ID   LECB1_ARTTO             Reviewed;          20 AA.
AC   Q9S8T1;
DT   07-FEB-2006, integrated into UniProtKB/Swiss-Prot.
DT   01-MAY-2000, sequence version 1.
DT   25-MAY-2022, entry version 28.
DE   RecName: Full=Agglutinin beta-1 chain;
DE   AltName: Full=Agglutinin beta-I chain;
DE   AltName: Full=Jacalin beta-I chain;
DE   Flags: Fragment;
OS   Artocarpus tonkinensis.
OC   Eukaryota; Viridiplantae; Streptophyta; Embryophyta; Tracheophyta;
OC   Spermatophyta; Magnoliopsida; eudicotyledons; Gunneridae; Pentapetalae;
OC   rosids; fabids; Rosales; Moraceae; Artocarpus.
OX   NCBI_TaxID=3492;
RN   [1] {ECO:0000305}
RP   PROTEIN SEQUENCE.
RX   PubMed=8427879; DOI=10.1016/0304-4165(93)90139-y;
RA   Ngoc L.D., Brillard M., Hoebeke J.;
RT   "The alpha- and beta-subunits of the jacalins are cleavage products from a
RT   17-kDa precursor.";
RL   Biochim. Biophys. Acta 1156:219-222(1993).
CC   -!- FUNCTION: D-galactose-specific lectin, binds the T-antigen structure
CC       Gal-beta1,3-GalNAc (Thomsen-Friedenreich-antigen-specific lectin).
CC       Potent and selective stimulant of distinct T- and B-cell functions.
CC       Shows a unique ability to specifically recognize IgA-1 from human serum
CC       (By similarity). {ECO:0000250|UniProtKB:P18671}.
CC   -!- SUBUNIT: Tetramer of four alpha chains associated with two or four beta
CC       chains. {ECO:0000250|UniProtKB:P18671}.
CC   -!- SIMILARITY: Belongs to the jacalin lectin family. {ECO:0000255}.
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DR   PIR; S29635; S29635.
DR   AlphaFoldDB; Q9S8T1; -.
DR   GO; GO:0030246; F:carbohydrate binding; ISS:UniProtKB.
DR   GO; GO:0019862; F:IgA binding; ISS:UniProtKB.
PE   1: Evidence at protein level;
KW   Direct protein sequencing; IgA-binding protein; Lectin.
FT   CHAIN           1..>20
FT                   /note="Agglutinin beta-1 chain"
FT                   /id="PRO_0000072801"
FT   REGION          1..20
FT                   /note="Disordered"
FT                   /evidence="ECO:0000256|SAM:MobiDB-lite"
FT   NON_TER         20
FT                   /evidence="ECO:0000303|PubMed:8427879"
SQ   SEQUENCE   20 AA;  2131 MW;  894893667060EFFE CRC64;
     KQRSGESQNI IVGSWGAKVS