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In Silico Biology 10, 0015 (2010); ©2009, Bioinformation Systems e.V.  

POODLE-I: Disordered region prediction by integrating POODLE series and structural information predictors based on a workflow approach

Shuichi Hirose*, Kana Shimizu and Tamotsu Noguchi

Computational Biology Research Center (CBRC), National Institute of Advanced Industrial Science and Technology (AIST), 2-43 Aomi, Koto-ku, Tokyo, Japan

* Corresponding author

Edited by E. Wingender; received May 01, 2009; revised and accepted April 05, 2010; published April 10, 2010


Under physiological conditions, many proteins that include a region lacking well-defined three-dimensional structures have been identified, especially in eukaryotes. These regions often play an important biological cellular role, although they cannot form a stable structure. Therefore, they are biologically remarkable phenomena. From an industrial perspective, they can provide useful information for determining three-dimensional structures or designing drugs. For these reasons, disordered regions have attracted a great deal of attention in recent years. Their accurate prediction is therefore anticipated to provide annotations that are useful for wide range of applications.

POODLE-I (where "I" stands for integration) is a web-based disordered region prediction system. POODLE-I integrates prediction results obtained from three kinds of disordered region predictors (POODLEs) developed from the viewpoint that the characteristics of disordered regions change according to their length. Furthermore, POODLE-I combines that information with predicted structural information by application of a workflow approach. When compared with server teams that showed best performance in CASP8, POODLE-I ranked among the top and exhibited the highest performance in predicting unfolded proteins.

POODLE-I is an efficient tool for detecting disordered regions in proteins solely from the amino acid sequence. The application is freely available at

Keywords: disordered region, unfolded protein, workflow, secondary structure, accessible surface area, coiled coil, fold recognition, CASP