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. 1987 May;169(5):2044–2049. doi: 10.1128/jb.169.5.2044-2049.1987

Ferric-coprogen receptor FhuE of Escherichia coli: processing and sequence common to all TonB-dependent outer membrane receptor proteins.

M Sauer, K Hantke, V Braun
PMCID: PMC212085  PMID: 3032906

Abstract

Iron transport via siderophores requires outer membrane receptor proteins and the TonB protein. The FhuE protein of Escherichia coli functions as the receptor for ferric coprogen and ferric-rhodotorulic acid. A chromosomal DNA fragment bearing the fhuE gene was cloned into pACYC184. The gene was localized by insertion mutagenesis by using the transposon Tn1000. Expression in minicells revealed a FhuE precursor with an apparent molecular weight of 82,000 and a FhuE protein with a molecular weight of 76,000. The transcription polarity of the fhuE gene was deduced from the size of truncated polypeptides derived from Tn1000 insertions, which were mapped by restriction analysis. The processing of truncated precursors that were synthesized by insertion mutants was strongly reduced even when the insertion site was close to the carboxy terminus of the FhuE protein. It is concluded that either the efficient insertion of proFhuE into the cytoplasmic membrane or the rate of cleavage of the signal peptide requires a particular conformation of the proFhuE protein, which is only formed by the complete primary structure. The amino-terminal amino acid sequence deduced from the nucleotide sequence was confirmed by gas-phase sequencing of the precursor and the mature form, which were separated by electrophoresis on polyacrylamide gels. The precursor contained an unusually long signal peptide of 36 amino acids. The amino-terminal end of the mature form contained the sequence Glu-Thr-Val Ile-Val. A pentapeptide starting with either Glu or Asp, followed by Thr, and two uncharged residues ending with Val were found in all outer membrane receptor proteins that were constituents of TonB-dependent transport systems.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

  1. Aebersold R. H., Teplow D. B., Hood L. E., Kent S. B. Electroblotting onto activated glass. High efficiency preparation of proteins from analytical sodium dodecyl sulfate-polyacrylamide gels for direct sequence analysis. J Biol Chem. 1986 Mar 25;261(9):4229–4238. [PubMed] [Google Scholar]
  2. Ansorge W., Barker R. System for DNA sequencing with resolution of up to 600 base pairs. J Biochem Biophys Methods. 1984 Mar;9(1):33–47. doi: 10.1016/0165-022x(84)90064-2. [DOI] [PubMed] [Google Scholar]
  3. Bassford P. J., Jr, Bradbeer C., Kadner R. J., Schnaitman C. A. Transport of vitamin B12 in tonB mutants of Escherichia coli. J Bacteriol. 1976 Oct;128(1):242–247. doi: 10.1128/jb.128.1.242-247.1976. [DOI] [PMC free article] [PubMed] [Google Scholar]
  4. Biggin M. D., Gibson T. J., Hong G. F. Buffer gradient gels and 35S label as an aid to rapid DNA sequence determination. Proc Natl Acad Sci U S A. 1983 Jul;80(13):3963–3965. doi: 10.1073/pnas.80.13.3963. [DOI] [PMC free article] [PubMed] [Google Scholar]
  5. Birnboim H. C. A rapid alkaline extraction method for the isolation of plasmid DNA. Methods Enzymol. 1983;100:243–255. doi: 10.1016/0076-6879(83)00059-2. [DOI] [PubMed] [Google Scholar]
  6. Braun V., Frenz J., Hantke K., Schaller K. Penetration of colicin M into cells of Escherichia coli. J Bacteriol. 1980 Apr;142(1):162–168. doi: 10.1128/jb.142.1.162-168.1980. [DOI] [PMC free article] [PubMed] [Google Scholar]
  7. Bremer E., Silhavy T. J., Weinstock G. M. Transposable lambda placMu bacteriophages for creating lacZ operon fusions and kanamycin resistance insertions in Escherichia coli. J Bacteriol. 1985 Jun;162(3):1092–1099. doi: 10.1128/jb.162.3.1092-1099.1985. [DOI] [PMC free article] [PubMed] [Google Scholar]
  8. Coulton J. W., Mason P., Cameron D. R., Carmel G., Jean R., Rode H. N. Protein fusions of beta-galactosidase to the ferrichrome-iron receptor of Escherichia coli K-12. J Bacteriol. 1986 Jan;165(1):181–192. doi: 10.1128/jb.165.1.181-192.1986. [DOI] [PMC free article] [PubMed] [Google Scholar]
  9. Dougan G., Sherratt D. The transposon Tn1 as a probe for studying ColE1 structure and function. Mol Gen Genet. 1977 Mar 7;151(2):151–160. doi: 10.1007/BF00338689. [DOI] [PubMed] [Google Scholar]
  10. Frost G. E., Rosenberg H. Relationship between the tonB locus and iron transport in Escherichia coli. J Bacteriol. 1975 Nov;124(2):704–712. doi: 10.1128/jb.124.2.704-712.1975. [DOI] [PMC free article] [PubMed] [Google Scholar]
  11. Guyer M. S. Uses of the transposon gamma delta in the analysis of cloned genes. Methods Enzymol. 1983;101:362–369. doi: 10.1016/0076-6879(83)01027-7. [DOI] [PubMed] [Google Scholar]
  12. Hancock R. E., Hantke K., Braun V. Iron transport in Escherichia coli K-12. 2,3-Dihydroxybenzoate-promoted iron uptake. Arch Microbiol. 1977 Sep 28;114(3):231–239. doi: 10.1007/BF00446867. [DOI] [PubMed] [Google Scholar]
  13. Hancock R. W., Braun V. Nature of the energy requirement for the irreversible adsorption of bacteriophages T1 and phi80 to Escherichia coli. J Bacteriol. 1976 Feb;125(2):409–415. doi: 10.1128/jb.125.2.409-415.1976. [DOI] [PMC free article] [PubMed] [Google Scholar]
  14. Hantke K., Braun V. Functional interaction of the tonA/tonB receptor system in Escherichia coli. J Bacteriol. 1978 Jul;135(1):190–197. doi: 10.1128/jb.135.1.190-197.1978. [DOI] [PMC free article] [PubMed] [Google Scholar]
  15. Hantke K. Identification of an iron uptake system specific for coprogen and rhodotorulic acid in Escherichia coli K12. Mol Gen Genet. 1983;191(2):301–306. doi: 10.1007/BF00334830. [DOI] [PubMed] [Google Scholar]
  16. Hantke K. Regulation of ferric iron transport in Escherichia coli K12: isolation of a constitutive mutant. Mol Gen Genet. 1981;182(2):288–292. doi: 10.1007/BF00269672. [DOI] [PubMed] [Google Scholar]
  17. Heller K., Kadner R. J. Nucleotide sequence of the gene for the vitamin B12 receptor protein in the outer membrane of Escherichia coli. J Bacteriol. 1985 Mar;161(3):904–908. doi: 10.1128/jb.161.3.904-908.1985. [DOI] [PMC free article] [PubMed] [Google Scholar]
  18. Lugtenberg B., Meijers J., Peters R., van der Hoek P., van Alphen L. Electrophoretic resolution of the "major outer membrane protein" of Escherichia coli K12 into four bands. FEBS Lett. 1975 Oct 15;58(1):254–258. doi: 10.1016/0014-5793(75)80272-9. [DOI] [PubMed] [Google Scholar]
  19. Lundrigan M. D., Kadner R. J. Nucleotide sequence of the gene for the ferrienterochelin receptor FepA in Escherichia coli. Homology among outer membrane receptors that interact with TonB. J Biol Chem. 1986 Aug 15;261(23):10797–10801. [PubMed] [Google Scholar]
  20. Neilands J. B. Microbial iron compounds. Annu Rev Biochem. 1981;50:715–731. doi: 10.1146/annurev.bi.50.070181.003435. [DOI] [PubMed] [Google Scholar]
  21. Palva E. T., Hirst T. R., Hardy S. J., Holmgren J., Randall L. Synthesis of a precursor to the B subunit of heat-labile enterotoxin in Escherichia coli. J Bacteriol. 1981 Apr;146(1):325–330. doi: 10.1128/jb.146.1.325-330.1981. [DOI] [PMC free article] [PubMed] [Google Scholar]
  22. Plastow G. S., Holland I. B. Identification of an Escherichia coli inner membrane polypeptide specified by a lambda-tonB transducing. Biochem Biophys Res Commun. 1979 Oct 12;90(3):1007–1014. doi: 10.1016/0006-291x(79)91927-2. [DOI] [PubMed] [Google Scholar]
  23. Postle K., Good R. F. DNA sequence of the Escherichia coli tonB gene. Proc Natl Acad Sci U S A. 1983 Sep;80(17):5235–5239. doi: 10.1073/pnas.80.17.5235. [DOI] [PMC free article] [PubMed] [Google Scholar]
  24. Postle K., Reznikoff W. S. Identification of the Escherichia coli tonB gene product in minicells containing tonB hybrid plasmids. J Mol Biol. 1979 Jul 5;131(3):619–636. doi: 10.1016/0022-2836(79)90011-1. [DOI] [PubMed] [Google Scholar]
  25. Pugsley A. P., Reeves P. Characterization of group B colicin-resistant mutants of Escherichia coli K-12: colicin resistance and the role of enterochelin. J Bacteriol. 1976 Jul;127(1):218–228. doi: 10.1128/jb.127.1.218-228.1976. [DOI] [PMC free article] [PubMed] [Google Scholar]
  26. Reynolds P. R., Mottur G. P., Bradbeer C. Transport of vitamin B12 in Escherichia coli. Some observations on the roles of the gene products of BtuC and TonB. J Biol Chem. 1980 May 10;255(9):4313–4319. [PubMed] [Google Scholar]
  27. Sanger F., Coulson A. R., Barrell B. G., Smith A. J., Roe B. A. Cloning in single-stranded bacteriophage as an aid to rapid DNA sequencing. J Mol Biol. 1980 Oct 25;143(2):161–178. doi: 10.1016/0022-2836(80)90196-5. [DOI] [PubMed] [Google Scholar]
  28. Tabor S., Richardson C. C. A bacteriophage T7 RNA polymerase/promoter system for controlled exclusive expression of specific genes. Proc Natl Acad Sci U S A. 1985 Feb;82(4):1074–1078. doi: 10.1073/pnas.82.4.1074. [DOI] [PMC free article] [PubMed] [Google Scholar]
  29. Weaver C. A., Konisky J. tonB-independent ferrichrome-mediated iron transport in Escherichia coli spheroplasts. J Bacteriol. 1980 Sep;143(3):1513–1518. doi: 10.1128/jb.143.3.1513-1518.1980. [DOI] [PMC free article] [PubMed] [Google Scholar]
  30. Yanisch-Perron C., Vieira J., Messing J. Improved M13 phage cloning vectors and host strains: nucleotide sequences of the M13mp18 and pUC19 vectors. Gene. 1985;33(1):103–119. doi: 10.1016/0378-1119(85)90120-9. [DOI] [PubMed] [Google Scholar]
  31. von Heijne G. Signal sequences. The limits of variation. J Mol Biol. 1985 Jul 5;184(1):99–105. doi: 10.1016/0022-2836(85)90046-4. [DOI] [PubMed] [Google Scholar]

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