ASSESSMENT OF A PROTEIN FOLD RECOGNITION METHOD THAT TAKES INTO ACCOUNT 4 PHYSICOCHEMICAL PROPERTIES - SIDE-CHAIN PACKING, SOLVATION, HYDROGEN-BONDING, AND LOCAL CONFORMATION

A protein fold recognition method was tested by the blind prediction of the structures of a set of proteins. The method evaluates the compatibility of an amino acid sequence with a three-dimensional structure using the four evaluation functions: side-chain packing, solvation, hydrogen-bonding, and local conformation functions. The structures of 14 proteins containing 19 sequences were predicted, The predictions were compared with the experimental structures. The experimental results showed that 9 of the 19 target sequences have known folds or portions of known folds. Among them, the folds of Klebsiella aerogenes urease beta subunit (KAUB) and pyruvate phosphate dikinase domain 4 (PPDK4) were successfully recognized; our method predicted that KAUB and PPDK4 would adopt the folds of macromomycin (Ig-fold) and phosphoribosylanthranilate isomerase:indoleglycerol-phosphate synthase (TIM barrel), respectively, and the experimental structure revealed that they actually adopt the predicted folds, The predictions for the other targets were not successful, but they often gave secondary structural patterns similar to those of the experimental structures. (C) 1995 Wiley-Liss, Inc.