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Protein Engineering, Vol. 15, No. 12, 959-965, December 2002
© 2002 Oxford University Press

MASKER: improved solvent-excluded molecular surface area estimations using Boolean masks

Christopher Bystroff

Department of Biology, Rensselaer Polytechnic Institute, Troy, NY 12180, USA E-mail: bystrc{at}rpi.edu

A fast algorithm for computing the solvent-accessible molecular surface area (SAS) using Boolean masks [Le Grand,S.M. and Merz,K.M.J. (1993). J. Comput. Chem., 14, 349–352) has been modified to estimate the solvent-excluded molecular surface area (SES), including contact, toroidal and re-entrant surface components. Numerical estimates of arc lengths of intersecting atomic SAS are used to estimate the toroidal surface and intersections between those arcs are used to estimate the re-entrant surface area. The new method is compared with an exact analytical method. Boolean molecular surface areas are continuous and pairwise differentiable and should be useful for molecular dynamics simulations, especially as the basis for an implicit solvent model.


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