ID   SBTXA_SOYBN             Reviewed;          25 AA.
AC   P86520;
DT   13-JUL-2010, integrated into UniProtKB/Swiss-Prot.
DT   13-JUL-2010, sequence version 1.
DT   03-AUG-2022, entry version 20.
DE   RecName: Full=Soybean toxin 27 kDa chain {ECO:0000303|PubMed:18328522};
DE            Short=SBTX 27 kDa chain {ECO:0000303|PubMed:18328522};
DE   Flags: Fragment;
OS   Glycine max (Soybean) (Glycine hispida).
OC   Eukaryota; Viridiplantae; Streptophyta; Embryophyta; Tracheophyta;
OC   Spermatophyta; Magnoliopsida; eudicotyledons; Gunneridae; Pentapetalae;
OC   rosids; fabids; Fabales; Fabaceae; Papilionoideae; 50 kb inversion clade;
OC   NPAAA clade; indigoferoid/millettioid clade; Phaseoleae; Glycine;
OC   Glycine subgen. Soja.
OX   NCBI_TaxID=3847;
RN   [1] {ECO:0000305}
RP   PROTEIN SEQUENCE, FUNCTION, BIOPHYSICOCHEMICAL PROPERTIES, SUBUNIT,
RP   GLYCOSYLATION, AND TOXIC DOSE.
RC   STRAIN=cv. BR-10 {ECO:0000269|PubMed:18328522};
RC   TISSUE=Seed {ECO:0000269|PubMed:18328522};
RX   PubMed=18328522; DOI=10.1016/j.toxicon.2007.10.005;
RA   Vasconcelos I.M., Morais J.K., Siebra E.A., Carlini C.R., Sousa D.O.,
RA   Beltramini L.M., Melo V.M., Oliveira J.T.;
RT   "SBTX, a new toxic protein distinct from soyatoxin and other toxic soybean
RT   [Glycine max] proteins, and its inhibitory effect on Cercospora sojina
RT   growth.";
RL   Toxicon 51:952-963(2008).
RN   [2] {ECO:0000305}
RP   TISSUE SPECIFICITY, AND INDUCTION.
RA   Oliveira H.D.;
RL   Submitted (MAR-2010) to UniProtKB.
RN   [3]
RP   PARTIAL PROTEIN SEQUENCE, FUNCTION, AND TOXIC DOSE.
RC   TISSUE=Seed {ECO:0000303|PubMed:20831249};
RX   PubMed=20831249; DOI=10.1021/jf101688k;
RA   Morais J.K., Gomes V.M., Oliveira J.T., Santos I.S., Da Cunha M.,
RA   Oliveira H.D., Oliveira H.P., Sousa D.O., Vasconcelos I.M.;
RT   "Soybean toxin (SBTX), a protein from soybeans that inhibits the life cycle
RT   of plant and human pathogenic fungi.";
RL   J. Agric. Food Chem. 58:10356-10363(2010).
RN   [4]
RP   FUNCTION.
RX   PubMed=23894655; DOI=10.1371/journal.pone.0070425;
RA   Morais J.K., Bader O., Weig M., Oliveira J.T., Arantes M.R., Gomes V.M.,
RA   Da Cunha M., Oliveira H.D., Sousa D.O., Lourencao A.L., Vasconcelos I.M.;
RT   "Soybean toxin (SBTX) impairs fungal growth by interfering with molecular
RT   transport, carbohydrate/amino acid metabolism and drug/stress responses.";
RL   PLoS ONE 8:E70425-E70425(2013).
CC   -!- FUNCTION: Involved in plant defense (PubMed:18328522). Inhibits spore
CC       germination in C.sojina, A.niger (at concentrations >50 ug/ml) and
CC       P.herguei but not in F.oxysporum and F.solani (PubMed:20831249,
CC       PubMed:18328522). Does not inhibit vegetative mycelial growth
CC       (PubMed:20831249). Inhibits growth of C.albicans and K.marxiannus but
CC       not P.membranifaciens or C.parapsilosis (PubMed:20831249,
CC       PubMed:23894655). Probably acts by affecting the cell membrane
CC       (PubMed:20831249). Does not have urease, chitinase, beta-1,3-glucanase
CC       or hemagglutination activities (PubMed:18328522, PubMed:20831249). Does
CC       not inhibit trypsin (PubMed:18328522). Injection into mice produces
CC       toxic effects such as dyspnea, tonic-clonic convulsion and death
CC       (PubMed:18328522). {ECO:0000269|PubMed:18328522,
CC       ECO:0000269|PubMed:20831249, ECO:0000269|PubMed:23894655}.
CC   -!- BIOPHYSICOCHEMICAL PROPERTIES:
CC       pH dependence:
CC         Activity decreases below pH 5.5 and above pH 8.0.
CC         {ECO:0000269|PubMed:18328522};
CC   -!- SUBUNIT: Heterodimer of a 27 kDa subunit and a 17 kDa subunit;
CC       disulfide-linked. {ECO:0000269|PubMed:18328522}.
CC   -!- TISSUE SPECIFICITY: Expressed in seeds, leaves, roots and stem (at
CC       protein level). {ECO:0000269|Ref.2}.
CC   -!- INDUCTION: In seeds, induced by jasmonate. {ECO:0000269|Ref.2}.
CC   -!- PTM: SBTX is known to be glycosylated but it is not known which one of
CC       its two subunits is modified; contains 5% carbohydrates.
CC       {ECO:0000269|PubMed:18328522}.
CC   -!- TOXIC DOSE: LD(50) is 5.6 mg/kg by intraperitoneal injection into mice.
CC       {ECO:0000269|PubMed:18328522, ECO:0000269|PubMed:20831249}.
CC   -!- MISCELLANEOUS: On the 2D-gel the determined pI of SBTX is: 8.2, its MW
CC       is: 44 kDa. {ECO:0000269|PubMed:18328522}.
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DR   AlphaFoldDB; P86520; -.
DR   PRIDE; P86520; -.
DR   Proteomes; UP000008827; Unplaced.
DR   GO; GO:0090729; F:toxin activity; IEA:UniProtKB-KW.
DR   GO; GO:0050832; P:defense response to fungus; IEA:UniProtKB-KW.
DR   GO; GO:0031640; P:killing of cells of another organism; IEA:UniProtKB-KW.
PE   1: Evidence at protein level;
KW   Antimicrobial; Direct protein sequencing; Disulfide bond; Fungicide;
KW   Plant defense; Reference proteome; Toxin.
FT   CHAIN           1..>25
FT                   /note="Soybean toxin 27 kDa chain"
FT                   /id="PRO_0000395397"
FT   NON_TER         25
FT                   /evidence="ECO:0000303|PubMed:18328522"
SQ   SEQUENCE   25 AA;  2728 MW;  CA4A2595EF2A20C8 CRC64;
     ADPTFGFTPL GLSEKANLQI MKAYD