Skip Header

You are using a version of browser that may not display all the features of this website. Please consider upgrading your browser.
Entry version 73 (31 Jul 2019)
Sequence version 1 (03 Mar 2009)
Previous versions | rss
Other tutorials and videosHelp videoFeedback
Protein

Beta-galactosidase

Gene

lacZ

Organism
Escherichia coli (strain K12)
Status
Unreviewed-Annotation score:

Annotation score:3 out of 5

<p>The annotation score provides a heuristic measure of the annotation content of a UniProtKB entry or proteome. This score <strong>cannot</strong> be used as a measure of the accuracy of the annotation as we cannot define the ‘correct annotation’ for any given protein.<p><a href='/help/annotation_score' target='_top'>More...</a></p>
-Protein inferred from homologyi <p>This indicates the type of evidence that supports the existence of the protein. Note that the ‘protein existence’ evidence does not give information on the accuracy or correctness of the sequence(s) displayed.<p><a href='/help/protein_existence' target='_top'>More...</a></p>

<p>This section provides any useful information about the protein, mostly biological knowledge.<p><a href='/help/function_section' target='_top'>More...</a></p>Functioni

<p>This subsection of the <a href="http://www.uniprot.org/help/function_section">Function</a> section describes the catalytic activity of an enzyme, i.e. a chemical reaction that the enzyme catalyzes.<p><a href='/help/catalytic_activity' target='_top'>More...</a></p>Catalytic activityi

  • Hydrolysis of terminal non-reducing beta-D-galactose residues in beta-D-galactosides.UniRule annotationSAAS annotation EC:3.2.1.23

<p>This subsection of the ‘Function’ section provides information relevant to cofactors. A cofactor is any non-protein substance required for a protein to be catalytically active. Some cofactors are inorganic, such as the metal atoms zinc, iron, and copper in various oxidation states. Others, such as most vitamins, are organic.<p><a href='/help/cofactor' target='_top'>More...</a></p>Cofactori

Protein has several cofactor binding sites:

Sites

Feature keyPosition(s)DescriptionActionsGraphical viewLength
<p>This subsection of the <a href="http://www.uniprot.org/help/function_section">Function</a> section describes the interaction between a single amino acid and another chemical entity. Priority is given to the annotation of physiological ligands.<p><a href='/help/binding' target='_top'>More...</a></p>Binding sitei103SubstrateUniRule annotation1
<p>This subsection of the <a href="http://www.uniprot.org/help/function_section">Function</a> section indicates at which position the protein binds a given metal ion. The nature of the metal is indicated in the ‘Description’ field.<p><a href='/help/metal' target='_top'>More...</a></p>Metal bindingi202SodiumUniRule annotation1
Binding sitei202SubstrateUniRule annotation1
<p>This subsection describes interesting single amino acid sites on the sequence that are not defined in any other subsection. This subsection can be displayed in different sections (‘Function’, ‘PTM / Processing’, ‘Pathology and Biotech’) according to its content.<p><a href='/help/site' target='_top'>More...</a></p>Sitei358Transition state stabilizerUniRule annotation1
Sitei392Transition state stabilizerUniRule annotation1
Metal bindingi417Magnesium 1UniRule annotation1
Metal bindingi419Magnesium 1UniRule annotation1
<p>This subsection of the <a href="http://www.uniprot.org/help/function_section">Function</a> section is used for enzymes and indicates the residues directly involved in catalysis.<p><a href='/help/act_site' target='_top'>More...</a></p>Active sitei462Proton donorUniRule annotation1
Metal bindingi462Magnesium 1UniRule annotation1
Binding sitei462SubstrateUniRule annotation1
Active sitei538NucleophileUniRule annotation1
Metal bindingi598Magnesium 2UniRule annotation1
Metal bindingi602Sodium; via carbonyl oxygenUniRule annotation1
Metal bindingi605SodiumUniRule annotation1
Binding sitei605SubstrateUniRule annotation1
Binding sitei1000SubstrateUniRule annotation1

<p>The <a href="http://www.geneontology.org/">Gene Ontology (GO)</a> project provides a set of hierarchical controlled vocabulary split into 3 categories:<p><a href='/help/gene_ontology' target='_top'>More...</a></p>GO - Molecular functioni

GO - Biological processi

<p>UniProtKB Keywords constitute a <a href="http://www.uniprot.org/keywords">controlled vocabulary</a> with a hierarchical structure. Keywords summarise the content of a UniProtKB entry and facilitate the search for proteins of interest.<p><a href='/help/keywords' target='_top'>More...</a></p>Keywordsi

Molecular functionGlycosidaseUniRule annotationSAAS annotation, Hydrolase
LigandMagnesiumUniRule annotation, Metal-bindingUniRule annotation, SodiumUniRule annotation

Protein family/group databases

Carbohydrate-Active enZymes

More...
CAZyi
GH2 Glycoside Hydrolase Family 2

<p>This section provides information about the protein and gene name(s) and synonym(s) and about the organism that is the source of the protein sequence.<p><a href='/help/names_and_taxonomy_section' target='_top'>More...</a></p>Names & Taxonomyi

<p>This subsection of the <a href="http://www.uniprot.org/help/names_and_taxonomy_section">Names and taxonomy</a> section provides an exhaustive list of all names of the protein, from commonly used to obsolete, to allow unambiguous identification of a protein.<p><a href='/help/protein_names' target='_top'>More...</a></p>Protein namesi
Recommended name:
Beta-galactosidaseUniRule annotationSAAS annotation (EC:3.2.1.23UniRule annotationSAAS annotation)
Short name:
Beta-galUniRule annotation
Alternative name(s):
LactaseUniRule annotation
<p>This subsection of the <a href="http://www.uniprot.org/help/names_and_taxonomy_section">Names and taxonomy</a> section indicates the name(s) of the gene(s) that code for the protein sequence(s) described in the entry. Four distinct tokens exist: ‘Name’, ‘Synonyms’, ‘Ordered locus names’ and ‘ORF names’.<p><a href='/help/gene_name' target='_top'>More...</a></p>Gene namesi
Name:lacZUniRule annotation
ORF Names:FAM12_22125Imported, FAM13_21940Imported, FAZ87_06275Imported
<p>This subsection of the <a href="http://www.uniprot.org/help/names_and_taxonomy_section">Names and taxonomy</a> section provides information on the name(s) of the organism that is the source of the protein sequence.<p><a href='/help/organism-name' target='_top'>More...</a></p>OrganismiEscherichia coli (strain K12)Imported
<p>This subsection of the <a href="http://www.uniprot.org/help/names_and_taxonomy_section">Names and taxonomy</a> section shows the unique identifier assigned by the NCBI to the source organism of the protein. This is known as the ‘taxonomic identifier’ or ‘taxid’.<p><a href='/help/taxonomic_identifier' target='_top'>More...</a></p>Taxonomic identifieri83333 [NCBI]
<p>This subsection of the <a href="http://www.uniprot.org/help/names_and_taxonomy_section">Names and taxonomy</a> section contains the taxonomic hierarchical classification lineage of the source organism. It lists the nodes as they appear top-down in the taxonomic tree, with the more general grouping listed first.<p><a href='/help/taxonomic_lineage' target='_top'>More...</a></p>Taxonomic lineageiBacteriaProteobacteriaGammaproteobacteriaEnterobacteralesEnterobacteriaceaeEscherichia

<p>This section provides information on the location and the topology of the mature protein in the cell.<p><a href='/help/subcellular_location_section' target='_top'>More...</a></p>Subcellular locationi

GO - Cellular componenti

<p>This section describes post-translational modifications (PTMs) and/or processing events.<p><a href='/help/ptm_processing_section' target='_top'>More...</a></p>PTM / Processingi

Proteomic databases

PRoteomics IDEntifications database

More...
PRIDEi
B8LFD6

<p>This section provides information on the quaternary structure of a protein and on interaction(s) with other proteins or protein complexes.<p><a href='/help/interaction_section' target='_top'>More...</a></p>Interactioni

<p>This subsection of the <a href="http://www.uniprot.org/help/interaction_section">'Interaction'</a> section provides information about the protein quaternary structure and interaction(s) with other proteins or protein complexes (with the exception of physiological receptor-ligand interactions which are annotated in the <a href="http://www.uniprot.org/help/function_section">'Function'</a> section).<p><a href='/help/subunit_structure' target='_top'>More...</a></p>Subunit structurei

Homotetramer.

UniRule annotation

<p>This section provides information on the tertiary and secondary structure of a protein.<p><a href='/help/structure_section' target='_top'>More...</a></p>Structurei

3D structure databases

SWISS-MODEL Repository - a database of annotated 3D protein structure models

More...
SMRi
B8LFD6

Database of comparative protein structure models

More...
ModBasei
Search...

<p>This section provides information on sequence similarities with other proteins and the domain(s) present in a protein.<p><a href='/help/family_and_domains_section' target='_top'>More...</a></p>Family & Domainsi

Domains and Repeats

Feature keyPosition(s)DescriptionActionsGraphical viewLength
<p>This subsection of the <a href="http://www.uniprot.org/help/family_and_domains_section">Family and Domains</a> section describes the position and type of a domain, which is defined as a specific combination of secondary structures organized into a characteristic three-dimensional structure or fold.<p><a href='/help/domain' target='_top'>More...</a></p>Domaini749 – 1022Bgal_small_NInterPro annotationAdd BLAST274

Region

Feature keyPosition(s)DescriptionActionsGraphical viewLength
<p>This subsection of the ‘Family and Domains’ section describes a region of interest that cannot be described in other subsections.<p><a href='/help/region' target='_top'>More...</a></p>Regioni538 – 541Substrate bindingUniRule annotation4

<p>This subsection of the ‘Family and domains’ section provides information about the sequence similarity with other proteins.<p><a href='/help/sequence_similarities' target='_top'>More...</a></p>Sequence similaritiesi

Belongs to the glycosyl hydrolase 2 family.UniRule annotationSAAS annotation

Phylogenomic databases

evolutionary genealogy of genes: Non-supervised Orthologous Groups

More...
eggNOGi
ENOG4105CNT Bacteria
COG3250 LUCA

Database for complete collections of gene phylogenies

More...
PhylomeDBi
B8LFD6

Family and domain databases

Gene3D Structural and Functional Annotation of Protein Families

More...
Gene3Di
2.60.120.260, 1 hit
2.60.40.10, 2 hits
2.70.98.10, 1 hit

HAMAP database of protein families

More...
HAMAPi
MF_01687 Beta_gal, 1 hit

Integrated resource of protein families, domains and functional sites

More...
InterProi
View protein in InterPro
IPR004199 B-gal_small/dom_5
IPR036156 Beta-gal/glucu_dom_sf
IPR011013 Gal_mutarotase_sf_dom
IPR008979 Galactose-bd-like_sf
IPR014718 GH-type_carb-bd
IPR006101 Glyco_hydro_2
IPR023232 Glyco_hydro_2_AS
IPR023933 Glyco_hydro_2_beta_Galsidase
IPR006103 Glyco_hydro_2_cat
IPR023230 Glyco_hydro_2_CS
IPR006102 Glyco_hydro_2_Ig-like
IPR006104 Glyco_hydro_2_N
IPR017853 Glycoside_hydrolase_SF
IPR013783 Ig-like_fold
IPR032312 LacZ_4

The PANTHER Classification System

More...
PANTHERi
PTHR46323 PTHR46323, 1 hit

Pfam protein domain database

More...
Pfami
View protein in Pfam
PF02929 Bgal_small_N, 1 hit
PF16353 DUF4981, 1 hit
PF00703 Glyco_hydro_2, 1 hit
PF02836 Glyco_hydro_2_C, 1 hit
PF02837 Glyco_hydro_2_N, 1 hit

Protein Motif fingerprint database; a protein domain database

More...
PRINTSi
PR00132 GLHYDRLASE2

Simple Modular Architecture Research Tool; a protein domain database

More...
SMARTi
View protein in SMART
SM01038 Bgal_small_N, 1 hit

Superfamily database of structural and functional annotation

More...
SUPFAMi
SSF49303 SSF49303, 2 hits
SSF49785 SSF49785, 1 hit
SSF51445 SSF51445, 1 hit
SSF74650 SSF74650, 1 hit

PROSITE; a protein domain and family database

More...
PROSITEi
View protein in PROSITE
PS00719 GLYCOSYL_HYDROL_F2_1, 1 hit
PS00608 GLYCOSYL_HYDROL_F2_2, 1 hit

<p>This section displays by default the canonical protein sequence and upon request all isoforms described in the entry. It also includes information pertinent to the sequence(s), including <a href="http://www.uniprot.org/help/sequence_length">length</a> and <a href="http://www.uniprot.org/help/sequences">molecular weight</a>. The information is filed in different subsections. The current subsections and their content are listed below:<p><a href='/help/sequences_section' target='_top'>More...</a></p>Sequencei

<p>This subsection of the <a href="http://www.uniprot.org/help/sequences_section">Sequence</a> section indicates if the <a href="http://www.uniprot.org/help/canonical_and_isoforms">canonical sequence</a> displayed by default in the entry is complete or not.<p><a href='/help/sequence_status' target='_top'>More...</a></p>Sequence statusi: Complete.

B8LFD6-1 [UniParc]FASTAAdd to basket
« Hide
        10         20         30         40         50
MTMITDSLAV VLQRRDWENP GVTQLNRLAA HPPFASWRNS EEARTDRPSQ
60 70 80 90 100
QLRSLNGEWR FAWFPAPEAV PESWLECDLP EADTVVVPSN WQMHGYDAPI
110 120 130 140 150
YTNVTYPITV NPPFVPTENP TGCYSLTFNV DESWLQEGQT RIIFDGVNSA
160 170 180 190 200
FHLWCNGRWV GYGQDSRLPS EFDLSAFLRA GENRLAVMVL RWSDGSYLED
210 220 230 240 250
QDMWRMSGIF RDVSLLHKPT TQISDFHVAT RFNDDFSRAV LEAEVQMCGE
260 270 280 290 300
LRDYLRVTVS LWQGETQVAS GTAPFGGEII DERGGYADRV TLRLNVENPK
310 320 330 340 350
LWSAEIPNLY RAVVELHTAD GTLIEAEACD VGFREVRIEN GLLLLNGKPL
360 370 380 390 400
LIRGVNRHEH HPLHGQVMDE QTMVQDILLM KQNNFNAVRC SHYPNHPLWY
410 420 430 440 450
TLCDRYGLYV VDEANIETHG MVPMNRLTDD PRWLPAMSER VTRMVQRDRN
460 470 480 490 500
HPSVIIWSLG NESGHGANHD ALYRWIKSVD PSRPVQYEGG GADTTATDII
510 520 530 540 550
CPMYARVDED QPFPAVPKWS IKKWLSLPGE TRPLILCEYA HAMGNSLGGF
560 570 580 590 600
AKYWQAFRQY PRLQGGFVWD WVDQSLIKYD ENGNPWSAYG GDFGDTPNDR
610 620 630 640 650
QFCMNGLVFA DRTPHPALTE AKHQQQFFQF RLSGQTIEVT SEYLFRHSDN
660 670 680 690 700
ELLHWMVALD GKPLASGEVP LDVAPQGKQL IELPELPQPE SAGQLWLTVR
710 720 730 740 750
VVQPNATAWS EAGHISAWQQ WRLAENLSVT LPAASHAIPH LTTSEMDFCI
760 770 780 790 800
ELGNKRWQFN RQSGFLSQMW IGDKKQLLTP LRDQFTRAPL DNDIGVSEAT
810 820 830 840 850
RIDPNAWVER WKAAGHYQAE AALLQCTADT LADAVLITTA HAWQHQGKTL
860 870 880 890 900
FISRKTYRID GSGQMAITVD VEVASDTPHP ARIGLNCQLA QVAERVNWLG
910 920 930 940 950
LGPQENYPDR LTAACFDRWD LPLSDMYTPY VFPSENGLRC GTRELNYGPH
960 970 980 990 1000
QWRGDFQFNI SRYSQQQLME TSHRHLLHAE EGTWLNIDGF HMGIGGDDSW
1010 1020
SPSVSAEFQL SAGRYHYQLV WCQK
Length:1,024
Mass (Da):116,483
Last modified:March 3, 2009 - v1
<p>The checksum is a form of redundancy check that is calculated from the sequence. It is useful for tracking sequence updates.</p> <p>It should be noted that while, in theory, two different sequences could have the same checksum value, the likelihood that this would happen is extremely low.</p> <p>However UniProtKB may contain entries with identical sequences in case of multiple genes (paralogs).</p> <p>The checksum is computed as the sequence 64-bit Cyclic Redundancy Check value (CRC64) using the generator polynomial: x<sup>64</sup> + x<sup>4</sup> + x<sup>3</sup> + x + 1. The algorithm is described in the ISO 3309 standard. </p> <p class="publication">Press W.H., Flannery B.P., Teukolsky S.A. and Vetterling W.T.<br /> <strong>Cyclic redundancy and other checksums</strong><br /> <a href="http://www.nrbook.com/b/bookcpdf.php">Numerical recipes in C 2nd ed., pp896-902, Cambridge University Press (1993)</a>)</p> Checksum:i9D295EF4CEF90B08
GO

Sequence databases

Select the link destinations:

EMBL nucleotide sequence database

More...
EMBLi

GenBank nucleotide sequence database

More...
GenBanki

DNA Data Bank of Japan; a nucleotide sequence database

More...
DDBJi
Links Updated
EF136884 Genomic DNA Translation: ABN72582.1
SSUW01000008 Genomic DNA Translation: THJ01412.1
SSZK01000061 Genomic DNA Translation: THL99592.1
SSZJ01000059 Genomic DNA Translation: THM17059.1

NCBI Reference Sequences

More...
RefSeqi
WP_000177906.1, NZ_SSZK01000061.1

Genome annotation databases

Pathosystems Resource Integration Center (PATRIC)

More...
PATRICi
fig|83333.106.peg.1099

<p>This section provides links to proteins that are similar to the protein sequence(s) described in this entry at different levels of sequence identity thresholds (100%, 90% and 50%) based on their membership in UniProt Reference Clusters (<a href="http://www.uniprot.org/help/uniref">UniRef</a>).<p><a href='/help/similar_proteins_section' target='_top'>More...</a></p>Similar proteinsi

<p>This section is used to point to information related to entries and found in data collections other than UniProtKB.<p><a href='/help/cross_references_section' target='_top'>More...</a></p>Cross-referencesi

Sequence databases

Select the link destinations:
EMBLi
GenBanki
DDBJi
Links Updated
EF136884 Genomic DNA Translation: ABN72582.1
SSUW01000008 Genomic DNA Translation: THJ01412.1
SSZK01000061 Genomic DNA Translation: THL99592.1
SSZJ01000059 Genomic DNA Translation: THM17059.1
RefSeqiWP_000177906.1, NZ_SSZK01000061.1

3D structure databases

SMRiB8LFD6
ModBaseiSearch...

Protein family/group databases

CAZyiGH2 Glycoside Hydrolase Family 2

Proteomic databases

PRIDEiB8LFD6

Protocols and materials databases

Structural Biology KnowledgebaseSearch...

Genome annotation databases

PATRICifig|83333.106.peg.1099

Phylogenomic databases

eggNOGiENOG4105CNT Bacteria
COG3250 LUCA
PhylomeDBiB8LFD6

Family and domain databases

Gene3Di2.60.120.260, 1 hit
2.60.40.10, 2 hits
2.70.98.10, 1 hit
HAMAPiMF_01687 Beta_gal, 1 hit
InterProiView protein in InterPro
IPR004199 B-gal_small/dom_5
IPR036156 Beta-gal/glucu_dom_sf
IPR011013 Gal_mutarotase_sf_dom
IPR008979 Galactose-bd-like_sf
IPR014718 GH-type_carb-bd
IPR006101 Glyco_hydro_2
IPR023232 Glyco_hydro_2_AS
IPR023933 Glyco_hydro_2_beta_Galsidase
IPR006103 Glyco_hydro_2_cat
IPR023230 Glyco_hydro_2_CS
IPR006102 Glyco_hydro_2_Ig-like
IPR006104 Glyco_hydro_2_N
IPR017853 Glycoside_hydrolase_SF
IPR013783 Ig-like_fold
IPR032312 LacZ_4
PANTHERiPTHR46323 PTHR46323, 1 hit
PfamiView protein in Pfam
PF02929 Bgal_small_N, 1 hit
PF16353 DUF4981, 1 hit
PF00703 Glyco_hydro_2, 1 hit
PF02836 Glyco_hydro_2_C, 1 hit
PF02837 Glyco_hydro_2_N, 1 hit
PRINTSiPR00132 GLHYDRLASE2
SMARTiView protein in SMART
SM01038 Bgal_small_N, 1 hit
SUPFAMiSSF49303 SSF49303, 2 hits
SSF49785 SSF49785, 1 hit
SSF51445 SSF51445, 1 hit
SSF74650 SSF74650, 1 hit
PROSITEiView protein in PROSITE
PS00719 GLYCOSYL_HYDROL_F2_1, 1 hit
PS00608 GLYCOSYL_HYDROL_F2_2, 1 hit

ProtoNet; Automatic hierarchical classification of proteins

More...
ProtoNeti
Search...

MobiDB: a database of protein disorder and mobility annotations

More...
MobiDBi
Search...

<p>This section provides general information on the entry.<p><a href='/help/entry_information_section' target='_top'>More...</a></p>Entry informationi

<p>This subsection of the ‘Entry information’ section provides a mnemonic identifier for a UniProtKB entry, but it is not a stable identifier. Each reviewed entry is assigned a unique entry name upon integration into UniProtKB/Swiss-Prot.<p><a href='/help/entry_name' target='_top'>More...</a></p>Entry nameiB8LFD6_ECOLI
<p>This subsection of the ‘Entry information’ section provides one or more accession number(s). These are stable identifiers and should be used to cite UniProtKB entries. Upon integration into UniProtKB, each entry is assigned a unique accession number, which is called ‘Primary (citable) accession number’.<p><a href='/help/accession_numbers' target='_top'>More...</a></p>AccessioniPrimary (citable) accession number: B8LFD6
<p>This subsection of the ‘Entry information’ section shows the date of integration of the entry into UniProtKB, the date of the last sequence update and the date of the last annotation modification (‘Last modified’). The version number for both the entry and the <a href="http://www.uniprot.org/help/canonical_and_isoforms">canonical sequence</a> are also displayed.<p><a href='/help/entry_history' target='_top'>More...</a></p>Entry historyiIntegrated into UniProtKB/TrEMBL: March 3, 2009
Last sequence update: March 3, 2009
Last modified: July 31, 2019
This is version 73 of the entry and version 1 of the sequence. See complete history.
<p>This subsection of the ‘Entry information’ section indicates whether the entry has been manually annotated and reviewed by UniProtKB curators or not, in other words, if the entry belongs to the Swiss-Prot section of UniProtKB (<strong>reviewed</strong>) or to the computer-annotated TrEMBL section (<strong>unreviewed</strong>).<p><a href='/help/entry_status' target='_top'>More...</a></p>Entry statusiUnreviewed (UniProtKB/TrEMBL)
UniProt is an ELIXIR core data resource
Main funding by: National Institutes of Health

We'd like to inform you that we have updated our Privacy Notice to comply with Europe’s new General Data Protection Regulation (GDPR) that applies since 25 May 2018.

Do not show this banner again