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 139 (26 Feb 2020)
Sequence version 2 (04 Dec 2007)
Previous versions | rss
Help videoAdd a publicationFeedback
Protein

Cystathionine beta-synthase

Gene

cysB

Organism
Dictyostelium discoideum (Slime mold)
Status
Reviewed-Annotation score:

Annotation score:4 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>
-Experimental evidence at transcript leveli <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%5Fsection">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

<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

pyridoxal 5'-phosphate

<p>This subsection of the <a href="http://www.uniprot.org/help/function%5Fsection">'Function'</a> section describes the metabolic pathway(s) associated with a protein.<p><a href='/help/pathway' target='_top'>More...</a></p>Pathwayi: L-cysteine biosynthesis

This protein is involved in step 1 of the subpathway that synthesizes L-cysteine from L-homocysteine and L-serine.
Proteins known to be involved in the 2 steps of the subpathway in this organism are:
  1. Cystathionine beta-synthase (cysB)
  2. Cystathionine gamma-lyase (cysA)
This subpathway is part of the pathway L-cysteine biosynthesis, which is itself part of Amino-acid biosynthesis.
View all proteins of this organism that are known to be involved in the subpathway that synthesizes L-cysteine from L-homocysteine and L-serine, the pathway L-cysteine biosynthesis and in Amino-acid biosynthesis.

Sites

Feature keyPosition(s)DescriptionActionsGraphical viewLength
<p>This subsection of the <a href="http://www.uniprot.org/help/function%5Fsection">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 sitei103Pyridoxal phosphateBy similarity1
Binding sitei302Pyridoxal phosphateBy similarity1

<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 functionLyase
Biological processAmino-acid biosynthesis, Cysteine biosynthesis
LigandPyridoxal phosphate

Enzyme and pathway databases

Reactome - a knowledgebase of biological pathways and processes

More...
Reactomei
R-DDI-1614603 Cysteine formation from homocysteine

UniPathway: a resource for the exploration and annotation of metabolic pathways

More...
UniPathwayi
UPA00136;UER00201

<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%5Fand%5Ftaxonomy%5Fsection">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:
Cystathionine beta-synthase (EC:4.2.1.22)
Alternative name(s):
Beta-thionase
Serine sulfhydrase
<p>This subsection of the <a href="http://www.uniprot.org/help/names%5Fand%5Ftaxonomy%5Fsection">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:cysB
ORF Names:DDB_G0267386
<p>This subsection of the <a href="http://www.uniprot.org/help/names%5Fand%5Ftaxonomy%5Fsection">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>OrganismiDictyostelium discoideum (Slime mold)
<p>This subsection of the <a href="http://www.uniprot.org/help/names%5Fand%5Ftaxonomy%5Fsection">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 identifieri44689 [NCBI]
<p>This subsection of the <a href="http://www.uniprot.org/help/names%5Fand%5Ftaxonomy%5Fsection">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 lineageiEukaryotaAmoebozoaEvoseaEumycetozoaDictyosteliaDictyostelialesDictyosteliaceaeDictyostelium
<p>This subsection of the <a href="http://www.uniprot.org/help/names%5Fand%5Ftaxonomy%5Fsection">Names and taxonomy</a> section is present for entries that are part of a <a href="http://www.uniprot.org/proteomes">proteome</a>, i.e. of a set of proteins thought to be expressed by organisms whose genomes have been completely sequenced.<p><a href='/help/proteomes_manual' target='_top'>More...</a></p>Proteomesi
  • UP000002195 <p>A UniProt <a href="http://www.uniprot.org/manual/proteomes%5Fmanual">proteome</a> can consist of several components.<br></br>The component name refers to the genomic component encoding a set of proteins.<p><a href='/help/proteome_component' target='_top'>More...</a></p> Componentsi: Chromosome 1, Unassembled WGS sequence

Organism-specific databases

Dictyostelium discoideum online informatics resource

More...
dictyBasei
DDB_G0267386 cysB

<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

Molecule processing

Feature keyPosition(s)DescriptionActionsGraphical viewLength
<p>This subsection of the 'PTM / Processing' section describes the extent of a polypeptide chain in the mature protein following processing or proteolytic cleavage.<p><a href='/help/chain' target='_top'>More...</a></p>ChainiPRO_00001671321 – 498Cystathionine beta-synthaseAdd BLAST498

Amino acid modifications

Feature keyPosition(s)DescriptionActionsGraphical viewLength
<p>This subsection of the 'PTM / Processing' section specifies the position and type of each modified residue excluding <a href="http://www.uniprot.org/manual/lipid">lipids</a>, <a href="http://www.uniprot.org/manual/carbohyd">glycans</a> and <a href="http://www.uniprot.org/manual/crosslnk">protein cross-links</a>.<p><a href='/help/mod_res' target='_top'>More...</a></p>Modified residuei73N6-(pyridoxal phosphate)lysineBy similarity1

Proteomic databases

PaxDb, a database of protein abundance averages across all three domains of life

More...
PaxDbi
P46794

PRoteomics IDEntifications database

More...
PRIDEi
P46794

<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

Protein-protein interaction databases

STRING: functional protein association networks

More...
STRINGi
44689.DDB0191292

<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
P46794

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%5Fand%5Fdomains%5Fsection">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>Domaini374 – 430CBS 1PROSITE-ProRule annotationAdd BLAST57
Domaini435 – 497CBS 2PROSITE-ProRule annotationAdd BLAST63

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>Regioni210 – 214Pyridoxal phosphate bindingBy similarity5

<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

Keywords - Domaini

CBS domain, Repeat

Phylogenomic databases

evolutionary genealogy of genes: Non-supervised Orthologous Groups

More...
eggNOGi
KOG1252 Eukaryota
COG0031 LUCA

The HOGENOM Database of Homologous Genes from Fully Sequenced Organisms

More...
HOGENOMi
CLU_021018_0_0_1

InParanoid: Eukaryotic Ortholog Groups

More...
InParanoidi
P46794

KEGG Orthology (KO)

More...
KOi
K01697

Identification of Orthologs from Complete Genome Data

More...
OMAi
MTLVDWT

Database for complete collections of gene phylogenies

More...
PhylomeDBi
P46794

Family and domain databases

Gene3D Structural and Functional Annotation of Protein Families

More...
Gene3Di
3.40.50.1100, 2 hits

Integrated resource of protein families, domains and functional sites

More...
InterProi
View protein in InterPro
IPR000644 CBS_dom
IPR005857 Cysta_beta_synth
IPR001216 P-phosphate_BS
IPR001926 PLP-dep
IPR036052 Trypto_synt_PLP_dependent

Pfam protein domain database

More...
Pfami
View protein in Pfam
PF00571 CBS, 2 hits
PF00291 PALP, 1 hit

Simple Modular Architecture Research Tool; a protein domain database

More...
SMARTi
View protein in SMART
SM00116 CBS, 2 hits

Superfamily database of structural and functional annotation

More...
SUPFAMi
SSF53686 SSF53686, 1 hit

TIGRFAMs; a protein family database

More...
TIGRFAMsi
TIGR01137 cysta_beta, 1 hit

PROSITE; a protein domain and family database

More...
PROSITEi
View protein in PROSITE
PS51371 CBS, 2 hits
PS00901 CYS_SYNTHASE, 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%5Flength">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%5Fsection">Sequence</a> section indicates if the <a href="http://www.uniprot.org/help/canonical%5Fand%5Fisoforms">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.

P46794-1 [UniParc]FASTAAdd to basket
« Hide
        10         20         30         40         50
MSAPEGPSKC TWTPNTTENT PHTTRRTPKK LIMDNILDNI GGTPLVRVNK
60 70 80 90 100
VSSDLECELV AKCEFFNAGG SVKDRIGHRM IVDAEESGRI KKGDTLIEPT
110 120 130 140 150
SGNTGIGLAL TAAIKGYKMI ITLPEKMSQE KVDVLKALGA EIIRTPTEAA
160 170 180 190 200
FDAPESHIGV AKKLNSEIPN SHILDQYGNP SNPLAHYDGT AEELLEQCEG
210 220 230 240 250
KIDMIVCTAG TGGTITGIAR KIKERLPNCI VVGVDPHGSI LAQPESLNNT
260 270 280 290 300
NKSYKIEGIG YDFIPNVLER KLVDQWIKTD DKESFIMARR LIKEEGLLCG
310 320 330 340 350
GSSGSAMVGA LLAAKQLKKG QRCVVLLADS IRNYMTKHLN DDWLVDNGFV
360 370 380 390 400
DPEYKTKDQQ EEEKYHGATV KDLTLPKPIT ISATTTCAAA VQLLQQYGFD
410 420 430 440 450
QLPVVSESKK VLGQLTLGNL LSHIASKKAV PTDAVSKVMF RFTKNEKYIP
460 470 480 490
ITQSTSLATL SKFFENHSSA IVTENDEIIS IVTKIDLLTY LMKSQQKN
Length:498
Mass (Da):54,458
Last modified:December 4, 2007 - v2
<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:i31FD69EFB68B6432
GO

<p>This subsection of the 'Sequence' section reports difference(s) between the protein sequence shown in the UniProtKB entry and other available protein sequences derived from the same gene.<p><a href='/help/sequence_caution' target='_top'>More...</a></p>Sequence cautioni

The sequence AAA70099 differs from that shown. Reason: Frameshift.Curated

Experimental Info

Feature keyPosition(s)DescriptionActionsGraphical viewLength
<p>This subsection of the 'Sequence' section reports difference(s) between the canonical sequence (displayed by default in the entry) and the different sequence submissions merged in the entry. These various submissions may originate from different sequencing projects, different types of experiments, or different biological samples. Sequence conflicts are usually of unknown origin.<p><a href='/help/conflict' target='_top'>More...</a></p>Sequence conflicti140A → G in AAA70099 (Ref. 1) Curated1
Sequence conflicti300G → A in AAA70099 (Ref. 1) Curated1

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
U27536 mRNA Translation: AAA70099.1 Frameshift.
AAFI02000003 Genomic DNA Translation: EAL73145.1

NCBI Reference Sequences

More...
RefSeqi
XP_647501.1, XM_642409.1

Genome annotation databases

Ensembl protists genome annotation project

More...
EnsemblProtistsi
EAL73145; EAL73145; DDB_G0267386

Database of genes from NCBI RefSeq genomes

More...
GeneIDi
8616308

KEGG: Kyoto Encyclopedia of Genes and Genomes

More...
KEGGi
ddi:DDB_G0267386

<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
U27536 mRNA Translation: AAA70099.1 Frameshift.
AAFI02000003 Genomic DNA Translation: EAL73145.1
RefSeqiXP_647501.1, XM_642409.1

3D structure databases

SMRiP46794
ModBaseiSearch...

Protein-protein interaction databases

STRINGi44689.DDB0191292

Proteomic databases

PaxDbiP46794
PRIDEiP46794

Genome annotation databases

EnsemblProtistsiEAL73145; EAL73145; DDB_G0267386
GeneIDi8616308
KEGGiddi:DDB_G0267386

Organism-specific databases

dictyBaseiDDB_G0267386 cysB

Phylogenomic databases

eggNOGiKOG1252 Eukaryota
COG0031 LUCA
HOGENOMiCLU_021018_0_0_1
InParanoidiP46794
KOiK01697
OMAiMTLVDWT
PhylomeDBiP46794

Enzyme and pathway databases

UniPathwayiUPA00136;UER00201
ReactomeiR-DDI-1614603 Cysteine formation from homocysteine

Miscellaneous databases

Protein Ontology

More...
PROi
PR:P46794

Family and domain databases

Gene3Di3.40.50.1100, 2 hits
InterProiView protein in InterPro
IPR000644 CBS_dom
IPR005857 Cysta_beta_synth
IPR001216 P-phosphate_BS
IPR001926 PLP-dep
IPR036052 Trypto_synt_PLP_dependent
PfamiView protein in Pfam
PF00571 CBS, 2 hits
PF00291 PALP, 1 hit
SMARTiView protein in SMART
SM00116 CBS, 2 hits
SUPFAMiSSF53686 SSF53686, 1 hit
TIGRFAMsiTIGR01137 cysta_beta, 1 hit
PROSITEiView protein in PROSITE
PS51371 CBS, 2 hits
PS00901 CYS_SYNTHASE, 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 nameiCBS_DICDI
<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: P46794
Secondary accession number(s): Q55FN2
<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%5Fand%5Fisoforms">canonical sequence</a> are also displayed.<p><a href='/help/entry_history' target='_top'>More...</a></p>Entry historyiIntegrated into UniProtKB/Swiss-Prot: November 1, 1995
Last sequence update: December 4, 2007
Last modified: February 26, 2020
This is version 139 of the entry and version 2 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 statusiReviewed (UniProtKB/Swiss-Prot)

<p>This section contains any relevant information that doesn't fit in any other defined sections<p><a href='/help/miscellaneous_section' target='_top'>More...</a></p>Miscellaneousi

Keywords - Technical termi

Reference proteome

Documents

  1. PATHWAY comments
    Index of metabolic and biosynthesis pathways
  2. SIMILARITY comments
    Index of protein domains and families
  3. Dictyostelium discoideum
    Dictyostelium discoideum: entries, gene names and cross-references to dictyBase
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