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Comparative analysis of the cDNA encoding a ClpA homologue of Paracoccidioides brasiliensis

Published online by Cambridge University Press:  14 June 2005

Juliana CAMARGOS OLIVEIRA
Affiliation:
Laboratório de Biologia Molecular, ICB, Universidade Federal de Goiás, 74.001-970, Goiânia, Goiás, Brazil. E-mail: celia@icb.ufg.br
Nadya DA SILVA CASTRO
Affiliation:
Laboratório de Biologia Molecular, ICB, Universidade Federal de Goiás, 74.001-970, Goiânia, Goiás, Brazil. E-mail: celia@icb.ufg.br
Maria Sueli SOARES FELIPE
Affiliation:
Universidade de Brasília, 70910-900, Brasília, DF, Brazil.
Maristela PEREIRA
Affiliation:
Laboratório de Biologia Molecular, ICB, Universidade Federal de Goiás, 74.001-970, Goiânia, Goiás, Brazil. E-mail: celia@icb.ufg.br
Célia Maria DE ALMEIDA SOARES
Affiliation:
Laboratório de Biologia Molecular, ICB, Universidade Federal de Goiás, 74.001-970, Goiânia, Goiás, Brazil. E-mail: celia@icb.ufg.br
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Abstract

A cDNA encoding a chaperone ClpA homologue of Paracoccidioides brasiliensis was isolated and characterized. The ClpA belongs to a group of ClpATPAses proteins, which are highly conserved, and include several heat inducible molecular chaperones. In this study, a 2879 bp cDNA designated as Pbclpa was obtained which encodes a predicted protein of 927 amino acids. Characteristic consensus motifs of the ClpATPases family are present. The PbClpA middle region was compared to other related ClpA and ClpB proteins from fungi and bacteria. Comparative analysis demonstrated in the middle region the presence of a heptad repeat sequence, characteristic of ClpBs from prokaryotes and fungi, which are absent in ClpAs from prokaryotes but were present in all described fungal ClpAs. Our comparative analysis reveals that one of the criteria typically used to distinguish the prokaryotic subfamilies ClpA and ClpB, the size of the middle sequence, may not be useful in fungi. Phylogenetic analyses were performed with the complete sequences of ClpAs from fungi and bacteria and with the middle regions of those ClpAs present at NCBI and Pfam databases. Our results indicated that both types of analysis can be useful as a tool in the determination of phylogenetic relationships.

Type
Research Article
Copyright
© The British Mycological Society 2005

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Comparative analysis of the cDNA encoding a ClpA homologue of Paracoccidioides brasiliensis
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