title: Correspondence analysis of amino acid usage within the family Bacillaceae.
abstract: When the amino acid usage of all completely sequenced prokaryotes is studied by multivariate analysis (MVA), it is known that the genomic molar content of guanine plus cytosine (GC) and optimal growth temperature (Topt) have a dominant effect. Furthermore, these two factors are associated to the first two axes of different MVA, and thus, nearly independent among them. However, it was recently shown that for several Families of prokaryotes there are significant and positive correlations between GC and Topt. This trend is particularly clear within Bacillaceae, where there are species displaying a broad range of variations for these two factors. In this paper we report that (a) Topt and genomic GC are the main factors shaping amino acid usage but are not independent between them, (b) the usage of cysteine is the second source of variability, and finally (c) the global hydrophobicity of the encoded proteins of each species is the third main factor.
authors.affiliation: Laboratorio de Organización y Evolución del Genoma, Facultad de Ciencias, Iguá 4225, Montevideo 11400, Uruguay.
authors.forename: Hugo
authors.initials: H
authors.lastname: Naya
authors.forename: Alejandro
authors.initials: A
authors.lastname: Zavala
authors.forename: Héctor
authors.initials: H
authors.lastname: Romero
authors.forename: Helena
authors.initials: H
authors.lastname: Rodríguez-Maseda
authors.forename: Héctor
authors.initials: H
authors.lastname: Musto
mesh_terms: D000596:Amino Acids / Q000235:genetics* / Q000378:metabolism*; D001406:Bacillaceae / Q000145:classification / Q000235:genetics* / Q000378:metabolism*; D001482:Base Composition / Q000235:genetics; D019143:Evolution, Molecular; D005787:Gene Frequency; D016680:Genome, Bacterial; D015999:Multivariate Analysis; D020539:Sequence Analysis, Protein / Q000379:methods*; D017385:Sequence Homology; D013045:Species Specificity; D013696:Temperature
chemical_list: D000596:Amino Acids