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Isolation and characterization of EstC, a new cold-active esterase from Streptomyces coelicolor A3(2)


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Brault, Guillaume; Shareck, Francois; Hurtubise, Yves; Lépine, Francois et Doucet, Nicolas ORCID logoORCID: https://orcid.org/0000-0002-1952-9380 (2012). Isolation and characterization of EstC, a new cold-active esterase from Streptomyces coelicolor A3(2) PLoS ONE , vol. 7 , nº 3:e32041. pp. 1-9. DOI: 10.1371/journal.pone.0032041.

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The genome sequence of Streptomyces coelicolor A3(2) contains more than 50 genes coding for putative lipolytic enzymes. Many studies have shown the capacity of this actinomycete to store important reserves of intracellular triacylglycerols in nutrient depletion situations. In the present study, we used genome mining of S. coelicolor to identify genes coding for putative, non-secreted esterases/lipases. Two genes were cloned and successfully overexpressed in E. coli as His-tagged fusion proteins. One of the recombinant enzymes, EstC, showed interesting cold-active esterase activity with a strong potential for the production of valuable esters. The purified enzyme displayed optimal activity at 35 degrees C and was cold-active with retention of 25% relative activity at 10 degrees C. Its optimal pH was 8.5-9 but the enzyme kept more than 75% of its maximal activity between pH 7.5 and 10. EstC also showed remarkable tolerance over a wide range of pH values, retaining almost full residual activity between pH 6-11. The enzyme was active toward short-chain p-nitrophenyl esters (C2-C12), displaying optimal activity with the valerate (C5) ester (k(cat)/K(m) = 737+/-77 s(-1) mM(-1)). The enzyme was also very active toward short chain triglycerides such as triacetin (C2:0) and tributyrin (C4:0), in addition to showing good primary alcohol and organic solvent tolerance, suggesting it could function as an interesting candidate for organic synthesis of short-chain esters such as flavors.

Type de document: Article
Mots-clés libres: -
Centre: Centre INRS-Institut Armand Frappier
Date de dépôt: 04 mars 2024 16:45
Dernière modification: 04 mars 2024 16:45
URI: https://espace.inrs.ca/id/eprint/13992

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