Abstract
Lipases/acyltransferases, such as CpLIP2 from Candida parapsilosis and CduLAc from Candida dubliniensis, catalyze acyl transfer preferentially over hydrolysis if a suitable nucleophile is present, even in a medium with a high thermodynamic activity of water (aW ). These enzymes are related to CAL-A from Moesziomyces antarcticus, which, in comparison, displays a lower acyl transfer ability. The 3D structures of wild types and mutants of CAL-A, CpLIP2, and CduLAc revealed differences in size and hydrophobicity of a large pocket located under the catalytic triad. The kinetic behavior of site-directed mutants confirmed the role of this pocket in competition between methanol and water as the nucleophile acceptor for the deacylation step. The mutations provided a better understanding of key structural determinants for variable levels of acyltransferase ability observed and supported the existence of a complex network of nucleophile interactions within the enzymes. The shape and size of the possible nucleophile pocket identified also suggested that multiple binding sites could exist, which supported the hypothesis of non-overlapping leaving and accepting nucleophile binding sites.
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 callMore From: Chembiochem : a European journal of chemical biology
Disclaimer: 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.
