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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Statistical potential ： ウィキペディア英語版 Statistical potential In protein structure prediction, a statistical potential or knowledge-based potential is an energy function derived from an analysis of known protein structures in the Protein Data Bank. Many methods exist to obtain such potentials; two notable methods are the ''quasi-chemical approximation'' (due to Miyazawa and Jernigan〔Miyazawa S, Jernigan R (1985) Estimation of effective interresidue contact energies from protein crystal structures: quasi-chemical approximation. Macromolecules 18: 534–552.〕) and the ''potential of mean force'' (due to Sippl 〔Sippl MJ (1990) Calculation of conformational ensembles from potentials of mean force. An approach to the knowledge-based prediction of local structures in globular proteins. J Mol Biol 213: 859–883.〕). Although the obtained energies are often considered as approximations of the free energy, this physical interpretation is incorrect.〔Thomas PD, Dill KA (1996) Statistical potentials extracted from protein structures: how accurate are they? J Mol Biol 257: 457–469.〕〔Ben-Naim A (1997) Statistical potentials extracted from protein structures: Are these meaningful potentials? J Chem Phys 107: 3698–3706.〕 Nonetheless, they have been applied with a limited success in many cases because they frequently correlate with actual (physical) free energy differences. ==Assigning an energy== Possible features to which an energy can be assigned include torsion angles (such as the $\backslash phi,\; \backslash psi$ angles of the Ramachandran plot), solvent exposure or hydrogen bond geometry. The classic application of such potentials is however pairwise amino acid contacts or distances. For pairwise amino acid contacts, a statistical potential is formulated as an interaction matrix that assigns a weight or energy value to each possible pair of standard amino acids. The energy of a particular structural model is then the combined energy of all pairwise contacts (defined as two amino acids within a certain distance of each other) in the structure. The energies are determined using statistics on amino acid contacts in a database of known protein structures (obtained from the Protein Data Bank). 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Statistical potential」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.