
DT 25-MAY-2022, entry version 72.
DE RecName: Full=Trypsin inhibitor 3 {ECO:0000303|PubMed:14515156, ECO:0000303|PubMed:16635550};
DE AltName: Full=CyPTI-III {ECO:0000303|PubMed:14515156, ECO:0000303|PubMed:16635550};
DE AltName: Full=Trypsin inhibitor III {ECO:0000303|PubMed:14515156, ECO:0000303|PubMed:16635550};
DE Contains:
DE RecName: Full=Trypsin inhibitor 1 {ECO:0000303|PubMed:14515156, ECO:0000303|PubMed:16635550};
DE AltName: Full=CyPTI-I {ECO:0000303|PubMed:14515156, ECO:0000303|PubMed:16635550};
DE AltName: Full=Trypsin inhibitor I {ECO:0000303|PubMed:14515156, ECO:0000303|PubMed:16635550};
OS Cyclanthera pedata (Achocha) (Caihua).
OC Eukaryota; Viridiplantae; Streptophyta; Embryophyta; Tracheophyta;
OC Spermatophyta; Magnoliopsida; eudicotyledons; Gunneridae; Pentapetalae;
OC rosids; fabids; Cucurbitales; Cucurbitaceae; Sicyoeae; Cyclanthera.
OX NCBI_TaxID=198836;
RN [1] {ECO:0000305}
RP PROTEIN SEQUENCE, AND REACTIVE SITE.
RC TISSUE=Seed {ECO:0000269|PubMed:14515156};
RX PubMed=14515156;
RA Polanowski A., Wilimowska-Pelc A., Kowalska J., Grybel J., Zelazko M.,
RA Wilusz T.;
RT "Non-conventional affinity chromatography of serine proteinases and their
RT inhibitors.";
RL Acta Biochim. Pol. 50:765-773(2003).
RN [2] {ECO:0000305}
RP PROTEIN SEQUENCE, FUNCTION, AND REACTIVE SITE.
RC TISSUE=Seed {ECO:0000269|PubMed:16635550};
RX PubMed=16635550; DOI=10.1016/j.bbagen.2006.03.011;
RA Kowalska J., Zablocka A., Wilusz T.;
RT "Isolation and primary structures of seven serine proteinase inhibitors
RT from Cyclanthera pedata seeds.";
RL Biochim. Biophys. Acta 1760:1054-1063(2006).
CC -!- FUNCTION: Strongly inhibits trypsin, weakly inhibits chymotrypsin.
CC {ECO:0000269|PubMed:16635550}.
CC -!- SUBCELLULAR LOCATION: Secreted {ECO:0000305}.
CC -!- DOMAIN: The presence of a 'disulfide through disulfide knot'
CC structurally defines this protein as a knottin.
CC {ECO:0000250|UniProtKB:P01074}.
CC -!- SIMILARITY: Belongs to the protease inhibitor I7 (squash-type serine
CC protease inhibitor) family. {ECO:0000255}.
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DR AlphaFoldDB; P83394; -.
DR SMR; P83394; -.
DR GO; GO:0005576; C:extracellular region; IEA:UniProtKB-SubCell.
DR GO; GO:0004867; F:serine-type endopeptidase inhibitor activity; IEA:UniProtKB-KW.
DR CDD; cd00150; PlantTI; 1.
DR InterPro; IPR000737; Prot_inh_squash.
DR InterPro; IPR011052; Proteinase_amylase_inhib_sf.
DR Pfam; PF00299; Squash; 1.
DR PRINTS; PR00293; SQUASHINHBTR.
DR SUPFAM; SSF57027; SSF57027; 1.
DR PROSITE; PS00286; SQUASH_INHIBITOR; 1.
PE 1: Evidence at protein level;
KW Direct protein sequencing; Disulfide bond; Knottin; Protease inhibitor;
KW Secreted; Serine protease inhibitor.
FT PEPTIDE 1..29
FT /note="Trypsin inhibitor 3"
FT /evidence="ECO:0000269|PubMed:14515156,
FT ECO:0000269|PubMed:16635550"
FT /id="PRO_0000033204"
FT PEPTIDE 2..29
FT /note="Trypsin inhibitor 1"
FT /evidence="ECO:0000269|PubMed:14515156,
FT ECO:0000269|PubMed:16635550"
FT /id="PRO_0000033205"
FT SITE 5..6
FT /note="Reactive bond"
FT /evidence="ECO:0000269|PubMed:14515156,
FT ECO:0000269|PubMed:16635550"
FT DISULFID 3..20
FT /evidence="ECO:0000250|UniProtKB:P01074"
FT DISULFID 10..22
FT /evidence="ECO:0000250|UniProtKB:P01074"
FT DISULFID 16..28
FT /evidence="ECO:0000250|UniProtKB:P01074"
SQ SEQUENCE 29 AA; 3195 MW; D5FEFF8A5FEDCC2F CRC64;
RICPRILMEC KADSDCLAQC ICEESGFCG