title: Composition Profiler: a tool for discovery and visualization of amino acid composition differences.
abstract: BACKGROUND
  Composition Profiler is a web-based tool for semi-automatic discovery of enrichment or depletion of amino acids, either individually or grouped by their physico-chemical or structural properties.
  
  
  RESULTS
  The program takes two samples of amino acids as input: a query sample and a reference sample. The latter provides a suitable background amino acid distribution, and should be chosen according to the nature of the query sample, for example, a standard protein database (e.g. SwissProt, PDB), a representative sample of proteins from the organism under study, or a group of proteins with a contrasting functional annotation. The results of the analysis of amino acid composition differences are summarized in textual and graphical form.
  
  
  CONCLUSIONS
  As an exploratory data mining tool, our software can be used to guide feature selection for protein function or structure predictors. For classes of proteins with significant differences in frequencies of amino acids having particular physico-chemical (e.g. hydrophobicity or charge) or structural (e.g. alpha helix propensity) properties, Composition Profiler can be used as a rough, light-weight visual classifier.
authors.affiliation: Department of Computer Science and Engineering, University of California, Riverside, CA 92521, USA. vladimir@cs.ucr.edu <vladimir@cs.ucr.edu>
authors.forename: Vladimir
authors.initials: V
authors.lastname: Vacic
authors.forename: Vladimir N
authors.initials: VN
authors.lastname: Uversky
authors.forename: A Keith
authors.initials: AK
authors.lastname: Dunker
authors.forename: Stefano
authors.initials: S
authors.lastname: Lonardi
mesh_terms: D000465:Algorithms; D000595:Amino Acid Sequence; D003196:Computer Graphics; D008969:Molecular Sequence Data; D011506:Proteins / Q000737:chemistry*; D016415:Sequence Alignment / Q000379:methods*; D020539:Sequence Analysis, Protein / Q000379:methods*; D012984:Software; D014584:User-Computer Interface
chemical_list: D011506:Proteins