ProClaT, a new bioinformatics tool for in silico protein reclassification: case study of DraB, a protein coded from the draTGB operon in Azospirillum brasilense

BMC Bioinformatics

Research

Fábio de Oliveira Pedrosa¹  Elisa Terumi Rubel²  Roberto Tadeu Raittz²  Michelly Alves Coutinho Gehlen²  Nilson Antonio da Rocha Coimbra² 

[1] Department of Biochemistry and Molecular Biology, Federal University of Paraná, Curitiba, PR, Brazil;Av. Cel. Francisco H. dos Santos, s/n, Curitiba, Paraná, Brazil;Laboratory of Bioinformatics, Professional and Technological Education Sector, Federal University of Paraná, Curitiba, PR, Brazil;Rua Dr. Alcides Vieira Arcoverde 1225, Curitiba, Paraná, Brazil;

关键词: Biological nitrogen fixation;    Artificial neural networks;    Protein classification;    Nitrogenase;    Nitrogenase associated NifO protein;    Azospirillum brasilense;    draTGB;   

DOI  :  10.1186/s12859-016-1338-5

来源: Springer

【 摘 要 】

BackgroundAzopirillum brasilense is a plant-growth promoting nitrogen-fixing bacteria that is used as bio-fertilizer in agriculture. Since nitrogen fixation has a high-energy demand, the reduction of N2 to NH4+ by nitrogenase occurs only under limiting conditions of NH4+ and O2. Moreover, the synthesis and activity of nitrogenase is highly regulated to prevent energy waste. In A. brasilense nitrogenase activity is regulated by the products of draG and draT. The product of the draB gene, located downstream in the draTGB operon, may be involved in the regulation of nitrogenase activity by an, as yet, unknown mechanism.ResultsA deep in silico analysis of the product of draB was undertaken aiming at suggesting its possible function and involvement with DraT and DraG in the regulation of nitrogenase activity in A. brasilense. In this work, we present a new artificial intelligence strategy for protein classification, named ProClaT. The features used by the pattern recognition model were derived from the primary structure of the DraB homologous proteins, calculated by a ProClaT internal algorithm. ProClaT was applied to this case study and the results revealed that the A. brasilense draB gene codes for a protein highly similar to the nitrogenase associated NifO protein of Azotobacter vinelandii.ConclusionsThis tool allowed the reclassification of DraB/NifO homologous proteins, hypothetical, conserved hypothetical and those annotated as putative arsenate reductase, ArsC, as NifO-like. An analysis of co-occurrence of draB, draT, draG and of other nif genes was performed, suggesting the involvement of draB (nifO) in nitrogen fixation, however, without the definition of a specific function.

【 授权许可】

CC BY   
© The Author(s). 2016