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Combinatorial methods for small-molecule placement in computational enzyme design

Lassila, Jonathan Kyle and Privett, Heidi K. and Allen, Benjamin D. and Mayo, Stephen L. (2006) Combinatorial methods for small-molecule placement in computational enzyme design. Proceedings of the National Academy of Sciences of the United States of America, 103 (45). pp. 16710-16715. ISSN 0027-8424. http://resolver.caltech.edu/CaltechAUTHORS:LASpnas06

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Abstract

The incorporation of small-molecule transition state structures into protein design calculations poses special challenges because of the need to represent the added translational, rotational, and conformational freedoms within an already difficult optimization problem. Successful approaches to computational enzyme design have focused on catalytic side-chain contacts to guide placement of small molecules in active sites. We describe a process for modeling small molecules in enzyme design calculations that extends previously described methods, allowing favorable small-molecule positions and conformations to be explored simultaneously with sequence optimization. Because all current computational enzyme design methods rely heavily on sampling of possible active site geometries from discrete conformational states, we tested the effects of discretization parameters on calculation results. Rotational and translational step sizes as well as side-chain library types were varied in a series of computational tests designed to identify native-like binding contacts in three natural systems. We find that conformational parameters, especially the type of rotamer library used, significantly affect the ability of design calculations to recover native binding-site geometries. We describe the construction and use of a crystallographic conformer library and find that it more reliably captures active-site geometries than traditional rotamer libraries in the systems tested.


Item Type:Article
Additional Information:© 2006 by The National Academy of Sciences of the USA. Contributed by Stephen L. Mayo, September 16, 2006. Published online on October 30, 2006, 10.1073/pnas.0607691103. This work was supported by the Howard Hughes Medical Institute, the Ralph M. Parsons Foundation, the Defense Advanced Research Projects Agency, the U.S. Army Research Office Institute for Collaborative Biotechnologies, and an IBM Shared University Research Grant. Author contributions: J.K.L., H.K.P., B.D.A., and S.L.M. performed research; and J.K.L. wrote the paper. The authors declare no conflict of interest.
Subject Keywords:computational protein design; conformer library; enzyme catalysis; rotamer library
Record Number:CaltechAUTHORS:LASpnas06
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:LASpnas06
Alternative URL:http://dx.doi.org/10.1073/pnas.0607691103
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:9967
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:01 Apr 2008
Last Modified:14 Nov 2014 19:20

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