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{{Tab On|Quickview|chbB}}{{Tab|Gene|chbB}}{{Tab|Gene Product(s)|chbB}}{{Tab|Expression|chbB}}{{Tab|Evolution|chbB}}{{Tab|On One Page|chbB}}{{TabsBottom}}
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!{{table_heading_style}} |Gene Name
!align=left {{table_heading_style}} |Standard Name
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[[chbB:Gene|''chbB]]'' (synonyms: ''ECK1736, b1738, JW1727, celA, chbA'')<ref name='LIB:Riley_2006'/><ref name='LIB:EcoCyc10.6'/>
''chbB''
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!{{table_heading_style}} |Product(s)  
!align=left {{table_heading_style}} |Gene Synonym(s)
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[[chbB:Gene_Product(s)|ChbB product]]<ref name='LIB:Riley_2006'/>: N,N'-diacetylchitobiose-specific enzyme IIB component of PTS<ref name='LIB:Riley_2006'/>, B1738<ref name='LIB:EcoCyc10.6'/>, ChbB<ref name='LIB:EcoCyc10.6'/>, CelA<ref name='LIB:EcoCyc10.6'/>, ChbA<ref name='LIB:EcoCyc10.6'/>, [[:Category:Complex:EIIChb|EIIChb]]<ref name='LIB:EcoCyc10.6'/>
''ECK1736, b1738, JW1727, celA''<ref name='LIB:Riley_2006'/>, celA''
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!{{table_heading_style}} |Description
!align=left {{table_heading_style}} |Product Desc.
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ChbB<ref name='LIB:EcoCyc10.6'/><ref name='LIB:EcoCyc11.1'/>
ChbB<ref name='LIB:EcoCyc10.6'/><ref name='LIB:EcoCyc11.1'/>;


Component of [[:Category:Complex:EIIChb|EIIChb]]<ref name='LIB:EcoCyc10.6'/><ref name='LIB:EcoCyc11.1'/>


N,N'-diacetylchitobiose utilization, enzyme IIB(Chb) of the PTS transport system<ref name='LIB:EcoGene'/>
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!align=left {{table_heading_style}} |Product Synonyms(s)
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''N,N'-diacetylchitobiose-specific enzyme IIB component of PTS<ref name='LIB:Riley_2006'/>, B1738<ref name='LIB:EcoCyc10.6'/><ref name='LIB:Riley_2006'/>, ChbB<ref name='LIB:EcoCyc10.6'/><ref name='LIB:Riley_2006'/>, CelA<ref name='LIB:EcoCyc10.6'/><ref name='LIB:Riley_2006'/> , celA, ECK1736, JW1727, b1738''
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!align=left {{table_heading_style}} |Function from GO
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<GO_nr />
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!{{table_heading_style}} |Knock-Out Phenotype
!align=left {{table_heading_style}} |Knock-Out Phenotype
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!{{table_heading_style}} |Regulation/Expression
!align=left {{table_heading_style}} |Regulation/Expression
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transcription unit(s): [[:Category:txn_units:chbBCARFG|chbBCARFG]]<ref name='LIB:EcoCyc10.6'/>  
transcription unit(s): [[:Category:Txn_unit:chbBCARFG|chbBCARFG]]<ref name='LIB:EcoCyc10.6'/>  
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!{{table_heading_style}} |Regulation/Activity
!align=left {{table_heading_style}} |Regulation/Activity
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[[File:porteco.png|link=http://porteco.org/AjaxSearch.jsp?searchString=chbB&s=search]] [[File:EcoCyc.gif|link=http://biocyc.org/ECOLI/NEW-IMAGE?type=NIL&object=EG10140]] [[File:regulondb.jpg|link=http://regulondb.ccg.unam.mx/gene?term=ECK120000136&organism=ECK12&format=jsp&type=gene ]] <br/><br/> [[File:dnadisplay.png|link=http://ecoliwiki.net/tools/display_dna.php?gene=chbB&loc=MG1655%3A1819643..1819323,W3110%3A1823333..1823013,DH10B%3A1910214..1909894,BW2952%3A1711382..1711702]] [[File:proteindisplay.png|link=http://ecoliwiki.net/tools/display_protein.php?f=NC_000913&start=1711382&end=1711702&gene=chbB&aa=mekkhiylfcsagmstsllvskmraqaekyevpviieafpetlagekgqnadvvllgpqiaymlpeiqrllpnkpvevidsllygkvdglgvlkaavaaikkaaan]]&nbsp;&nbsp;  [[File:pubmed.jpg|link=http://www.ncbi.nlm.nih.gov/sites/entrez?db=pubmed&cmd=Search&Term=chbB+AND+escherichia+coli]]&nbsp;&nbsp;  [[File:textpresso.jpg|link=http://textpresso.tamu.edu/cgi-bin/textpresso/search?q=chbB]]&nbsp;&nbsp;
 
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==Notes==
===Notes===
{{BacktoTop}}
 
The chb operon is induced by N,N'-diacetylchitobiose.  The chb operon was previously thought to encode a cryptic cel operon for a cellobiose degradation system. The Cel+ phenotype is due to mutations making expression chitobiose-independent, but a fully induced operon did not support growth on cellobiose, implying a mutation altering the substrate specificity is needed; several candidate mutations were noted in Genbank, but not proven to alter the specificity of the system (Keyhani, 1997). In contrast, a later study claim that mutations making the operon expression high-level constitutive by chbR and nagC mutations are sufficient for the Cel+ phenotype and that no mutations altering substrate specificity are required (Kachroo, 2007).<ref name='LIB:EcoGene'/>
 




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==References==
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Latest revision as of 21:52, 27 May 2013

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Quickview   Gene   Gene Product(s)   Expression   Evolution   On One Page    
References Suggestions
Standard Name

chbB

Gene Synonym(s)

ECK1736, b1738, JW1727, celA[1], celA

Product Desc.

ChbB[2][3];

Component of EIIChb[2][3]

N,N'-diacetylchitobiose utilization, enzyme IIB(Chb) of the PTS transport system[4]

Product Synonyms(s)

N,N'-diacetylchitobiose-specific enzyme IIB component of PTS[1], B1738[2][1], ChbB[2][1], CelA[2][1] , celA, ECK1736, JW1727, b1738

Function from GO

<GO_nr />

Knock-Out Phenotype
Regulation/Expression

transcription unit(s): chbBCARFG[2]

Regulation/Activity
Quick Links



        

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Notes

[back to top]


The chb operon is induced by N,N'-diacetylchitobiose. The chb operon was previously thought to encode a cryptic cel operon for a cellobiose degradation system. The Cel+ phenotype is due to mutations making expression chitobiose-independent, but a fully induced operon did not support growth on cellobiose, implying a mutation altering the substrate specificity is needed; several candidate mutations were noted in Genbank, but not proven to alter the specificity of the system (Keyhani, 1997). In contrast, a later study claim that mutations making the operon expression high-level constitutive by chbR and nagC mutations are sufficient for the Cel+ phenotype and that no mutations altering substrate specificity are required (Kachroo, 2007).[4]



References

[back to top]


  1. ↑ 1.0 1.1 1.2 1.3 1.4 Riley, M. et al. (2006) Nucleic Acids Res 34:1-6 (corrected supplemental data from B. Wanner)
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 EcoCyc (release 10.6; 2007) Keseler, IM et al. (2005) Nucleic Acids Res. 33(Database issue):D334-7
  3. ↑ 3.0 3.1 EcoCyc (release 11.1; 2007) Keseler, IM et al. (2005) Nucleic Acids Res. 33(Database issue):D334-7
  4. ↑ 4.0 4.1 EcoGene: Rudd, KE (2000) EcoGene: a genome sequence database for Escherichia coli K-12. Nucleic Acids Res 28:60-4.
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