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. 1991 Dec;173(24):7765–7771. doi: 10.1128/jb.173.24.7765-7771.1991

Mapping, sequence, and apparent lack of function of araJ, a gene of the Escherichia coli arabinose regulon.

T Reeder 1, R Schleif 1
PMCID: PMC212566  PMID: 1744033

Abstract

We report the mapping, sequencing, and study of the physiological role of the fourth arabinose-inducible operon from Escherichia coli, araJ. It is located at 9 min on the chromosome and codes for a single 42-kDa protein that shows no significant homology to other known proteins. Destruction of the chromosomal araJ gene does not detectably affect either of the two arabinose transport systems, the ability of cells to grow on arabinose, or the induction kinetics of the araBAD operon, and thus the physiological role of AraJ, if any, remains unknown. We have also found a long open reading frame upstream of araJ. The sequence of this upstream open reading frame was found to be identical to the previously reported sequence of the sbcC gene (I. S. Naom, S. J. Morton, D. R. F. Leach, and R. G. Lloyd, Nucleic Acids Res. 17:8033-8044, 1989). The carboxyl region of SbcC has an amino acid sequence consistent with this region of SbcC forming an extended alpha-helical coiled-coil.

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Selected References

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