Molecular and General Genetics MGG

, Volume 206, Issue 3, pp 401–407 | Cite as

Separate regulatory systems for the repression of metE and btuB by vitamin B12 in Escherichia coli

  • Michael D. Lundrigan
  • Linda C. DeVeaux
  • Barbara J. Mann
  • Robert J. Kadner


Synthesis of the btuB-encoded outer membrane receptor for vitamin B12 and the metE-encoded homocysteine methyltransferase is repressed by growth of Escherichia coli in the presence of vitamin B12. The regulation by vitamin B12 of the production of β-galactosidase in strains carrying btuB-lac or metE-lac operon fusions indicated that repression of both genes operates at the transcriptional level. Selection for expression of these fusions under repressive conditions allowed isolation of second-site mutations in which repressibility by vitamin B12 had been lost. Mutations in metH and metF prevented vitamin B12-dependent regulation of metE, but not that of btuB. Mutations in btuB and other genes involved in uptake of the vitamin eliminated or reduced repression. Mutations in the newly identified gene, btuR, controlled the repressibility of btuB, but had no effect on metE regulation. The btuR gene resides at 27.9 min on the genetic map in the gene order cysB-topA-btuR-trp; it acts in a trans-dominant manner and appears to encode a repressor of btuB transcription.

Key words

E. coli Vitamin B12 btuB Repression 


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Copyright information

© Springer-Verlag 1987

Authors and Affiliations

  • Michael D. Lundrigan
    • 1
    • 2
  • Linda C. DeVeaux
    • 1
    • 2
  • Barbara J. Mann
    • 1
    • 2
  • Robert J. Kadner
    • 1
    • 2
  1. 1.Department of Microbiology, School of MedicineUniversity of VirginiaCharlottesvilleUSA
  2. 2.the Molecular Biology Institute, School of MedicineUniversity of VirginiaCharlottesvilleUSA

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