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Volume 148, Issue 8

The cold-inducible gene encoding thermolabile isocitrate lyase of a psychrophilic bacterium,

aThe GenBank accession number for the sequence reported in this paper is AB066287.

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Abstract

The gene encoding isocitrate lyase (ICL; EC 4.1.3.1) of a psychrophilic bacterium, , was cloned and sequenced. The ORF of the gene () was 1584 bp long, and the predicted gene product consisted of 528 aa (molecular mass 58150 Da) and showed low homology with the corresponding enzymes from other organisms. The analyses of amino acid content and primary structure of the ICL suggested that it possessed many features of a cold-adapted enzyme. Primer extension and Northern blot analyses revealed that two species of the mRNAs with differential lengths of 5′-untranslated regions (TS1 and TS2) were present, of which the 5′ end (TS1 and TS2 sites) were G and A, located at 130 and 39 bases upstream of the translation start codon, respectively. The levels of TS1 and TS2 mRNAs were increased by both acetate and low temperature. The induction of expression by low temperature took place in the cells grown on succinate as the carbon source but not acetate. Furthermore, a similar manner of inductions was also found in the levels of the translation and the enzyme activity in cell-free extract. These results suggest that the gene, encoding thermolabile isocitrate lyase, of is important for acetate utilization and cold adaptation.

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Keyword(s): cold-adapted enzyme , cold-inducible gene , ICL, isocitrate lyase , IDH, isocitrate dehydrogenase , isocitrate lyase , MS, malate synthase and psychrophilic bacterium
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2002-08-01
2024-04-26
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The cold-inducible icl gene encoding thermolabile isocitrate lyase of a psychrophilic bacterium, Colwellia marisaaThe GenBank accession number for the sequence reported in this paper is AB066287.
Microbiology 148, 2579 (2002); https://doi.org/10.1099/00221287-148-8-2579
/content/journal/micro/10.1099/00221287-148-8-2579
/content/journal/micro/10.1099/00221287-148-8-2579
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