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. 1990 May;172(5):2224–2229. doi: 10.1128/jb.172.5.2224-2229.1990

Sequence analysis of the hutH gene encoding histidine ammonia-lyase in Pseudomonas putida.

M W Consevage 1, A T Phillips 1
PMCID: PMC208851  PMID: 2332400

Abstract

The complete nucleotide sequence of the hutH gene, encoding histidine ammonia-lyase (histidase), in Pseudomonas putida ATCC 12633 has been determined from the appropriate portions of the hut region that had been cloned into Escherichia coli. The resulting DNA sequence revealed an open reading frame of 1,530 base pairs, corresponding to a protein subunit of approximate molecular weight 53,600, in the location previously identified for the histidase gene by Tn1000 mutagenesis. Translation began at a GTG codon, but direct protein sequencing revealed that the initiating amino acid was removed posttranslationally to provide an N-terminal threonine; 11 additional residues completely agreed with the predicted amino acid sequence. This sequence excluded the possibility that a dehydroalanine unit, the postulated coenzyme for histidase, is attached at the N terminus of histidase subunits. Comparison of the P. putida histidase gene sequence with that of a Bacillus subtilis region encoding histidase revealed 42% identity at the protein level. Although the hutU (urocanase) and hutH (histidase) genes are induced by urocanate and normally are transcribed as a unit beginning with hutU, analysis of the region immediately upstream of the histidase gene revealed a potential weak promoter that may possibly be used to maintain a basal level of histidase for the generation of inducer (urocanate) when histidine levels are elevated.

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Selected References

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