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Título: Adaptative features of ectothermic enzymes. III. Studies on phospho-glucoisomerase (PGI) from five species of tropical fishes of the superorder Ostariophysi
Autor(es): Zulema Coppes Achaval
Maria Luíza Barcellos Schwantes
Arno Rudi Schwantes
Paulo Henrique de Luca
Adalberto Luis Val
Assunto: Evolução
ISSN: 1096-4959
Revista: Comparative Biochemistry and Physiology. Part B: Biochemistry & Molecular Biology
Volume: 72
Resumo: The electrokinetic and thermostability properties of phosphoglucose isomerase (PGI) in five species of tropical fish (Ostariophysi)—Leporinus friderici, L. silvestrii, Schizodon nasuttus, Hypostomus sp and Pimelodus maculatus—have been studied in order to study the adaptative nature of protein heterogeneity found in ectotherms. Unlike most diploid fishes, the PGI of these species seemed to be encoded by three, four or rive loci. The subunits encoded by these loci occurred at different levels in the different tissues and organs analyzed. Genetic variants at the three PGI loci were detected in two species of the family Anostomidae (L. friderici and S. nasuttus). In the family Pimelodidae, P. maculatus showed a genetic variant as the Pgi-1 locus. The product of these loci could be separated in three PGI regions based on their electrophoretic mobility, tissue distribution and thermostability properties. The more anodal region (including isozymes and allozymes) was more thermolabile than the less anodal one, which is predominant in a single tissue-skeletal muscle.
ISSN: 1096-4959
Aparece nas coleções:Coordenação de Biodiversidade (CBIO)

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