Abstract

AbstractFunctional characterization of a protein sequence is one of the most frequent problems in biology. This task is usually facilitated by accurate three‐dimensional (3‐D) structure of the studied protein. In the absence of an experimentally determined structure, comparative or homology modeling can sometimes provide a useful 3‐D model for a protein that is related to at least one known protein structure. Comparative modeling predicts the 3‐D structure of a given protein sequence (target) based primarily on its alignment to one or more proteins of known structure (templates). The prediction process consists of fold assignment, target‐template alignment, model building, and model evaluation. This unit describes generic considerations in all four steps of comparative modeling, typical modeling errors, and applications of comparative protein structure models. Finally, it illustrates these considerations in practice by discussing in detail one application of our program MODELLER.

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