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. 1995 Jul;177(14):4043–4052. doi: 10.1128/jb.177.14.4043-4052.1995

Molecular analysis of treB encoding the Escherichia coli enzyme II specific for trehalose.

W Klein 1, R Horlacher 1, W Boos 1
PMCID: PMC177135  PMID: 7608078

Abstract

A gene bank of partially Sau3A-digested Escherichia coli DNA ligated in plasmid pBR322 was screened for the ability to complement a mutant unable to metabolize trehalose at low osmolarity. The resulting plasmid was shown to contain the genes encoding transport (treB) and metabolic (treC) functions. The complementing DNA region was sequenced and shown to contain an operon of two genes, with treB as the promoter proximal gene and with treC as the promoter distal gene. The transcriptional start point was determined, and one major transcript was detected. The control region of the operon was found to contain consensus binding motifs for the cyclic AMP-catabolite activator protein complex and for a specific repressor protein whose gene, treR, is located immediately upstream of treB, being transcribed in the same direction as treB treC. The products of both genes could be expressed in minicells in which TreB revealed itself as a protein with an apparent molecular weight of 42,000. The gene product of treB consists of 485 amino acids with a calculated molecular weight of 52,308. It showed high homology to enzymes IIScr of enteric bacteria specific for the uptake of sucrose and encoded by plasmid pUR400 of enteric bacteria. Like enzyme IIScr, enzyme IITre belongs to the EIIBC domain type and lacks a covalently bound EIIA domain. Instead, enzyme IITre-mediated phosphorylation of trehalose requires the activity of enzyme IIAGlc, a component of the major glucose transport system.

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Selected References

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