Protein TonB

NameProtein TonB
Synonyms
  • exbA
Gene NametonB
OrganismEscherichia coli (strain K12)
Amino acid sequence
>lcl|BSEQ0007686|Protein TonB
MTLDLPRRFPWPTLLSVCIHGAVVAGLLYTSVHQVIELPAPAQPISVTMVTPADLEPPQA
VQPPPEPVVEPEPEPEPIPEPPKEAPVVIEKPKPKPKPKPKPVKKVQEQPKRDVKPVESR
PASPFENTAPARLTSSTATAATSKPVTSVASGPRALSRNQPQYPARAQALRIEGQVKVKF
DVTPDGRVDNVQILSAKPANMFEREVKNAMRRWRYEPGKPGSGIVVNILFKINGTTEIQ
Number of residuesNone
Molecular Weight26094.07
Theoretical pI10.28
GO Classification
Functions
  • siderophore transmembrane transporter activity
  • energy transducer activity
Processes
  • protein transport
  • siderophore transport
  • cobalamin transport
  • colicin transport
Components
  • plasma membrane
  • integral component of membrane
  • intrinsic component of external side of plasma membrane
  • outer membrane-bounded periplasmic space
General FunctionSiderophore transmembrane transporter activity
Specific FunctionInteracts with outer membrane receptor proteins that carry out high-affinity binding and energy dependent uptake into the periplasmic space of specific substrates such as cobalamin, and various iron compounds (such as iron dicitrate, enterochelin, aerobactin, etc.). In the absence of TonB these receptors bind their substrates but do not carry out active transport. TonB also interacts with some colicins and is involved in the energy-dependent, irreversible steps of bacteriophages phi 80 and T1 infection. It could act to transduce energy from the cytoplasmic membrane to specific energy-requiring processes in the outer membrane, resulting in the release into the periplasm of ligands bound by these outer membrane proteins. Implicated in hydroxy radical-mediated cell death induced by hydroxyurea treatment (PubMed:20005847).
Transmembrane Regions1-32
GenBank Protein ID
UniProtKB IDP02929
UniProtKB Entry Name
Cellular LocationCell inner membrane
Gene sequence
>lcl|BSEQ0021696|Protein TonB (tonB)
ATGACCCTTGATTTACCTCGCCGCTTCCCCTGGCCGACGTTACTTTCGGTCTGCATTCAT
GGTGCTGTTGTGGCGGGTCTGCTCTATACCTCGGTACATCAGGTTATTGAACTACCTGCG
CCTGCGCAGCCGATTTCTGTCACGATGGTTACGCCTGCTGATCTCGAACCGCCACAAGCC
GTTCAGCCGCCACCGGAGCCGGTGGTAGAGCCAGAACCGGAACCTGAGCCGATCCCCGAA
CCGCCAAAAGAAGCACCGGTGGTCATTGAAAAGCCGAAGCCGAAACCTAAGCCAAAACCG
AAGCCGGTGAAAAAGGTACAGGAGCAGCCAAAACGCGATGTCAAACCCGTAGAGTCGCGT
CCGGCATCACCGTTTGAAAATACGGCACCGGCACGCCTGACATCAAGTACAGCAACGGCT
GCAACCAGCAAGCCGGTTACCAGTGTGGCTTCAGGACCACGCGCATTAAGCCGTAATCAG
CCGCAGTATCCGGCACGAGCACAGGCATTGCGCATTGAAGGGCAGGTTAAAGTTAAATTT
GACGTTACGCCGGATGGTCGCGTGGATAACGTACAAATCCTCTCAGCCAAGCCTGCGAAC
ATGTTTGAGCGTGAGGTGAAAAATGCGATGCGCAGATGGCGTTATGAGCCGGGTAAGCCA
GGCAGTGGGATTGTGGTGAATATCCTGTTTAAAATTAACGGCACCACCGAAATTCAGTAA
GenBank Gene ID
GeneCard IDNone
GenAtlas ID
HGNC ID
Chromosome LocationNone
LocusNone
References
  1. Postle K, Good RF: DNA sequence of the Escherichia coli tonB gene. Proc Natl Acad Sci U S A. 1983 Sep;80(17):5235-9. [6310567 ]
  2. Aiba H, Baba T, Hayashi K, Inada T, Isono K, Itoh T, Kasai H, Kashimoto K, Kimura S, Kitakawa M, Kitagawa M, Makino K, Miki T, Mizobuchi K, Mori H, Mori T, Motomura K, Nakade S, Nakamura Y, Nashimoto H, Nishio Y, Oshima T, Saito N, Sampei G, Horiuchi T, et al.: A 570-kb DNA sequence of the Escherichia coli K-12 genome corresponding to the 28.0-40.1 min region on the linkage map. DNA Res. 1996 Dec 31;3(6):363-77. [9097039 ]
  3. Blattner FR, Plunkett G 3rd, Bloch CA, Perna NT, Burland V, Riley M, Collado-Vides J, Glasner JD, Rode CK, Mayhew GF, Gregor J, Davis NW, Kirkpatrick HA, Goeden MA, Rose DJ, Mau B, Shao Y: The complete genome sequence of Escherichia coli K-12. Science. 1997 Sep 5;277(5331):1453-62. [9278503 ]
  4. Hayashi K, Morooka N, Yamamoto Y, Fujita K, Isono K, Choi S, Ohtsubo E, Baba T, Wanner BL, Mori H, Horiuchi T: Highly accurate genome sequences of Escherichia coli K-12 strains MG1655 and W3110. Mol Syst Biol. 2006;2:2006.0007. Epub 2006 Feb 21. [16738553 ]
  5. Roof SK, Allard JD, Bertrand KP, Postle K: Analysis of Escherichia coli TonB membrane topology by use of PhoA fusions. J Bacteriol. 1991 Sep;173(17):5554-7. [1885532 ]
  6. Karlsson M, Hannavy K, Higgins CF: A sequence-specific function for the N-terminal signal-like sequence of the TonB protein. Mol Microbiol. 1993 Apr;8(2):379-88. [8316087 ]
  7. Davies BW, Kohanski MA, Simmons LA, Winkler JA, Collins JJ, Walker GC: Hydroxyurea induces hydroxyl radical-mediated cell death in Escherichia coli. Mol Cell. 2009 Dec 11;36(5):845-60. doi: 10.1016/j.molcel.2009.11.024. [20005847 ]
  8. Chang C, Mooser A, Pluckthun A, Wlodawer A: Crystal structure of the dimeric C-terminal domain of TonB reveals a novel fold. J Biol Chem. 2001 Jul 20;276(29):27535-40. Epub 2001 Apr 27. [11328822 ]

From www.t3db.ca