Authors: Yang, Soo I.; Tanaka, Takuji

Source: FEBS Journal, Volume 275, Number 2, January 2008 , pp. 271-280(10)

Publisher: Wiley-Blackwell

Abstract:

The Lactococcus lactis NRRL B-1821 prolidase gene was cloned and overexpressed in Escherichia coli. Under suboptimum growth conditions, recombinant soluble and active prolidase was produced; in contrast, inclusion bodies were formed under conditions preferred for cell growth. Recombinant prolidase retained more than half its full activity between 30 and 60 °C, and was completely inactivated after 30 min at 70 °C. CD analysis confirmed that prolidase was inactivated at 67 °C. The enzyme was active under weak alkali to weak acidic conditions, and showed maximum activity at pH 7.0. Although these characteristics are similar to those for other reported prolidases, this prolidase was distinctive for two kinetic characteristics. Firstly, different substrate specificity was observed for its two preferred metal cations, zinc and manganese: Leu-Pro was preferred with zinc, whereas Arg-Pro was preferred with manganese. Secondly, the enzyme showed an allosteric response to changes in substrate concentrations, with Hill constants of 1.53 for Leu-Pro and 1.57 for Arg-Pro. Molecular modeling of this prolidase suggests that these unique characteristics may be attributed to a loop structure near the active site.

Keywords: bitterness; metallopeptidase; overexpression; PepQ; proline

Document Type: Research article

DOI: http://dx.doi.org/10.1111/j.1742-4658.2007.06197.x

Publication date: 2008-01-01

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• In this Subject: Anatomy & Physiology ,  Biology ,  Chemistry (General) ,  Biochemistry
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