Computational studies of essential dynamics of Pseudomonas cepacia lipase.

Abstract:

:In order to investigate the interfacial activation of a lipase from Pseudomonas cepacia (PcL), molecular dynamics (MD) simulations and essential dynamics (ED) analysis were performed in different solvent environments: vacuum and explicit water solvents. Starting from the active (open) structure of PcL, the essential dynamics analysis of the simulations revealed large correlated motions, which may be responsible for the activation of the enzyme. Fluctuations in the U1 (active-site lid) and U2 domains are found to be important in the activation of PcL. In contrast, the catalytic triad exhibits very little displacement. These results are consistent with the previous X-ray structural determination. A combined analysis of the trajectories showed some differences for the simulations in different solvent environments. It was found that the region around the helix alpha5 showed larger displacements in the water simulations. It can be concluded that the open structure of PcL becomes unstable in water solvents, leading to the closing of the so-called 'lid' region. The simulations and ED analysis on the closed structure of PgL provided additional information concerning the structural changes involved in the activation of the lipases. It was found that structural changes for PcL and PgL, which are responsible for the essential motions of the protein, showed contrasting behavior in the different solvent environments.

journal_name

J Biomol Struct Dyn

authors

Lee J,Suh SW,Shin S

doi

10.1080/07391102.2000.10506667

subject

Has Abstract

pub_date

2000-10-01 00:00:00

pages

297-309

issue

2

eissn

0739-1102

issn

1538-0254

journal_volume

18

pub_type

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