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On One Page

Quickview |

Gene |

Product(s) |

Expression|

Evolution |

References |

Quickview

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Standard Name	mrcB
Gene Synonym(s)	ECK0148, b0149, JW0145, pbpF, ponB^[1], ponB
Product Desc.	MrcB^[2]^[3]; Component of penicillin-binding protein 1B^[3] Murein polymerase, PBP1B; bifunctional murein transglycosylase and transpeptidase; penicillin-binding protein 1B; dimeric^[4]
Product Synonyms(s)	fused glycosyl transferase^[1], transpeptidase^[1], B0149^[2]^[1], PonB^[2]^[1], PbpF^[2]^[1], MrcB^[2]^[1], PBP1B^[2]^[1] , ECK0148, JW0145, pbpF, ponB, b0149
Function from GO	<GO_nr />
Knock-Out Phenotype
Regulation/Expression	transcription unit(s): mrcB^[2]
Regulation/Activity
Quick Links
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Notes

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MrcB is part of a complex with MltA and MipA. The N-terminal transglycosylase activity polymerizes the glycan backbone and is penicillin-insensitive. The C-terminal transpeptidase activity crosslinks the muramic peptides and is penicillin-sensitive. Full length MrcB is the alpha isoform. A second in vivo ATG start at codon 46 produces the 799 aa gamma isoform. Murein polymerase is an essential function satisfied by either MrcA or MrcB. Mutants have elevated OM vesiculation (McBroom, 2006). MrcB is a membrane-bound periplasmic enzyme that has an uncleaved signal anchor.^[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	mrcB
Mnemonic	Murein cluster c
Synonyms	ECK0148, b0149, JW0145, pbpF, ponB^[1], ponB
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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	3.55 minutes	MG1655: 164730..167264 <gbrowseImage> name=NC_000913:164730..167264 source=MG1655 preset=GeneLocation </gbrowseImage>	EcoCyc GBrowse(MG1655)	FASTA Dump EcoCyc Sequence Dump
REL606		NC_012967: 167581..170106 <gbrowseImage> name=NC_012967:167581..170106 source=REL606 preset=GeneLocation </gbrowseImage>	GBrowse (REL606)	FASTA Dump
BW2952		NC_012759: 164729..167263 <gbrowseImage> name=NC_012759:164729..167263 source=BW2952 preset=GeneLocation </gbrowseImage>	GBrowse (BW2952)	FASTA Dump
W3110		W3110: 164730..167264 <gbrowseImage> name=NC_007779:164730..167264 source=W3110 preset=GeneLocation </gbrowseImage>	GBrowse(W3110)	FASTA Dump
DH10B		DH10B: 138834..141368 <gbrowseImage> name=NC_010473:138834..141368 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)	Phenotype: Description	Reference	Availability	Comments
mrcB(del) (Keio:JW0145)	deletion	deletion		PMID:16738554	Shigen CGSC8415^[5]
mrcBE233Q		E233Q	Loss of wild-type glycan chain elongation activity. No complementation in strain defective in PBP-1b			seeded from UniProt:P02919
mrcBD234N		D234N	7-fold decrease in catalytic activity. No complementation in strain defective in PBP-1b			seeded from UniProt:P02919
mrcBE290Q		E290Q	11-fold decrease in catalytic activity. Shows complementation activity in strain defective in PBP-1b			seeded from UniProt:P02919
mrcB704					CGSC:11228
ΔmrcB765::kan				PMID:16738554	CGSC:101948
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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
JW0145	Plasmid clone	Shigen	PMID:16769691 Status:Clone OK Primer 1:GCCGCCGGGAATGACCGCGAGCC Primer 2:CCATTACTACCAAACATATCCTT
15A7	Kohara Phage	Genobase	PMID:3038334
zad-220::Tn10	Linked marker	CAG12025 = CGSC7326^[5]	est. P1 cotransduction: 56% ^[6]
yafC502::Tn10	Linked marker	CAG18436 = CGSC7328^[5]	est. P1 cotransduction: 2% ^[6] Synonyms:zae-502::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:EG10605	Escherichia coli str. K-12 substr. MG1655
EcoGene	EcoGene:EG10605	Escherichia coli str. K-12 substr. MG1655
RegulonDB	RegulonDB:ECK120000598	Escherichia coli str. K-12 substr. MG1655
NCBI (EcoliWiki Page)	GeneID:944843	Escherichia coli str. K-12 substr. MG1655
EchoBASE	EchoBASE:EB0600	Escherichia coli str. K-12 substr. MG1655
ASAP	ASAP:ABE-0000516	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	MrcB
Synonyms	fused glycosyl transferase^[1], transpeptidase^[1], B0149^[2]^[1], PonB^[2]^[1], PbpF^[2]^[1], MrcB^[2]^[1], PBP1B^[2]^[1] , ECK0148, JW0145, pbpF, ponB, b0149
Product description	MrcB^[2]^[3]; Component of penicillin-binding protein 1B^[3] Murein polymerase, PBP1B; bifunctional murein transglycosylase and transpeptidase; penicillin-binding protein 1B; dimeric^[4]
EC number (for enzymes)	2.4.1.129^[1] 3.4.-.-^[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:0005887	integral to plasma membrane				C	Seeded from Riley et al 2006 ^[1].	Missing: evidence, reference
	GO:0005886	plasma membrane	GOA:spkw SP_KW:GO_REF:0000004	IEA: Inferred from Electronic Annotation	SP_KW:KW-0997	C	Seeded from EcoCyc (v14.0)	complete
	GO:0005886	plasma membrane	GOA:spkw SP_KW:GO_REF:0000004	IEA: Inferred from Electronic Annotation	SP_KW:KW-1003	C	Seeded from EcoCyc (v14.0)	complete
	GO:0008955	peptidoglycan glycosyltransferase activity	PMID:6389538	IDA: Inferred from Direct Assay		F		complete
	GO:0051518	positive regulation of bipolar cell growth	PMID:330236	IDA: Inferred from Direct Assay		P	Cephaloridine has a high affinity for PBP1B. When this happens, cell elongation is inhibited, causing the cell to lyse.	complete
	GO:0009002	serine-type D-Ala-D-Ala carboxypeptidase activity	PMID:6389538	IDA: Inferred from Direct Assay		F		complete
	GO:0008658	penicillin binding	GOA:interpro GO_REF:0000002	IEA: Inferred from Electronic Annotation	InterPro:IPR001460	F	Seeded from EcoCyc (v14.0)	complete
	GO:0008955	peptidoglycan glycosyltransferase activity	GOA:interpro GO_REF:0000002	IEA: Inferred from Electronic Annotation	InterPro:IPR011813	F	Seeded from EcoCyc (v14.0)	complete
	GO:0008955	peptidoglycan glycosyltransferase activity	GOA:spec GO_REF:0000003	IEA: Inferred from Electronic Annotation	EC:2.4.1.129	F	Seeded from EcoCyc (v14.0)	complete
	GO:0009252	peptidoglycan biosynthetic process	GOA:interpro GO_REF:0000002	IEA: Inferred from Electronic Annotation	InterPro:IPR001264	P	Seeded from EcoCyc (v14.0)	complete
	GO:0009252	peptidoglycan biosynthetic process	PMID:16569861	IMP: Inferred from Mutant Phenotype		P	Table 1 shows a PBP1B deficient strain produce lipid II instead of peptidoglycan.	complete
	GO:0009252	peptidoglycan biosynthetic process	GOA:spkw SP_KW:GO_REF:0000004	IEA: Inferred from Electronic Annotation	SP_KW:KW-0573	P	Seeded from EcoCyc (v14.0)	complete
	GO:0009274	peptidoglycan-based cell wall	GOA:interpro GO_REF:0000002	IEA: Inferred from Electronic Annotation	InterPro:IPR001264	C	Seeded from EcoCyc (v14.0)	complete
	GO:0009274	peptidoglycan-based cell wall	GOA:interpro GO_REF:0000002	IEA: Inferred from Electronic Annotation	InterPro:IPR011813	C	Seeded from EcoCyc (v14.0)	complete
	GO:0016020	membrane	GOA:spkw SP_KW:GO_REF:0000004	IEA: Inferred from Electronic Annotation	SP_KW:KW-0472	C	Seeded from EcoCyc (v14.0)	complete
	GO:0016020	membrane	PMID:16858726	IDA: Inferred from Direct Assay		C	Seeded from EcoCyc (v14.0)	complete
	GO:0016021	integral to membrane	GOA:spkw SP_KW:GO_REF:0000004	IEA: Inferred from Electronic Annotation	SP_KW:KW-0812	C	Seeded from EcoCyc (v14.0)	complete
	GO:0016021	integral to membrane	GO_REF:0000023	IEA: Inferred from Electronic Annotation	SP_SL:SL-9906	C	Seeded from EcoCyc (v14.0)	complete
	GO:0046677	response to antibiotic	GOA:interpro GO_REF:0000002	IEA: Inferred from Electronic Annotation	InterPro:IPR011813	P	Seeded from EcoCyc (v14.0)	complete
	GO:0046677	response to antibiotic	PMID:371539	IDA: Inferred from Direct Assay	SP_KW:KW-0046	P	Table 1 shows Cephalosporin Beta-Lactams exhibit high affinity for PBP1B.	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 penicillin-binding protein 1B	could be indirect
Protein	talB		PMID:19402753	LCMS(ID Probability):99.6
Protein	hupA		PMID:19402753	LCMS(ID Probability):99.6
Protein	hemB		PMID:19402753	LCMS(ID Probability):99.6
Protein	ppsA		PMID:19402753	LCMS(ID Probability):99.6
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Notes

Localization

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

Compartment	Description	Evidence	Reference/Source	Notes
plasma membrane
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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 MAGNDREPIG RKGKPTRPVK QKVSRRRYED DDDYDDYDDY EDEEPMPRKG KGKGKGRKPR GKRGWLWLLL KLAIVFAVLI AIYGVYLDQK IRSRIDGKVW QLPAAVYGRM VNLEPDMTIS KNEMVKLLEA TQYRQVSKMT RPGEFTVQAN SIEMIRRPFD FPDSKEGQVR ARLTFDGDHL ATIVNMENNR QFGFFRLDPR LITMISSPNG EQRLFVPRSG FPDLLVDTLL ATEDRHFYEH DGISLYSIGR AVLANLTAGR TVQGASTLTQ QLVKNLFLSS ERSYWRKANE AYMALIMDAR YSKDRILELY MNEVYLGQSG DNEIRGFPLA SLYYFGRPVE ELSLDQQALL VGMVKGASIY NPWRNPKLAL ERRNLVLRLL QQQQIIDQEL YDMLSARPLG VQPRGGVISP QPAFMQLVRQ ELQAKLGDKV KDLSGVKIFT TFDSVAQDAA EKAAVEGIPA LKKQRKLSDL ETAIVVVDRF SGEVRAMVGG SEPQFAGYNR AMQARRSIGS LAKPATYLTA LSQPKIYRLN TWIADAPIAL RQPNGQVWSP QNDDRRYSES GRVMLVDALT RSMNVPTVNL GMALGLPAVT ETWIKLGVPK DQLHPVPAML LGALNLTPIE VAQAFQTIAS GGNRAPLSAL RSVIAEDGKV LYQSFPQAER AVPAQAAYLT LWTMQQVVQR GTGRQLGAKY PNLHLAGKTG TTNNNVDTWF AGIDGSTVTI TWVGRDNNQP TKLYGASGAM SIYQRYLANQ TPTPLNLVPP EDIADMGVDY DGNFVCSGGM RILPVWTSDP QSLCQQSEMQ QQPSGNPFDQ SSQPQQQPQQ QPAQQEQKDS DGVAGWIKDM FGSN
Length	844
Mol. Wt	94.294 kDa
pI	9.5 (calculated)
Extinction coefficient	116,200 - 116,450 (calc based on 30 Y, 13 W, and 2 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	References
Domain	472..744	PF00905 Penicillin binding protein transpeptidase domain	PMID:19920124
Domain	198..381	PF00912 Transglycosylase	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=mrcB taxon=562,83333 </beststructure>

Models

View models at:

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</protect>

Structure figures

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Notes

Gene Product Resources

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

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:16128142	Escherichia coli str. K-12 substr. MG1655
NCBI (Protein) (EcoliWiki Page)	GeneID:944843	Escherichia coli str. K-12 substr. MG1655
ASAP	ASAP:ABE-0000516	Escherichia coli str. K-12 substr. MG1655
UniProt (EcoliWiki Page)	UniProtKB/Swiss-Prot:P02919	Escherichia coli str. K-12 substr. MG1655
EcoCyc	EcoCyc:EG10605	Escherichia coli str. K-12 substr. MG1655
EcoGene	EcoGene:EG10605	Escherichia coli str. K-12 substr. MG1655
NCBI (Gene) (EcoliWiki Page)	GeneID:944843	Escherichia coli str. K-12 substr. MG1655
RegulonDB	RegulonDB:ECK120000598	Escherichia coli str. K-12 substr. MG1655
EchoBASE	EchoBASE:EB0600	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	Ecoli K-12	0.945+/-0.065	Molecules/cell	Medium: Temperature (°C): Doubling time (min): Growth Rate(min): * Growth phase: other: *		Single Molecule Fluorescence	PMID:20671182
mRNA	Ecoli K-12	0.023875296	Molecules/cell	Medium: Temperature (°C): Doubling time (min): Growth Rate(min): * Growth phase: other: *		by RNA_Seq	PMID:20671182
Protein	E. coli K-12 MG1655	521	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	139	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	259	molecules/cell/generation	Medium: MOPS Complete without Methionine Temperature (°C): 37 Doubling time (min): *Growth phase: OD: other:	Ribosome Profiling		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)
mrcB
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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_000913:164710..164750 source=MG1655 type=Gene+DNA_+Protein preset=Nterminus </gbrowseImage> This picture shows the sequence around the N-terminus.

</protect>

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:b0149 (EcoliWiki Page)	NCBI GEO profiles for mrcB
microarray	GenExpDB:b0149 (EcoliWiki Page)	Summary of data for mrcB 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
	GFP Fusion	Intergenic region (164452..164755) fused to gfpmut2.	OpenBioSystems	GFP fusion described in Zaslaver, et al. Plate:109-AZ18; Well:E5^[7]
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Notes

Accessions Related to mrcB Expression

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

Database	Accession	Notes
EcoCyc	EcoCyc:EG10605	Escherichia coli str. K-12 substr. MG1655
EchoBASE	EchoBASE:EB0600	Escherichia coli str. K-12 substr. MG1655
EcoliGenExpDB (EcoliWiki Page)	EcoliGenExpDB:b0149
EcoGene	EcoGene:EG10605	Escherichia coli str. K-12 substr. MG1655
RegulonDB	RegulonDB:ECK120000598	Escherichia coli str. K-12 substr. MG1655
ASAP	ASAP:ABE-0000516	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	MRCB	From SHIGELLACYC
E. coli O157	MRCB	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)	PF00905 Penicillin binding protein transpeptidase domain
Superfamily (EcoliWiki Page)	SUPERFAMILY:56601
Pfam (EcoliWiki Page)	PF00912 Transglycosylase
EcoCyc	EcoCyc:EG10605	Escherichia coli str. K-12 substr. MG1655
EcoGene	EcoGene:EG10605	Escherichia coli str. K-12 substr. MG1655
RegulonDB	RegulonDB:ECK120000598	Escherichia coli str. K-12 substr. MG1655
EchoBASE	EchoBASE:EB0600	Escherichia coli str. K-12 substr. MG1655
ASAP	ASAP:ABE-0000516	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 ^1.12 ^1.13 ^1.14 ^1.15 ^1.16 ^1.17 ^1.18 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 ^2.11 ^2.12 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 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).
↑ Zaslaver, A et al. (2006) A comprehensive library of fluorescent transcriptional reporters for Escherichia coli. Nat. Methods 3 623-8 PubMed

mrcB:On One Page

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Notes

Gene

Nomenclature

Notes

Location(s) and DNA Sequence

Notes

Sequence Features

Notes

Alleles and Phenotypes

Notes

Genetic Interactions

Notes

Genetic Resources

Notes

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 mrcB Expression

Notes

Links

Evolution

Homologs in Other Organisms

Do-It-Yourself Web Tools

Notes

Families

Notes

Links

References

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