Escherichia coli K-12 substr. MG1655 Protein: molybdopterin-guanine dinucleotide biosynthesis adaptor protein

Gene: mobB Accession Numbers: EG11828 (EcoCyc), b3856, ECK3848

Synonyms: yihC

Regulation Summary Diagram: ?

Regulation summary diagram for mobB

Subunit composition of molybdopterin-guanine dinucleotide biosynthesis adaptor protein = [MobB]2
         molybdopterin-guanine dinucleotide biosynthesis adaptor protein = MobB

MobB weakly binds GTP (Kd of 2 µM) and has low GTPase activity. It also binds ATP, TTP and GDP with lower affinity [Eaves97]. MobB is not required for synthesis of the molybdenum cofactor MGD [Palmer96a], but its presence enhances in vitro activation of nitrate reductase [Palmer96a, Eaves97].

MobB directly interacts with MobA, MogA and MoeA [Magalon02]. In the presence of the enzyme-specific chaperone NarJ and the mature molybdenum cofactor, MobA, MobB, MoeA and MogA interact with apo-NarG [Vergnes04]. Crystal structures of MobB have been solved [McLuskey03, Rangarajan03].

The mob locus is expressed at a low level under both aerobic and anaerobic growth conditions [IobbiNivol95].

MobB: "molybdenum cofactor biosynthesis, chlB group, gene B [Shanmugam92]

Locations: cytosol

Map Position: [4,038,929 <- 4,039,456] (87.05 centisomes, 313°)
Length: 528 bp / 175 aa

Molecular Weight of Polypeptide: 19.363 kD (from nucleotide sequence), 19.5 kD (experimental) [Eaves97 ]

Molecular Weight of Multimer: 40.0 kD (experimental) [Eaves97]

Unification Links: ASAP:ABE-0012591 , DIP:DIP-10234N , EchoBASE:EB1775 , EcoGene:EG11828 , EcoliWiki:b3856 , Mint:MINT-1264474 , ModBase:P32125 , OU-Microarray:b3856 , PortEco:mobB , PR:PRO_000023266 , Protein Model Portal:P32125 , RefSeq:NP_418293 , RegulonDB:EG11828 , SMR:P32125 , String:511145.b3856 , UniProt:P32125

Relationship Links: InterPro:IN-FAMILY:IPR004435 , InterPro:IN-FAMILY:IPR027417 , InterPro:IN-FAMILY:IPR029007 , PDB:Structure:1NP6 , PDB:Structure:1P9N , Pfam:IN-FAMILY:PF03205

Gene-Reaction Schematic: ?

Gene-Reaction Schematic

GO Terms:

Biological Process: GO:0006777 - Mo-molybdopterin cofactor biosynthetic process Inferred by computational analysis [UniProtGOA11a, GOA01a]
Molecular Function: GO:0005515 - protein binding Inferred from experiment [Magalon02]
GO:0005525 - GTP binding Inferred from experiment Inferred by computational analysis [UniProtGOA11a, GOA01a, Eaves97]
GO:0042803 - protein homodimerization activity Inferred from experiment [Eaves97]
GO:0000166 - nucleotide binding Inferred by computational analysis [UniProtGOA11a]
Cellular Component: GO:0005829 - cytosol Inferred by computational analysis [DiazMejia09]

MultiFun Terms: metabolism biosynthesis of building blocks cofactors, small molecule carriers

Essentiality data for mobB knockouts: ?

Growth Medium Growth? T (°C) O2 pH Osm/L Growth Observations
LB enriched Yes 37 Aerobic 6.95   Yes [Gerdes03, Comment 1]
LB Lennox Yes 37 Aerobic 7   Yes [Baba06, Comment 2]
M9 medium with 1% glycerol Yes 37 Aerobic 7.2 0.35 Yes [Joyce06, Comment 3]
MOPS medium with 0.4% glucose Yes 37 Aerobic 7.2 0.22 Yes [Baba06, Comment 2]

Created 07-Oct-2013 by Keseler I , SRI International
Last-Curated ? 07-Oct-2013 by Keseler I , SRI International

Sequence Features

Protein sequence of molybdopterin-guanine dinucleotide biosynthesis adaptor protein with features indicated

Feature Class Location Citations Comment
Cleavage-of-Initial-Methionine 1
[Eaves97, IobbiNivol95]
Chain 2 -> 175
UniProt: Molybdopterin-guanine dinucleotide biosynthesis protein B;
Nucleotide-Phosphate-Binding-Region 17 -> 21
UniProt: GTP; Non-Experimental Qualifier: probable.
Nucleotide-Phosphate-Binding-Region 51 -> 54
UniProt: GTP; Non-Experimental Qualifier: potential;
Nucleotide-Phosphate-Binding-Region 100 -> 103
UniProt: GTP; Non-Experimental Qualifier: potential;

Gene Local Context (not to scale): ?

Gene local context diagram

Transcription Units:

Transcription-unit diagram

Transcription-unit diagram


Ingrid Keseler on Wed Jun 6, 2007:
Gene start position adjusted based on results from N-terminal sequencing by [IobbiNivol95 ].
1/26/1998 (pkarp) Merged genes G7811/b3856 and EG11828/yihC


Baba06: Baba T, Ara T, Hasegawa M, Takai Y, Okumura Y, Baba M, Datsenko KA, Tomita M, Wanner BL, Mori H (2006). "Construction of Escherichia coli K-12 in-frame, single-gene knockout mutants: the Keio collection." Mol Syst Biol 2;2006.0008. PMID: 16738554

DiazMejia09: Diaz-Mejia JJ, Babu M, Emili A (2009). "Computational and experimental approaches to chart the Escherichia coli cell-envelope-associated proteome and interactome." FEMS Microbiol Rev 33(1);66-97. PMID: 19054114

Eaves97: Eaves DJ, Palmer T, Boxer DH (1997). "The product of the molybdenum cofactor gene mobB of Escherichia coli is a GTP-binding protein." Eur J Biochem 246(3);690-7. PMID: 9219527

Gerdes03: Gerdes SY, Scholle MD, Campbell JW, Balazsi G, Ravasz E, Daugherty MD, Somera AL, Kyrpides NC, Anderson I, Gelfand MS, Bhattacharya A, Kapatral V, D'Souza M, Baev MV, Grechkin Y, Mseeh F, Fonstein MY, Overbeek R, Barabasi AL, Oltvai ZN, Osterman AL (2003). "Experimental determination and system level analysis of essential genes in Escherichia coli MG1655." J Bacteriol 185(19);5673-84. PMID: 13129938

GOA01a: GOA, DDB, FB, MGI, ZFIN (2001). "Gene Ontology annotation through association of InterPro records with GO terms."

IobbiNivol95: Iobbi-Nivol C, Palmer T, Whitty PW, McNairn E, Boxer DH (1995). "The mob locus of Escherichia coli K12 required for molybdenum cofactor biosynthesis is expressed at very low levels." Microbiology 1995;141 ( Pt 7);1663-71. PMID: 7551035

Joyce06: Joyce AR, Reed JL, White A, Edwards R, Osterman A, Baba T, Mori H, Lesely SA, Palsson BO, Agarwalla S (2006). "Experimental and computational assessment of conditionally essential genes in Escherichia coli." J Bacteriol 188(23);8259-71. PMID: 17012394

Magalon02: Magalon A, Frixon C, Pommier J, Giordano G, Blasco F (2002). "In vivo interactions between gene products involved in the final stages of molybdenum cofactor biosynthesis in Escherichia coli." J Biol Chem 277(50);48199-204. PMID: 12372836

McLuskey03: McLuskey K, Harrison JA, Schuttelkopf AW, Boxer DH, Hunter WN (2003). "Insight into the role of Escherichia coli MobB in molybdenum cofactor biosynthesis based on the high resolution crystal structure." J Biol Chem 278(26);23706-13. PMID: 12682065

Palmer96a: Palmer T, Santini CL, Iobbi-Nivol C, Eaves DJ, Boxer DH, Giordano G (1996). "Involvement of the narJ and mob gene products in distinct steps in the biosynthesis of the molybdoenzyme nitrate reductase in Escherichia coli." Mol Microbiol 1996;20(4);875-84. PMID: 8793883

Rangarajan03: Rangarajan SE, Tocilj A, Li Y, Iannuzzi P, Matte A, Cygler M (2003). "Molecules of Escherichia coli MobB assemble into densely packed hollow cylinders in a crystal lattice with 75% solvent content." Acta Crystallogr D Biol Crystallogr 59(Pt 12);2348-52. PMID: 14646116

Shanmugam92: Shanmugam KT, Stewart V, Gunsalus RP, Boxer DH, Cole JA, Chippaux M, DeMoss JA, Giordano G, Lin EC, Rajagopalan KV (1992). "Proposed nomenclature for the genes involved in molybdenum metabolism in Escherichia coli and Salmonella typhimurium." Mol Microbiol 6(22);3452-4. PMID: 1484496

UniProt09: UniProt Consortium (2009). "UniProt version 15.8 released on 2009-10-01 00:00:00." Database.

UniProt10a: UniProt Consortium (2010). "UniProt version 2010-07 released on 2010-06-15 00:00:00." Database.

UniProt12a: UniProt Consortium (2012). "UniProt version 2012-09 released on 2012-09-12 00:00:00." Database.

UniProtGOA11a: UniProt-GOA (2011). "Gene Ontology annotation based on manual assignment of UniProtKB keywords in UniProtKB/Swiss-Prot entries."

Vergnes04: Vergnes A, Gouffi-Belhabich K, Blasco F, Giordano G, Magalon A (2004). "Involvement of the molybdenum cofactor biosynthetic machinery in the maturation of the Escherichia coli nitrate reductase A." J Biol Chem 279(40);41398-403. PMID: 15247236

Other References Related to Gene Regulation

Salmon03: Salmon K, Hung SP, Mekjian K, Baldi P, Hatfield GW, Gunsalus RP (2003). "Global gene expression profiling in Escherichia coli K12. The effects of oxygen availability and FNR." J Biol Chem 278(32);29837-55. PMID: 12754220

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Please cite the following article in publications resulting from the use of EcoCyc: Nucleic Acids Research 41:D605-12 2013
Page generated by SRI International Pathway Tools version 19.0 on Tue Oct 6, 2015, biocyc14.