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Molecular Phylogenetic Analysis of Tryptophanyl-tRNA Synthetase of Actinobacillus actinomycetemcomitans

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Molecular Phylogenetic Analysis of Tryptophanyl-tRNA Synthetase of Actinobacillus actinomycetemcomitans

Narayanan Rajendran

a,

*, Rajendram V. Rajnarayanan

b

, and Donald R. Demuth

c

a Biology, MASC, Kentucky State University, Frankfort, KY-40601, USA.

Fax: (5 02) 5 97Ð68 26. E-mail: narayanan.rajendran@kysu.edu

b Chemistry, NSD, Tougaloo College, Tougaloo, MS-39174, USA

c Center for Oral Health and Systemic DiseaseÐSchool of Dentistry, University of Louisville, Louisville, KY-40292, USA

* Author for correspondence and reprint requests

Z. Naturforsch.63 c, 418Ð428 (2008); received November 8, 2007/January 7, 2008

Aminoacyl-tRNA synthetase family enzymes are of particular interest for creating univer- sal phylogenetic trees and understanding the gene flow as these enzymes perform the basic and analogous biochemical function of protein synthesis in all extant organisms. Among them, tryptophanyl-tRNA synthetase (Trp-RS) plays a foremost role in phylogeny owing to the close relationship with tyrosine-tRNA synthetase. In this study, the sequence of the gene Trp-RSwas amplified using degenerated adenylation domain primers in the periodontal bac- terium Actinobacillus actinomycetemcomitans. The sequence of the cloned PCR amplicon confirmed the adenylation domain sequence with glutamic acid residue, which is absent in five other oral bacteria used in this study as well as in a number of other bacteria described in the database. The Trp-RS sequence analysis prevailed the identify elements such as Ross- mann-fold sequence and tRNATrpbinding domains including acceptor stem and anticodon.

A theoretical model of Trp-RS ofA. actinomycetemcomitanswas generated. Guided docking of the ligand tryptophanyl-5⬘-AMP revealed a highly identical active site in comparison with the bacterial template. The phylogenetic positioning of Trp-RS among a group of oral bac- terial species revealed thatA. actinomycetemcomitansis closely related toHaemophilus influ- enzae,H. ducreyiandPasteurella multocida.

Key words:Aminoacyl-tRNA Synthetase (AARS), Tryptophanyl-tRNA Synthetase (Trp-RS), Actinobacillus actinomycetemcomitans, Phylogenetic Tree

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