Activities in Family	β-galactosidase (EC 3.2.1.23) ; β-mannosidase (EC 3.2.1.25); β-glucuronidase (EC 3.2.1.31); α-L-arabinofuranosidase (EC 3.2.1.55); mannosylglycoprotein endo-β-mannosidase (EC 3.2.1.152); exo-β-glucosaminidase (EC 3.2.1.165)
Mechanism	Retaining
Clan	GH-A
3D Structure Status	( β / α ) 8
Catalytic Nucleophile/Base	Glu (experimental)
Catalytic Proton Donor	Glu (experimental)
External resources	CAZypedia; HOMSTRAD; PRINTS; PROSITE;
Commercial Enzyme Provider(s)	MEGAZYME; PROZOMIX;
Statistics	GenBank accession (10910); Uniprot accession (1662); PDB accession (112); 3D entries (24); cryst (2)

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Bacteria
Protein Name	EC#	Organism	GenBank	Uniprot	PDB/3D
β-galactosidase (LacZ)	3.2.1.23	Actinobacillus pleuropneumoniae CM5	AAB17954.1	P70753
β-galactosidase (partial)	3.2.1.23	Alkalilactibacillus ikkensis 517	ACO52514.1	C1KC07
exo-β-glucosaminidase / exochitosanase (CsxA)	3.2.1.165	Amycolatopsis orientalis	AAX62629.2 AAX62629.1	Q56F26	2VZO[A,B] 2VZS[A,B] 2VZT[A,B] 2VZU[A,B] 2VZV[A,B] 2X05[A,B] 2X09[A,B]
β-galactosidase (BglA)	3.2.1.23	Arthrobacter psychrolactophilus F2	BAF33372.1	Q08KN3
β-galactosidase (LacZ)	3.2.1.23	Arthrobacter sp.	AAA69907.1	Q59140
β-galactosidase (BgaS)	3.2.1.23	Arthrobacter sp. 20B	ACI41243.1	B6EAX7
β-galactosidase (LacZ)	3.2.1.23	Arthrobacter sp. C2-2	CAD29775.1	Q8KRF6	1YQ2[A,B,C,D,E,F]
β-galactosidase (GalA)	3.2.1.23	Arthrobacter sp. ON14	ADJ18283.1	D9IU58
β-glucuronidase (Gus)	3.2.1.31	Arthrobacter sp. RP10	AAV91790.1	Q5MJX7
β-glucuronidase (Gus)	3.2.1.31	Arthrobacter sp. RP40.7	AAV91792.1	Q5MJX5
β-galactosidase (LacZ)	3.2.1.23	Arthrobacter sp. SB	AAQ19029.1	Q7WTU5
β-galactosidase A / B / C / D / 91 (Bga;BgaD;β-Gal-A;β-Gal-B;β-Gal-C;β-Gal-D;β-Glα-91)	3.2.1.23	Bacillus circulans ATCC 31382	BAJ61032.1		4YPJ[A,B]
β-galactosidase	3.2.1.23	Bacillus megaterium 2-37-4-1	ABN13675.1	A3FFK4
β-galactosidase (BgaM)	3.2.1.23	Bacillus megaterium DSM 319	CAA04267.1 ADF38979.1	O52847
β-galactosidase (Lacz_13;BoGH2A;BACOVA_02645;Bovatus_03065)	3.2.1.23	Bacteroides ovatus ATCC 8483	ALJ47673.1
β-mannosidase (BT0458;BT_0458) (Man2A)	3.2.1.25	Bacteroides thetaiotaomicron VPI-5482	AAO75565.1 NP_809371.1	Q8AAK6	2JE8[A,B] 2VJX[A,B] 2VL4[A,B] 2VMF[A,B] 2VO5[A,B] 2VOT[A,B] 2VQT[A,B] 2VQU[A,B] 2VR4[A,B] 2WBK[A,B]
bimodular β-L-arabinofuranosidase / β-glucuronidase (BT0996;BT_0996)	3.2.1.31 3.2.1.185	Bacteroides thetaiotaomicron VPI-5482	AAO76103.1 NP_809909.1	Q8A921
β-galactosidase (BIF1;OLGA1)	3.2.1.23	Bifidobacterium bifidum DSM 20215	CAB75342.1
β-galactosidase (BIF3)	3.2.1.23	Bifidobacterium bifidum DSM 20215	CAC14566.2 AAP64961.1 ABI07182.1 CAD19366.1	Q9F4D5
β-galactosidase (BIF2)	3.2.1.23	Bifidobacterium bifidum DSM 20215	CAC14565.1	Q9F4D6
lacto-N-neotetraose β-galactosidase (BbgIII)	3.2.1.23	Bifidobacterium bifidum JCM 1254	BAI94821.1		5DMY[A,B,C]
β-galactosidase P1 (BbgI;Bbg1)	3.2.1.23	Bifidobacterium bifidum NCIMB 41171	ABE27151.1 ABE27151.2	Q0ZI53
β-galactosidase S1 (BbgIII)	3.2.1.23	Bifidobacterium bifidum NCIMB 41171	ABE27152.1	A4K5H9
β-galactosidase K2 (BbgIV)	3.2.1.23	Bifidobacterium bifidum NCIMB 41171	ABE00939.1	Q0ZII7
β-galactosidase (LacZ;Lacz6;Bbr_1552_lacZ;Bbr_1552	3.2.1.23	Bifidobacterium breve UCC2003	ABE96223.1
β-galactosidase (LacZ;BL0978)	3.2.1.23	Bifidobacterium longum NCC2705	AAN24786.1 NP_696150.1	Q8G5N0
β-galactosidase 2A (Blon_2334) (Bga2A)	3.2.1.23	Bifidobacterium longum subsp. infantis ATCC 15697 = JCM 1222 = DSM 20088	ACJ53392.1	B7GNN6
β-galactosidase (Blon_0268)	3.2.1.23	Bifidobacterium longum subsp. infantis ATCC 15697 = JCM 1222 = DSM 20088	ACJ51396.1	B7GTV5
β-galactosidase I (β-GalI)	3.2.1.23	Bifidobacterium longum subsp. infantis HL96	AAL02052.1	Q93GI6
β-galactosidase (LacZ)	3.2.1.23	Bifidobacterium longum subsp. longum MB219	CAB44428.1	Q9X6Y5
galactomannan-binding β-1,4-mannosidase (CbMan2A;Athe_0227) (Man2A)	3.2.1.25	Caldicellulosiruptor bescii DSM 6725	ACM59377.1	B9MME5
β-galactosidase (Lac;OLGA313)	3.2.1.23	Caldicellulosiruptor lactoaceticus	CAC50563.1	Q93KF0
β-mannosidase 2A (CfMan2A) (Man2A)	3.2.1.25	Cellulomonas fimi ATCC 484	AAD42775.1 AEE46894.1	Q9XCV4
β-galactosidase	3.2.1.23	Clostridium acetobutylicum	AAA23216.1	P24131
β-mannosidase (DtMan;DICTH_1692)	3.2.1.25	Dictyoglomus thermophilum H-6-12	ACI19676.1	B5YAN4	5N6U[A,B,C,D]
β-galactosidase (Bga;BgaB5)	3.2.1.23	Enterobacter cloacae B5	ABB73039.1	Q2XQU3
β-galactosidase (LacZ)	3.2.1.23	Enterobacter cloacae GAO	BAA07673.1	Q47077
β-galactosidase (LacZ)	3.2.1.23	Escherichia coli	CAC87491.1	Q8VNN2	4TTG[A,B,C,D]
β-galactosidase (LacZ;EcDH1_3262)	3.2.1.23	Escherichia coli DH1	ACX40886.1 BAJ42187.1	C9QQT4
β-galactosidase Z (LacZ;Lac-Z;b0344;EO53_16565)	3.2.1.23	Escherichia coli str. K-12 substr. MG1655	AAA24053.1 AAB18068.1 AAC73447.1 AAW06767.1 AAY73171.1 ABN72582.1 AEL16982.1 AIZ92504.1 ALI41840.1 AMC97588.1 CAA23573.1 NP_414878.1	B8LFD6 P00722	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
β-glucuronidase (UidA;GusA;GurA;b1617)	3.2.1.31	Escherichia coli str. K-12 substr. MG1655	AAC74689.1 AAA68923.1 AAB30197.1 AAR75623.1 ABE20937.1 ACR88323.1 AIZ91278.1 ALI40610.1 AMC98822.1 CAJ55495.1 CAJ55496.1 CAJ55497.1 CAJ55498.1 CAJ55499.1 CAJ55500.1 NP_416134.1	P05804	3K46[A,B] 3K4A[A,B] 3K4D[A,B] 3LPF[A,B] 3LPG[A,B] 4JHZ[A,B] 5CZK[A,B]
evolved β-galactosidase (EbgA;b3076)	3.2.1.23	Escherichia coli str. K-12 substr. MG1655	AAA61971.1 AAA57877.1 AAC76111.1 AAT48164.1 AIZ89904.1 ALI39224.1 AMC95983.1 CAA36274.1 NP_417547.2	P06864
β-galactosidase (LacZ)	3.2.1.23	Escherichia coli str. K-12 substr. W3110	BAE76126.1
β-galactosidase (Gal4214-1)	3.2.1.23	Flavobacterium sp. 4214	AAX48919.1	Q2VT50
β-galactosidase (BglP)	3.2.1.23	gamma proteobacterium NT2-2	AMK07416.1
β-galactosidase Z (LacZ)	3.2.1.23	Klebsiella pneumoniae	AAA25082.1	P06219
β-galactosidase (LacZ)	3.2.1.23	Klebsiella pneumoniae 285	AEA30145.1
β-galactosidase (GalB)	3.2.1.23	Klebsiella sp. T17-2	AMK07522.1
β-galactosidase large subunit (LacL)	3.2.1.23	Lactobacillus acidophilus ATCC 4356	ACC38286.1	B2LWG2
β-galactosidase (LacL)	3.2.1.23	Lactobacillus acidophilus JCM 1229	BAA20536.1	A0SWS3 O07684
LVIS_2259 + LVIS_2258	3.2.1.23	Lactobacillus brevis ATCC 367	ABJ65308.1
β-glucuronidase (Gus)	3.2.1.31	Lactobacillus brevis RO1	ACU21612.1	D2DMF3
β-galactosidase Z	3.2.1.23	Lactobacillus delbrueckii	AAA25240.1 AAA25244.1 AAY08349.1 ACW22137.1 CAC07488.1
β-galactosidase Z (LacZ;Lbul?gal;Ldb1201)	3.2.1.23	Lactobacillus delbrueckii subsp. bulgaricus ATCC 11842 = JCM 1002	CAI98003.1 AEN14565.1	Q1G9Z4
β-galactosidase (BgaL3)	3.2.1.23	Lactobacillus delbrueckii subsp. bulgaricus L3	ACE06986.1	B3GS90
β-galactosidase (LacLM;LacL+LacM)	3.2.1.23	Lactobacillus fermentum K4	AEJ32720.1
β-glucuronidase (GusA)	3.2.1.31	Lactobacillus gasseri ADH	AAK07836.1 AAS22718.1	Q9AHJ8
β-galactosidase large subunit (LacL;WANG_0293)	3.2.1.23	Lactobacillus kefiranofaciens ZW3	AEG39988.1
β-galactosidase (LacL+LacM)	3.2.1.23	Lactobacillus plantarum ATCC 8014	AAL09167.1	Q938Q6
β-galactosidase (LacL+LacM)	3.2.1.23	Lactobacillus plantarum FUA3112	CAZ66936.1
β-galactosidase (LacL+LacM,lp_3483+lp_3484)	3.2.1.23	Lactobacillus plantarum WCFS1	CAD65569.1 CCC80451.1 NP_786691.1
β-galactosidase (Lreu?gal) (LacL + LacM)	3.2.1.23	Lactobacillus reuteri L103	ABF72116.1
β-galactosidase L+S (LacL+LacS) (heterodimer)	3.2.1.23	Lactobacillus sakei subsp. sakei DSM 20017	CAA57730.1	Q48846
β-galactosidase (LacZ)	3.2.1.23	Lactococcus lactis ATCC 7962	AAD11504.1 AAC63020.1 CAA56341.1	O87523 Q48727
β-galactosidase (LacZ;L0025)	3.2.1.23	Lactococcus lactis subsp. lactis Il1403	AAK06078.1 NP_268137.2	Q48727
β-galactosidase L+M (LacL+LacM)	3.2.1.23	Leuconostoc lactis	AAA25267.1 CAL48858.1	Q02603
β-galactosidase (BgaA;MsBgaA;MS0806)	3.2.1.23	Mannheimia succiniciproducens MBEL55E	AAU37413.1	Q65UE7
β-glycosidase (Bgp2)	3.2.1.-	Microbacterium esteraromaticum GS514	AFC90218.1
β-mannosidase (ManB;MANB) (partial)	3.2.1.25	Paenibacillus polymyxa A-8 / A8	AGX85875.1
β-galactosidase	3.2.1.23	Pantoea agglomerans B1	ABN42680.1	A3FEW8
β-galactosidase (BgaL;(Par?DG)	3.2.1.23	Paracoccus sp. 32d	ACY69080.1	D1LZK0	5EUV[A,B] 5LDR[A,B]
β-galactosidase (LacZ)	3.2.1.23	Pseudoalteromonas haloplanktis TAE 79	CAA10470.1 AAU97746.1	P81650
β-galactosidase (LacZ)	3.2.1.23	Pseudoalteromonas sp. 22b	AAR92204.1	Q6RGS1
α-L-arabinofuranosidase (TtAFase;Theth_0328)	3.2.1.55	Pseudothermotoga thermarum DSM 5069	AEH50423.1
β-galactosidase Z (LacZ)	3.2.1.23	Psychromonas marina	BAA76741.1	Q9WXJ2
β-glucuronidase (UidA)	3.2.1.31	Ruminococcus gnavus E1	AAQ76046.1	Q6W7J7
β-galactosidase	3.2.1.23	Saccharopolyspora rectivirgula	BAA34817.1	Q9ZBD1
β-1,4-galactosidase	3.2.1.23	Serratia sp. D04	AAZ81660.1	Q3YJ54
β-galactosidase Z (LacZ)	3.2.1.23	Sinorhizobium meliloti 102F34	AAA26296.1	Q59750
β-glucuronidase (GusA)	3.2.1.31	Sphingomonas elodea	ACE13470.1
β-glucuronidase (Gus)	3.2.1.31	Staphylococcus sp. RLH1	AAK29422.1 AAR75615.1 AAR75620.1 AAR75621.1 ABP04762.1	Q9AFA2
β-galactosidase (LacH)	3.2.1.23	Staphylococcus xylosus	CAA74937.1	O33815
β-galactosidase (BgaA;SPD0562;SPD_0562)	3.2.1.23	Streptococcus pneumoniae D39	ABJ53768.1	Q04LN6
β-galactosidase (BgaA)	3.2.1.23	Streptococcus pneumoniae KNR7/87	AAF97242.1	Q9KGU0
β-galactosidase (BgaA;spr0565)	3.2.1.23	Streptococcus pneumoniae R6	AAK99369.1 NP_358159.1	Q8DQP4
β-1,4-galactosidase A (BgaA;SP0648;SP_0648)	3.2.1.23	Streptococcus pneumoniae TIGR4	AAK74795.1 ABA35731.1 NP_345155.1	Q9KGU0	4CU6[A] 4CU7[A] 4CU8[A] 4CUC[A]
β-galactosidase Z (LacZ)	3.2.1.23	Streptococcus thermophilus A054	AAA26913.1 AAA63532.1 AAA63533.1	P23989
β-galactosidase (LacZ)	3.2.1.23	Streptococcus thermophilus FUA3194	CAZ66940.1	C6H180
β-galactosidase (STER_1366)	3.2.1.23	Streptococcus thermophilus LMD-9	ABJ66539.1	Q03JT3
exo-β-glucosaminidase (CsxA;SAV1223;SAV_1223)	3.2.1.165	Streptomyces avermitilis MA-4680 = NBRC 14893	BAC68933.1 NP_822398.1	Q82NR8
β-mannosidase (Bma;Man2S27)	3.2.1.25	Streptomyces sp. S27 ACCC 41168	ACN78887.1 ADK91096.1	D2DFB5
β-galactosidase (Lac)	3.2.1.23	Thermoanaerobacter mathranii	CAC50570.1	Q93IM0
β-galactosidase (Lac)	3.2.1.23	Thermoanaerobacter mathranii	CAC50569.1	Q93IM1
β-galactosidase (LacA;Teth39_0611)	3.2.1.23	Thermoanaerobacter pseudethanolicus ATCC 33223	CAA69850.1 ABY94275.1	P77989
β-galactosidase (LacZ;LacA)	3.2.1.23	Thermoanaerobacterium thermosulfurigenes EM1	AAA23249.1 CAA38462.1	P26257 Q53WT4
β-mannosidase (ManB)	3.2.1.25	Thermobifida fusca TM51	CAD33708.1	Q8KLI9
β-mannosidase (ManB;Tfu_0915)	3.2.1.25	Thermobifida fusca YX	AAZ54953.1	Q47RG4
β-galactosidase Z (LacZ;TmLac;TM1193)	3.2.1.23	Thermotoga maritima MSB8	AAD36268.1 AAA50597.1 AGL50124.1 AHD18900.1 AKE28970.1 CAA04513.1 NP_228998.1	G4FEF3 Q56307
β-glucuronidase (Gus;TmGUS;TM1062;Tmari_1066)	3.2.1.31	Thermotoga maritima MSB8	AAD36143.1 AAR75619.1 AAR75627.1 AGL49990.1 AHD19030.1 AKE28838.1 NP_228868.1	Q9X0F2
β-mannosidase (TM1624;ManA) (Man2)	3.2.1.25	Thermotoga maritima MSB8	AAD36691.1 AAM56797.1 AGL50557.1 AHD18479.1 AKE29383.1 CAB56855.1 NP_229424.1	Q9RIK8 Q9X1V9
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