ID A0A0H3MDH6_ECO7I Unreviewed; 1024 AA.
AC A0A0H3MDH6;
DT 16-SEP-2015, integrated into UniProtKB/TrEMBL.
DT 16-SEP-2015, sequence version 1.
DT 27-MAR-2024, entry version 42.
DE RecName: Full=Beta-galactosidase {ECO:0000256|ARBA:ARBA00012756, ECO:0000256|HAMAP-Rule:MF_01687};
DE Short=Beta-gal {ECO:0000256|HAMAP-Rule:MF_01687};
DE EC=3.2.1.23 {ECO:0000256|ARBA:ARBA00012756, ECO:0000256|HAMAP-Rule:MF_01687};
DE AltName: Full=Lactase {ECO:0000256|ARBA:ARBA00032230, ECO:0000256|HAMAP-Rule:MF_01687};
GN Name=lacZ {ECO:0000256|HAMAP-Rule:MF_01687,
GN ECO:0000313|EMBL:CAR16474.1};
GN OrderedLocusNames=ECIAI39_0334 {ECO:0000313|EMBL:CAR16474.1};
OS Escherichia coli O7:K1 (strain IAI39 / ExPEC).
OC Bacteria; Pseudomonadota; Gammaproteobacteria; Enterobacterales;
OC Enterobacteriaceae; Escherichia.
OX NCBI_TaxID=585057 {ECO:0000313|EMBL:CAR16474.1, ECO:0000313|Proteomes:UP000000749};
RN [1] {ECO:0000313|Proteomes:UP000000749}
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=IAI39 / ExPEC {ECO:0000313|Proteomes:UP000000749};
RX PubMed=19165319; DOI=10.1371/journal.pgen.1000344;
RA Touchon M., Hoede C., Tenaillon O., Barbe V., Baeriswyl S., Bidet P.,
RA Bingen E., Bonacorsi S., Bouchier C., Bouvet O., Calteau A., Chiapello H.,
RA Clermont O., Cruveiller S., Danchin A., Diard M., Dossat C., Karoui M.E.,
RA Frapy E., Garry L., Ghigo J.M., Gilles A.M., Johnson J., Le Bouguenec C.,
RA Lescat M., Mangenot S., Martinez-Jehanne V., Matic I., Nassif X., Oztas S.,
RA Petit M.A., Pichon C., Rouy Z., Ruf C.S., Schneider D., Tourret J.,
RA Vacherie B., Vallenet D., Medigue C., Rocha E.P.C., Denamur E.;
RT "Organised genome dynamics in the Escherichia coli species results in
RT highly diverse adaptive paths.";
RL PLoS Genet. 5:E1000344-E1000344(2009).
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 Evidence={ECO:0000256|ARBA:ARBA00001412, ECO:0000256|HAMAP-
CC Rule:MF_01687};
CC -!- COFACTOR:
CC Name=Mg(2+); Xref=ChEBI:CHEBI:18420;
CC Evidence={ECO:0000256|HAMAP-Rule:MF_01687};
CC Note=Binds 2 magnesium ions per monomer. {ECO:0000256|HAMAP-
CC Rule:MF_01687};
CC -!- COFACTOR:
CC Name=Na(+); Xref=ChEBI:CHEBI:29101;
CC Evidence={ECO:0000256|HAMAP-Rule:MF_01687};
CC Note=Binds 1 sodium ion per monomer. {ECO:0000256|HAMAP-Rule:MF_01687};
CC -!- SUBUNIT: Homotetramer. {ECO:0000256|HAMAP-Rule:MF_01687}.
CC -!- SIMILARITY: Belongs to the glycosyl hydrolase 2 family.
CC {ECO:0000256|ARBA:ARBA00007401, ECO:0000256|HAMAP-Rule:MF_01687}.
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DR EMBL; CU928164; CAR16474.1; -; Genomic_DNA.
DR RefSeq; WP_000177898.1; NC_011750.1.
DR RefSeq; YP_002406376.1; NC_011750.1.
DR AlphaFoldDB; A0A0H3MDH6; -.
DR STRING; 585057.ECIAI39_0334; -.
DR KEGG; ect:ECIAI39_0334; -.
DR PATRIC; fig|585057.6.peg.361; -.
DR HOGENOM; CLU_002346_0_2_6; -.
DR Proteomes; UP000000749; Chromosome.
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:0000287; F:magnesium ion binding; IEA:UniProtKB-UniRule.
DR GO; GO:0005975; P:carbohydrate metabolic process; IEA:InterPro.
DR GO; GO:1901575; P:organic substance catabolic process; IEA:UniProt.
DR Gene3D; 2.70.98.10; -; 1.
DR Gene3D; 2.60.120.260; Galactose-binding domain-like; 1.
DR Gene3D; 3.20.20.80; Glycosidases; 1.
DR Gene3D; 2.60.40.10; Immunoglobulins; 2.
DR HAMAP; MF_01687; Beta_gal; 1.
DR InterPro; IPR004199; B-gal_small/dom_5.
DR InterPro; IPR036156; Beta-gal/glucu_dom_sf.
DR InterPro; IPR011013; Gal_mutarotase_sf_dom.
DR InterPro; IPR008979; Galactose-bd-like_sf.
DR InterPro; IPR014718; GH-type_carb-bd.
DR InterPro; IPR006101; Glyco_hydro_2.
DR InterPro; IPR023232; Glyco_hydro_2_AS.
DR InterPro; IPR023933; Glyco_hydro_2_beta_Galsidase.
DR InterPro; IPR006103; Glyco_hydro_2_cat.
DR InterPro; IPR023230; Glyco_hydro_2_CS.
DR InterPro; IPR006102; Glyco_hydro_2_Ig-like.
DR InterPro; IPR006104; Glyco_hydro_2_N.
DR InterPro; IPR017853; Glycoside_hydrolase_SF.
DR InterPro; IPR013783; Ig-like_fold.
DR InterPro; IPR032312; LacZ_4.
DR PANTHER; PTHR46323; BETA-GALACTOSIDASE; 1.
DR PANTHER; PTHR46323:SF2; BETA-GALACTOSIDASE; 1.
DR Pfam; PF02929; Bgal_small_N; 1.
DR Pfam; PF00703; Glyco_hydro_2; 1.
DR Pfam; PF02836; Glyco_hydro_2_C; 1.
DR Pfam; PF02837; Glyco_hydro_2_N; 1.
DR Pfam; PF16353; LacZ_4; 1.
DR PRINTS; PR00132; GLHYDRLASE2.
DR SMART; SM01038; Bgal_small_N; 1.
DR SUPFAM; SSF51445; (Trans)glycosidases; 1.
DR SUPFAM; SSF49303; beta-Galactosidase/glucuronidase domain; 2.
DR SUPFAM; SSF74650; Galactose mutarotase-like; 1.
DR SUPFAM; SSF49785; Galactose-binding domain-like; 1.
DR PROSITE; PS00719; GLYCOSYL_HYDROL_F2_1; 1.
DR PROSITE; PS00608; GLYCOSYL_HYDROL_F2_2; 1.
PE 3: Inferred from homology;
KW Glycosidase {ECO:0000256|ARBA:ARBA00023295, ECO:0000256|HAMAP-
KW Rule:MF_01687};
KW Hydrolase {ECO:0000256|ARBA:ARBA00022801, ECO:0000256|HAMAP-Rule:MF_01687};
KW Magnesium {ECO:0000256|ARBA:ARBA00022842, ECO:0000256|HAMAP-Rule:MF_01687};
KW Metal-binding {ECO:0000256|ARBA:ARBA00022723, ECO:0000256|HAMAP-
KW Rule:MF_01687};
KW Sodium {ECO:0000256|ARBA:ARBA00023053, ECO:0000256|HAMAP-Rule:MF_01687}.
FT DOMAIN 749..1022
FT /note="Beta galactosidase small chain/"
FT /evidence="ECO:0000259|SMART:SM01038"
FT ACT_SITE 462
FT /note="Proton donor"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_01687"
FT ACT_SITE 538
FT /note="Nucleophile"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_01687"
FT BINDING 103
FT /ligand="substrate"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_01687"
FT BINDING 202
FT /ligand="Na(+)"
FT /ligand_id="ChEBI:CHEBI:29101"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_01687"
FT BINDING 202
FT /ligand="substrate"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_01687"
FT BINDING 417
FT /ligand="Mg(2+)"
FT /ligand_id="ChEBI:CHEBI:18420"
FT /ligand_label="1"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_01687"
FT BINDING 419
FT /ligand="Mg(2+)"
FT /ligand_id="ChEBI:CHEBI:18420"
FT /ligand_label="1"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_01687"
FT BINDING 462
FT /ligand="Mg(2+)"
FT /ligand_id="ChEBI:CHEBI:18420"
FT /ligand_label="1"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_01687"
FT BINDING 462
FT /ligand="substrate"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_01687"
FT BINDING 538..541
FT /ligand="substrate"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_01687"
FT BINDING 598
FT /ligand="Mg(2+)"
FT /ligand_id="ChEBI:CHEBI:18420"
FT /ligand_label="2"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_01687"
FT BINDING 602
FT /ligand="Na(+)"
FT /ligand_id="ChEBI:CHEBI:29101"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_01687"
FT BINDING 605
FT /ligand="Na(+)"
FT /ligand_id="ChEBI:CHEBI:29101"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_01687"
FT BINDING 605
FT /ligand="substrate"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_01687"
FT BINDING 1000
FT /ligand="substrate"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_01687"
FT SITE 358
FT /note="Transition state stabilizer"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_01687"
FT SITE 392
FT /note="Transition state stabilizer"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_01687"
SQ SEQUENCE 1024 AA; 116657 MW; 59C69BA851047364 CRC64;
MTMITDSLAV VLQRRDWENP GVTQLNRLAA HPPFASWRNS EEARTDRPSQ QLRSLNGEWR
FAWFPAPEAV PESWLECDLP EADTVVVPSN WQMHGYDAPI YTNVTYPITV NPPFVPAENP
TGCYSLTFNV DESWLQEGQT RIIFDGVNSA FHLWCNGRWV GYGQDSRLPS EFDLSAFLRA
GKNRLAVMVL RWSDGSYLED QDMWRMSGIF RDVSLLHKPT TQISDFQVTT RFNDDFSRAV
LEANVQMYGE LRDELRVTVS LWQGETQVAS GTAPFGGEII DERGGYVDLV TLRLNVENPE
LWSAEIPNLY RAVVELHTAD GTLIEAEACD VGFREVRIEN GLLLLNGKPL LIRGVNRHEH
HPLHGQVMDE QTMVQDILLM KQNNFNAVRC SHYPNHPLWY TLCDRYGLYV VDEANIETHG
MVPMNRLTDD PRWLPAMSER VTRMVQRDRN HPSVIIWSLG NESGHGANHD ALYRWIKSVD
PSRPVQYEGG GADTSATDII CPMYARVDED QPFPAVPKWS IKKWLSLPGE MRPLILCEYA
HAMGNSLGGF AKYWQAFRQY PRLQGGFVWD WVDQSLIKYD ENGNPWSAYG GDFGDTPNDR
QFCMNGLVFA DRTPHPALTE AKHQQQFFQF RLSGRTIEVT SEYLFRHSDN ELLHWSVALD
GKPLASGEVP LDVAPQDKQV IELPELPQPE STGQLWLTVH VVQPNATAWS EARHISAWQQ
WRLAENLSVT LPSAPHAIPQ LTTSETDFCI ELDNKRWQFN RQSGFLSQMW IGDEKQLLTP
LRDQFTRAPL DNDIGVSEAT RIDPNAWVER WKAAGHYQAE AALLQCTADT LADAVLITTA
HAWQHQGKTL FISRKTYRID GSGQMAITVD VEVASDTPHP ARIGLTCQLA QVAERVNWLG
LGPQENYPDR LTAACFDRWD LPLSDMYTPY VFPSENGLRC GTRELNYGPH QWRGDFQFNI
SRYSQQQLME TSHRHLLHAE EGTWLNIDGF HMGIGGDDSW SPSVSAEFQL SAGRYHYQLV
WCQK
//
