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Patterns of molecular evolution in pathogenesis-related proteins
Scherer, Nicole M; Thompson, Claudia E; Freitas, Loreta B; Bonatto, Sandro L; Salzano, Francisco M.
  • Scherer, Nicole M; Universidade Federal do Rio Grande do Sul. Instituto de Biociências. Departamento de Genética. Porto Alegre. BR
  • Thompson, Claudia E; Universidade Federal do Rio Grande do Sul. Instituto de Biociências. Departamento de Genética. Porto Alegre. BR
  • Freitas, Loreta B; Universidade Federal do Rio Grande do Sul. Instituto de Biociências. Departamento de Genética. Porto Alegre. BR
  • Bonatto, Sandro L; Pontifícia Universidade Católica do Rio Grande do Sul. Faculdade de Biociências. Centro de Biologia Genômica e Molecular. Porto Alegre. BR
  • Salzano, Francisco M; Universidade Federal do Rio Grande do Sul. Instituto de Biociências. Departamento de Genética. Porto Alegre. BR
Genet. mol. biol ; 28(4): 645-653, Dec. 2005. tab
Article in English | LILACS | ID: lil-450987
ABSTRACT
The genes encoding 13 classes of pathogenesis-related (PR) proteins were examined for positive selection using maximum-likelihood (ML) models of codon substitution. The study involved 194 sequences from 54 species belonging to 37 genera. Although the sizes of the sequences examined varied from 237 bp for PR12 to 1,110 bp for PR7, most classes (9 out of 13) contained sequences made up of more than 400 nucleotides. Signs of positive selection were obtained for sites in PR proteins 4, 6, 8, 9 and 15 using an ML-based Bayesian method and likelihood ratio tests. These results confirm the importance of positive selection in proteins related to defense mechanisms already observed in a wide array of organisms
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Full text: Available Index: LILACS (Americas) Main subject: Plant Proteins / Evolution, Molecular Type of study: Etiology study Language: English Journal: Genet. mol. biol Journal subject: Genetics Year: 2005 Type: Article Affiliation country: Brazil Institution/Affiliation country: Pontifícia Universidade Católica do Rio Grande do Sul/BR / Universidade Federal do Rio Grande do Sul/BR

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Full text: Available Index: LILACS (Americas) Main subject: Plant Proteins / Evolution, Molecular Type of study: Etiology study Language: English Journal: Genet. mol. biol Journal subject: Genetics Year: 2005 Type: Article Affiliation country: Brazil Institution/Affiliation country: Pontifícia Universidade Católica do Rio Grande do Sul/BR / Universidade Federal do Rio Grande do Sul/BR