ID   IP21_SOLTU              Reviewed;          51 AA.
AC   P01079;
DT   21-JUL-1986, integrated into UniProtKB/Swiss-Prot.
DT   21-JUL-1986, sequence version 1.
DT   03-AUG-2022, entry version 74.
DE   RecName: Full=Proteinase inhibitor PTI;
OS   Solanum tuberosum (Potato).
OC   Eukaryota; Viridiplantae; Streptophyta; Embryophyta; Tracheophyta;
OC   Spermatophyta; Magnoliopsida; eudicotyledons; Gunneridae; Pentapetalae;
OC   asterids; lamiids; Solanales; Solanaceae; Solanoideae; Solaneae; Solanum.
OX   NCBI_TaxID=4113;
RN   [1]
RP   PROTEIN SEQUENCE.
RX   PubMed=7074039; DOI=10.1021/bi00533a027;
RA   Hass G.M., Hermodson M.A., Ryan C.A., Gentry L.;
RT   "Primary structures of two low molecular weight proteinase inhibitors from
RT   potatoes.";
RL   Biochemistry 21:752-756(1982).
CC   -!- SUBCELLULAR LOCATION: Secreted.
CC   -!- SIMILARITY: Belongs to the protease inhibitor I20 (potato type II
CC       proteinase inhibitor) family. {ECO:0000305}.
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DR   PIR; A01318; XKPOT.
DR   AlphaFoldDB; P01079; -.
DR   SMR; P01079; -.
DR   PRIDE; P01079; -.
DR   Proteomes; UP000011115; Unassembled WGS sequence.
DR   ExpressionAtlas; P01079; baseline and differential.
DR   GO; GO:0005576; C:extracellular region; IEA:UniProtKB-SubCell.
DR   GO; GO:0004867; F:serine-type endopeptidase inhibitor activity; IEA:UniProtKB-KW.
DR   InterPro; IPR003465; Prot_inh_I20.
DR   Pfam; PF02428; Prot_inhib_II; 1.
PE   1: Evidence at protein level;
KW   Direct protein sequencing; Disulfide bond; Protease inhibitor;
KW   Reference proteome; Secreted; Serine protease inhibitor.
FT   CHAIN           1..51
FT                   /note="Proteinase inhibitor PTI"
FT                   /id="PRO_0000217674"
FT   SITE            38..39
FT                   /note="Reactive bond for trypsin"
FT                   /evidence="ECO:0000250"
FT   DISULFID        3..40
FT                   /evidence="ECO:0000250"
FT   DISULFID        6..24
FT                   /evidence="ECO:0000250"
FT   DISULFID        7..36
FT                   /evidence="ECO:0000250"
FT   DISULFID        13..49
FT                   /evidence="ECO:0000250"
SQ   SEQUENCE   51 AA;  5602 MW;  CE49F1BF60CD40F5 CRC64;
     RICTNCCAGY KGCNYYSANG AFICEGESDP KNPNVCPRNC DTNIAYSKCL R