Abstract
We purified a carboxypeptidase (CPY) from the yeast of Kluyveromyces marxianus. This enzyme was purified 170 times from a soluble extract of 100 000× g. Purification consisted in a fractionated precipitation with ammonium sulfate and two chromatographic steps consisting of anion exchange chromatography and hydrophobic interactions chromatography. The native enzyme depicted a molecular mass of 67 kDa by gel filtration. This serine carboxypeptidase depicted an optimal pH of 8.5 and was stable at a pH ranging from 6.0 to 9.0, its optimal temperature was of 45 °C and was unstable at temperatures above 55 °C; Michaelis constant and Vmax for N-benzoyl- l-tyrosine -p - nitroanilide were of 29 μM and 612 μM/min mg of protein, respectively. The enzyme was strongly inhibited by phenylmethylsufonyl fluoride (PMSF) and, to a lesser degree, by trans-epoxysuccinyl- l-leucylamido-(4-guanidine)-butane. This study indicated that K. marxianus carboxypeptidase could be an alternative to other animal-source carboxypeptidases in the industry.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
