ID   BGAM_LEULA              Reviewed;         319 AA.
AC   Q02604;
DT   01-JUL-1993, integrated into UniProtKB/Swiss-Prot.
DT   01-JUL-1993, sequence version 1.
DT   25-MAY-2022, entry version 66.
DE   RecName: Full=Beta-galactosidase small subunit;
DE            Short=Beta-gal small subunit;
DE            EC=3.2.1.23;
DE   AltName: Full=Lactase small subunit;
GN   Name=lacM;
OS   Leuconostoc lactis.
OG   Plasmid pNZ63.
OC   Bacteria; Firmicutes; Bacilli; Lactobacillales; Lactobacillaceae;
OC   Leuconostoc.
OX   NCBI_TaxID=1246;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [GENOMIC DNA], AND PROTEIN SEQUENCE OF 1-10.
RC   STRAIN=NZ6009;
RX   PubMed=1624440; DOI=10.1128/jb.174.13.4475-4481.1992;
RA   David S., Stevens H., van Riel M., Simons G., de Vos W.M.;
RT   "Leuconostoc lactis beta-galactosidase is encoded by two overlapping
RT   genes.";
RL   J. Bacteriol. 174:4475-4481(1992).
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=Hydrolysis of terminal non-reducing beta-D-galactose residues
CC         in beta-D-galactosides.; EC=3.2.1.23;
CC   -!- SUBUNIT: Heterodimer of a large and a small subunit.
CC   -!- SIMILARITY: Belongs to the bacterial beta-galactosidase small subunit
CC       family. {ECO:0000305}.
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DR   EMBL; M92281; AAA25268.1; -; Genomic_DNA.
DR   PIR; B42891; B42891.
DR   AlphaFoldDB; Q02604; -.
DR   SMR; Q02604; -.
DR   CAZy; GH2; Glycoside Hydrolase Family 2.
DR   GO; GO:0009341; C:beta-galactosidase complex; IEA:InterPro.
DR   GO; GO:0004565; F:beta-galactosidase activity; IEA:UniProtKB-EC.
DR   GO; GO:0030246; F:carbohydrate binding; IEA:InterPro.
DR   GO; GO:0005975; P:carbohydrate metabolic process; IEA:InterPro.
DR   Gene3D; 2.70.98.10; -; 1.
DR   InterPro; IPR004199; B-gal_small/dom_5.
DR   InterPro; IPR011013; Gal_mutarotase_sf_dom.
DR   InterPro; IPR014718; GH-type_carb-bd.
DR   Pfam; PF02929; Bgal_small_N; 1.
DR   SMART; SM01038; Bgal_small_N; 1.
DR   SUPFAM; SSF74650; SSF74650; 1.
PE   1: Evidence at protein level;
KW   Direct protein sequencing; Glycosidase; Hydrolase; Plasmid.
FT   CHAIN           1..319
FT                   /note="Beta-galactosidase small subunit"
FT                   /id="PRO_0000057673"
SQ   SEQUENCE   319 AA;  35260 MW;  880794B75AC0F009 CRC64;
     MAYTNNQLHV IYGDGSLGLQ GANFHYLFSY ERGGLESLVV NDKEWLYRTP TPMFWRATTD
     NDHGSGFSVK SAQWYAADKF STCQDIELTV DDQPVTPLPI APLNNKYTDH EIATKVSLAY
     HFVTTTVPST IVTVTYTVTA DGQINIATHY SGQSDLPELP AFGLRFIMPT TATGFDYTGL
     SGETYPDRLA GATHGQFHVD SLPVTPYLVP QECGMHMQTE QVTVTRSTTQ NNADHDNTPF
     SLTFSQTDAP FAFSCLPYTA AELENATHME ELPLARRTVL SIYGAVRGVG GIDSWGTDVE
     APYHILANQD IDFSFNIHF