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Expression|

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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

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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]

Gene

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Nomenclature

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See Help:Gene_nomenclature for help with entering information in the Gene Nomenclature table.

Standard name	chbB
Mnemonic	Chitobiose
Synonyms	ECK1736, b1738, JW1727, celA^[1], celA
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Notes

Location(s) and DNA Sequence

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<protect> See Help:Gene_location for help entering information in the Gene Location and DNA sequence table.

Strain	Map location	Genome coordinates	Genome browsers	Sequence links
MG1655	39.21 minutes	MG1655: 1819643..1819323 <gbrowseImage> name=NC_000913:1819323..1819643 source=MG1655 preset=GeneLocation </gbrowseImage>	EcoCyc GBrowse(MG1655)	FASTA Dump EcoCyc Sequence Dump
BW2952		NC_012759: 1711382..1711702 <gbrowseImage> name=NC_012759:1711382..1711702 source=BW2952 preset=GeneLocation </gbrowseImage>	GBrowse (BW2952)	FASTA Dump
W3110		W3110: 1823333..1823013 <gbrowseImage> name=NC_007779:1823013..1823333 source=W3110 preset=GeneLocation </gbrowseImage>	GBrowse(W3110)	FASTA Dump
DH10B		DH10B: 1910214..1909894 <gbrowseImage> name=NC_010473:1909894..1910214 source=DH10B preset=GeneLocation </gbrowseImage>	GBrowse(DH10B)	FASTA Dump
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Notes

Sequence Features

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See Help:Gene_sequence_features for help in entering sequence features in EcoliWiki.

Feature Type	Strain	Genomic Location	Evidence	Reference	Notes
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Notes

Alleles and Phenotypes

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See Help:Gene_alleles for how to enter or edit alleles and phenotypes in EcoliWiki.

Allele	Nt change(s)	AA change(s)	Reference	Availability	Comments
ΔchbB (Keio:JW1727)	deletion	deletion	PMID:16738554	Shigen CGSC9459^[5]
celA::Tn5KAN-2 (FB20444)	Insertion at nt 238 in Plus orientation		PMID:15262929	E. coli Genome Project:FB20444	does not contain pKD46
celA::Tn5KAN-2 (FB20445)	Insertion at nt 238 in Plus orientation		PMID:15262929	E. coli Genome Project:FB20445	contains pKD46
ΔchbB737::kan			PMID:16738554	CGSC:100286
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Notes

Genetic Interactions

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Interactor	Interaction	Allele	Score(s)	Reference(s)	Accessions	Notes
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Notes

Genetic Resources

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See Help:Gene_resources for help entering information into the Genetic Resources table.

Resource	Resource Type	Source	Notes/Reference
JW1727	Plasmid clone	Shigen	PMID:16769691 Status:Clone OK Primer 1:GCCGAAAAGAAACACATTTATCT Primer 2:CCATTTGCTGCGGCTTTTTTAAT
19B6	Kohara Phage	Genobase	PMID:3038334
4F7	Kohara Phage	Genobase	PMID:3038334
5E12	Kohara Phage	Genobase	PMID:3038334
zdi-925::Tn10	Linked marker	CAG12151 = CGSC7385^[5]	est. P1 cotransduction: 16% ^[6] Synonyms:zdh-925::Tn10
zdj-276::Tn10	Linked marker	CAG18464 = CGSC7387^[5]	est. P1 cotransduction: 63% ^[6] Synonyms:zdi-276::Tn10
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Notes

Accessions in Other Databases

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See Help:Gene_accessions for help with entering information into the Gene Accessions table.

Database	Accession	Notes
EcoCyc	EcoCyc:EG10140	Escherichia coli str. K-12 substr. MG1655
EcoGene	EcoGene:EG10140	Escherichia coli str. K-12 substr. MG1655
RegulonDB	RegulonDB:ECK120000136	Escherichia coli str. K-12 substr. MG1655
NCBI (EcoliWiki Page)	GeneID:945339	Escherichia coli str. K-12 substr. MG1655
EchoBASE	EchoBASE:EB0138	Escherichia coli str. K-12 substr. MG1655
ASAP	ASAP:ABE-0005797	Escherichia coli str. K-12 substr. MG1655
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Notes

Links

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Name	URL	Comments
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Product(s)

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Nomenclature

See Help:Product_nomenclature for help entering or editing information in this section of EcoliWiki.

Standard name	ChbB
Synonyms	N,N'-diacetylchitobiose-specific enzyme IIB component of PTS^[1], B1738^[2]^[1], ChbB^[2]^[1], CelA^[2]^[1] , celA, ECK1736, JW1727, b1738
Product description	ChbB^[2]^[3]; Component of EIIChb^[2]^[3] N,N'-diacetylchitobiose utilization, enzyme IIB(Chb) of the PTS transport system^[4]
EC number (for enzymes)	2.7.1.69^[1]
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Notes

Function

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<protect> Gene Ontology
See Help:Gene_ontology for help entering or editing GO terms and GO annotations in EcoliWiki.

Qualifier	GO ID	GO term name	Reference	Evidence Code	with/from	Aspect	Notes	Status
	GO:0030288	outer membrane-bounded periplasmic space				C	Seeded from Riley et al 2006 ^[1].	Missing: evidence, reference
	GO:0005351	sugar:hydrogen symporter activity	GOA:interpro GO_REF:0000002	IEA: Inferred from Electronic Annotation	InterPro:IPR003501	F	Seeded from EcoCyc (v14.0)	complete
	GO:0005529	sugar binding	GOA:interpro GO_REF:0000002	IEA: Inferred from Electronic Annotation	InterPro:IPR014350	F	Seeded from EcoCyc (v14.0)	complete
	GO:0005737	cytoplasm	GOA:spkw SP_KW:GO_REF:0000004	IEA: Inferred from Electronic Annotation	SP_KW:KW-0963	C	Seeded from EcoCyc (v14.0)	complete
	GO:0005737	cytoplasm	GO_REF:0000023	IEA: Inferred from Electronic Annotation	SP_SL:SL-0086	C	Seeded from EcoCyc (v14.0)	complete
	GO:0006810	transport	GOA:spkw SP_KW:GO_REF:0000004	IEA: Inferred from Electronic Annotation	SP_KW:KW-0813	P	Seeded from EcoCyc (v14.0)	complete
	GO:0008643	carbohydrate transport	GOA:spkw SP_KW:GO_REF:0000004	IEA: Inferred from Electronic Annotation	SP_KW:KW-0762	P	Seeded from EcoCyc (v14.0)	complete
	GO:0008982	protein-N(PI)-phosphohistidine-sugar phosphotransferase activity	GOA:interpro GO_REF:0000002	IEA: Inferred from Electronic Annotation	InterPro:IPR013012	F	Seeded from EcoCyc (v14.0)	complete
	GO:0008982	protein-N(PI)-phosphohistidine-sugar phosphotransferase activity	GOA:interpro GO_REF:0000002	IEA: Inferred from Electronic Annotation	InterPro:IPR014350	F	Seeded from EcoCyc (v14.0)	complete
	GO:0008982	protein-N(PI)-phosphohistidine-sugar phosphotransferase activity	GOA:spec GO_REF:0000003	IEA: Inferred from Electronic Annotation	EC:2.7.1.69	F	Seeded from EcoCyc (v14.0)	complete
	GO:0009401	phosphoenolpyruvate-dependent sugar phosphotransferase system	GOA:interpro GO_REF:0000002	IEA: Inferred from Electronic Annotation	InterPro:IPR003501	P	Seeded from EcoCyc (v14.0)	complete
	GO:0009401	phosphoenolpyruvate-dependent sugar phosphotransferase system	GOA:interpro GO_REF:0000002	IEA: Inferred from Electronic Annotation	InterPro:IPR013012	P	Seeded from EcoCyc (v14.0)	complete
	GO:0009401	phosphoenolpyruvate-dependent sugar phosphotransferase system	GOA:interpro GO_REF:0000002	IEA: Inferred from Electronic Annotation	InterPro:IPR014350	P	Seeded from EcoCyc (v14.0)	complete
	GO:0009401	phosphoenolpyruvate-dependent sugar phosphotransferase system	GOA:spkw SP_KW:GO_REF:0000004	IEA: Inferred from Electronic Annotation	SP_KW:KW-0598	P	Seeded from EcoCyc (v14.0)	complete
	GO:0016301	kinase activity	GOA:spkw SP_KW:GO_REF:0000004	IEA: Inferred from Electronic Annotation	SP_KW:KW-0418	F	Seeded from EcoCyc (v14.0)	complete
	GO:0016740	transferase activity	GOA:spkw SP_KW:GO_REF:0000004	IEA: Inferred from Electronic Annotation	SP_KW:KW-0808	F	Seeded from EcoCyc (v14.0)	complete
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Interactions See Help:Product_interactions for help entering or editing information about gene product interactions in this section of EcoliWiki.

Partner Type	Partner	Notes	References	Evidence
Protein	Subunits of EIIChb	could be indirect
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Notes

Localization

See Help:Product_localization for how to add or edit information in this section of EcoliWiki.

Compartment	Evidence	Reference/Source
plasma membrane		From EcoCyc^[3]
Inner membrane	PMID:2092358	EchoLocation:chbB
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Notes

Structure and Physical Properties

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<protect> Physical Properties See Help:Product_physical_properties for help entering or editing information about the physical properties of this gene product.

Name
Sequence	at EcoCyc MEKKHIYLFC SAGMSTSLLV SKMRAQAEKY EVPVIIEAFP ETLAGEKGQN ADVVLLGPQI AYMLPEIQRL LPNKPVEVID SLLYGKVDGL GVLKAAVAAI KKAAAN
Length	106
Mol. Wt	11.426 kDa
pI	8.3 (calculated)
Extinction coefficient	5,960 - 6,085 (calc based on 4 Y, 0 W, and 1 C residues)
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Domains/Motifs/Modification Sites

See Help:Product_domains_motifs for help entering or editing information in this section of EcoliWiki.

Type	Residues	Description	Notes	References
Domain	5..95	PF02302 PTS system, Lactose/Cellobiose specific IIB subunit		PMID:19920124
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<motif_map/>

Structure
See Help:Product_structure for help entering or editing information in this section of EcoliWiki.

Structures

<beststructure> gene=chbB taxon=562,83333 </beststructure>

Models

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Structure figures

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Notes

Gene Product Resources

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Resource type	Source	Notes/Reference
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Notes

Accessions in Other Databases

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See Help:Gene_accessions for help with entering information into the Gene Accessions table.

Database	Accession	Notes
NCBI (Protein) (EcoliWiki Page)	GI:16129692	Escherichia coli str. K-12 substr. MG1655
NCBI (Protein) (EcoliWiki Page)	GeneID:945339	Escherichia coli str. K-12 substr. MG1655
ASAP	ASAP:ABE-0005797	Escherichia coli str. K-12 substr. MG1655
UniProt (EcoliWiki Page)	UniProtKB/Swiss-Prot:P69795	Escherichia coli str. K-12 substr. MG1655
EcoCyc	EcoCyc:EG10140	Escherichia coli str. K-12 substr. MG1655
EcoGene	EcoGene:EG10140	Escherichia coli str. K-12 substr. MG1655
NCBI (Gene) (EcoliWiki Page)	GeneID:945339	Escherichia coli str. K-12 substr. MG1655
RegulonDB	RegulonDB:ECK120000136	Escherichia coli str. K-12 substr. MG1655
EchoBASE	EchoBASE:EB0138	Escherichia coli str. K-12 substr. MG1655
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Notes

Links

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Name	URL	Comments
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Expression

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Overview

This is a placeholder for a summary statement on how expression of this gene product is regulated. You can help EcoliWiki by becoming a user and writing/editing this statement.

Cellular Levels

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See Help:Cellular levels

Molecule	Organism or Strain	Value	Units	Experimental Conditions	Assay used	Notes	Reference(s)
Protein	E. coli K-12 MG1655	264	molecules/cell/generation	Medium: MOPS Complete Temperature (°C): 37 Doubling time (min): *Growth phase: OD: other:	Ribosome Profiling		PMID: 24766808
Protein	E. coli K-12 MG1655	158	molecules/cell/generation	Medium: MOPS Minimal Temperature (°C): 37 Doubling time (min): *Growth phase: OD: other:	Ribosome Profiling		PMID: 24766808
Protein	E. coli K-12 MG1655	147^a	molecules/cell/generation	Medium: MOPS Complete without Methionine Temperature (°C): 37 Doubling time (min): *Growth phase: OD: other:	Ribosome Profiling	Low confidence in the sequencing data set.	PMID: 24766808
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Notes

Transcription and Transcriptional Regulation

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See Help:Expression_transcription for help entering or editing information in this section of EcoliWiki.

Transcription unit(s)
chbBCARFG
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Figure courtesy of RegulonDB

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Notes

This is a placeholder for a summary statement about how transcription of this gene is regulated. You can help EcoliWiki by becoming a user and writing/editing this statement.

Translation and Regulation of Translation

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<protect><gbrowseImage> name=NC_000913:1819623..1819663 source=MG1655 flip=1 type=Gene+DNA_+Protein preset=Nterminus </gbrowseImage> This picture shows the sequence around the N-terminus.

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Notes

This is a placeholder for a summary statement about how translation of this gene product is regulated. You can help EcoliWiki by becoming a user and writing/editing this statement.

Turnover and Regulation of Turnover

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Notes

This is a placeholder for a summary statement about turnover of this gene product. You can help EcoliWiki by becoming a user and writing/editing this statement.

Experimental

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<protect> Mutations Affecting Expression See Help:Expression_mutations for help entering or editing information in this section of EcoliWiki.

Allele Name	Mutation	Phenotype	Reference
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Expression Studies See Help:Expression_studies for help entering or editing information in this section of EcoliWiki.

Type	Reference	Notes
microarray	GEO Profiles:b1738 (EcoliWiki Page)	NCBI GEO profiles for chbB
microarray	GenExpDB:b1738 (EcoliWiki Page)	Summary of data for chbB from multiple microarray studies
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Expression Resources See Help:Expression_resources for help entering or editing information in this section of EcoliWiki.

Resource Name	Resource Type	Description	Source	Notes
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Notes

Accessions Related to chbB Expression

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See Help:Gene_accessions for help with entering information into the Gene Accessions table.

Database	Accession	Notes
EcoCyc	EcoCyc:EG10140	Escherichia coli str. K-12 substr. MG1655
EchoBASE	EchoBASE:EB0138	Escherichia coli str. K-12 substr. MG1655
EcoliGenExpDB (EcoliWiki Page)	EcoliGenExpDB:b1738
EcoGene	EcoGene:EG10140	Escherichia coli str. K-12 substr. MG1655
RegulonDB	RegulonDB:ECK120000136	Escherichia coli str. K-12 substr. MG1655
ASAP	ASAP:ABE-0005797	Escherichia coli str. K-12 substr. MG1655
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Notes

Links

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Name	URL	Comments
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Evolution

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Homologs in Other Organisms

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See Help:Evolution_homologs for help entering or editing information in this section of EcoliWiki.

Organism	Homologs (Statistics)	Comments
Shigella flexneri	CELA	From SHIGELLACYC
E. coli O157	CELA	From ECOO157CYC
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Do-It-Yourself Web Tools

Notes

Families

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See Help:Gene_accessions for help with entering information into the Gene Accessions table.

Database	Accession	Notes
Pfam (EcoliWiki Page)	PF02302 PTS system, Lactose/Cellobiose specific IIB subunit
Superfamily (EcoliWiki Page)	SUPERFAMILY:52794
EcoCyc	EcoCyc:EG10140	Escherichia coli str. K-12 substr. MG1655
EcoGene	EcoGene:EG10140	Escherichia coli str. K-12 substr. MG1655
RegulonDB	RegulonDB:ECK120000136	Escherichia coli str. K-12 substr. MG1655
EchoBASE	EchoBASE:EB0138	Escherichia coli str. K-12 substr. MG1655
ASAP	ASAP:ABE-0005797	Escherichia coli str. K-12 substr. MG1655
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Notes

Links

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Name	URL	Comments
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References

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See Help:References for how to manage references in EcoliWiki.

↑ ^1.00 ^1.01 ^1.02 ^1.03 ^1.04 ^1.05 ^1.06 ^1.07 ^1.08 ^1.09 ^1.10 ^1.11 Riley, M. et al. (2006) Nucleic Acids Res 34:1-6 (corrected supplemental data from B. Wanner)
↑ ^2.00 ^2.01 ^2.02 ^2.03 ^2.04 ^2.05 ^2.06 ^2.07 ^2.08 ^2.09 ^2.10 EcoCyc (release 10.6; 2007) Keseler, IM et al. (2005) Nucleic Acids Res. 33(Database issue):D334-7
↑ ^3.0 ^3.1 ^3.2 ^3.3 ^3.4 EcoCyc (release 11.1; 2007) Keseler, IM et al. (2005) Nucleic Acids Res. 33(Database issue):D334-7
↑ ^4.0 ^4.1 ^4.2 EcoGene: Rudd, KE (2000) EcoGene: a genome sequence database for Escherichia coli K-12. Nucleic Acids Res 28:60-4.
↑ ^5.0 ^5.1 ^5.2 CGSC: The Coli Genetics Stock Center
↑ ^6.0 ^6.1 The Tn10 insertion sites determined by Nichols et al. 1998 (PMID:9829956) were reannotated by alignment with E. coli K-12 genome sequence (GenBank accession NC_000913). P1 contransduction frequencies were calculated using the formula of Wu (PMID:5338813).

chbB:On One Page

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Gene

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Notes

Location(s) and DNA Sequence

Notes

Sequence Features

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Alleles and Phenotypes

Notes

Genetic Interactions

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Genetic Resources

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Accessions in Other Databases

Notes

Links

Product(s)

Nomenclature

Notes

Function

Notes

Localization

Notes

Structure and Physical Properties

Structure figures

Notes

Gene Product Resources

Notes

Accessions in Other Databases

Notes

Links

Expression

Overview

Cellular Levels

Notes

Transcription and Transcriptional Regulation

Notes

Translation and Regulation of Translation

Notes

Turnover and Regulation of Turnover

Notes

Experimental

Notes

Accessions Related to chbB Expression

Notes

Links

Evolution

Homologs in Other Organisms

Do-It-Yourself Web Tools

Notes

Families

Notes

Links

References

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