Bioinformatics Vol. 18 no. 4 2002
Pages 617-625
© 2002 Oxford University Press
An HMM model for coiled-coil domains and a comparison with PSSM-based predictions
Genetics and Bioinformatics Division, The Walter and Eliza Hall Institute of Medical Research, Melbourne, Victoria 3050, Australia
Received on June 18, 2001
; revised on October 17, 2001
; accepted on November 15, 2001
Motivation: Large-scale sequence data require methods for the automated annotation of protein domains. Many of the predictive methods are based either on a Position Specific Scoring Matrix (PSSM) of fixed length or on a window-less Hidden Markov Model (HMM). The performance of the two approaches is tested for Coiled-Coil Domains (CCDs). The prediction of CCDs is used frequently, and its optimization seems worthwhile.
Results: We have conceived MARCOIL, an HMM for the recognition of proteins with a CCD on a genomic scale. A cross-validated study suggests that MARCOIL improves predictions compared to the traditional PSSM algorithm, especially for some protein families and for short CCDs. The study was designed to reveal differences inherent in the two methods. Potential confounding factors such as differences in the dimension of parameter space and in the parameter values were avoided by using the same amino acid propensities and by keeping the transition probabilities of the HMM constant during cross-validation.
Availability: The prediction program and the databases are available at http://www.wehi.edu.au/bioweb/Mauro/Marcoil
Contact: delorenzi{at}wehi.edu.au
* To whom correspondence should be addressed.
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