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Some measures of comparative performance in the three CASPs
C Venclovas1, A Zemla, K Fidelis
1Biology and Biotechnology Research Program, Lawrence Livermore National Laboratory, California, USA.
Proteins
|October 20, 1999
Summary
Protein structure prediction accuracy improved from CASP1 to CASP3 for homology models and ab initio methods. However, improvements between CASP2 and CASP3 were not apparent for homology models.
Area of Science:
- Computational Biology
- Structural Biology
- Bioinformatics
Background:
- The Critical Assessment of protein Structure Prediction (CASP) experiments evaluate protein structure prediction methods.
- Homology modeling and ab initio methods are two primary approaches to protein structure prediction.
Purpose of the Study:
- To compare the performance of protein structure prediction methods across CASP1, CASP2, and CASP3.
- To assess improvements in alignment accuracy for homology-based models and 3D accuracy for ab initio models.
Main Methods:
- Performance analysis of homologous models (comparative modeling and fold-recognition) and ab initio models.
- CASP targets were categorized by difficulty based on sequence identity and structural overlap with templates.
Main Results:
- Alignment accuracy for homology models showed clear improvement from CASP1 to CASP2 and CASP3, but no significant change between CASP2 and CASP3.
- The accuracy of the best ab initio models for small targets notably increased in CASP3 compared to CASP1 and CASP2.
Conclusions:
- While progress has been made in protein structure prediction, particularly with ab initio methods for small targets, further advancements are needed.
- The CASP experiments provide valuable benchmarks for tracking progress and identifying areas for improvement in computational protein structure prediction.