CASP9 target classification

被引:54
作者
Kinch, Lisa N. [1 ]
Shi, Shuoyong [2 ]
Cheng, Hua [2 ]
Cong, Qian [2 ]
Pei, Jimin [1 ]
Mariani, Valerio [3 ]
Schwede, Torsten [3 ]
Grishin, Nick V. [1 ,2 ]
机构
[1] Univ Texas SW Med Ctr Dallas, Howard Hughes Med Inst, Dallas, TX 75390 USA
[2] Univ Texas SW Med Ctr Dallas, Dept Biochem, Dallas, TX 75390 USA
[3] Univ Basel, Swiss Inst Bioinformat, Biozentrum, CH-4056 Basel, Switzerland
基金
美国国家卫生研究院;
关键词
protein structure; CASP9; classification; fold space; sequence homologs; structure analogs; free modeling; template based modeling; structure prediction; PROTEIN STRUCTURES; STRUCTURAL BASIS; DOMAIN; DATABASE; SERVER; SIMILARITIES; HOMOLOGY; PROSMOS;
D O I
10.1002/prot.23190
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
The Critical assessment of protein structure prediction round 9 (CASP9) aimed to evaluate predictions for 129 experimentally determined protein structures. To assess tertiary structure predictions, these target structures were divided into domain-based evaluation units that were then classified into two assessment categories: template based modeling (TBM) and template free modeling (FM). CASP9 targets were split into domains of structurally compact evolutionary modules. For the targets with more than one defined domain, the decision to split structures into domains for evaluation was based on server performance. Target domains were categorized based on their evolutionary relatedness to existing templates as well as their difficulty levels indicated by server performance. Those target domains with sequence-related templates and high server prediction performance were classified as TMB, whereas those targets without identifiable templates and low server performance were classified as FM. However, using these generalizations for classification resulted in a blurred boundary between CASP9 assessment categories. Thus, the FM category included those domains without sequence detectable templates (25 target domains) as well as some domains with difficult to detect templates whose predictions were as poor as those without templates (five target domains). Several interesting examples are discussed, including targets with sequence related templates that exhibit unusual structural differences, targets with homologous or analogous structure templates that are not detectable by sequence, and targets with new folds. Proteins 2011; 79(Suppl 10):21-36. (C) 2011 Wiley-Liss, Inc.
引用
收藏
页码:21 / 36
页数:16
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