Sterner, Reinhard and Dahm, A. and Darimont, Beatrice and Ivens, Andreas and Liebl, W. and Kirschner, Kasper (1995) (Beta alpha)8-barrel proteins of tryptophan biosynthesis in the hyperthermophile Thermotoga maritima. The EMBO journal 14 (18), pp. 4395-402.
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To better understand the evolution of a key metabolic pathway, we have sequenced the trpCFBA gene cluster of the hyperthermophilic bacterium Thermotoga maritima. The genes were cloned by complementation in vivo of trp deletion strains of Escherichia coli. The new sequences, together with earlier findings, establish that the trp operon of T.maritima has the order trpE(G.D)CFBA, which might represent the ancestral organization of the tryptophan operon. Heterologous expression of the trp(G.D) and trpC genes in E.coli and N-terminal sequencing of their polypeptide products showed that their translation is initiated at the rate start codons TTG and ATC, respectively. Consequently, the N-terminus of the trp(G.D) fusion protein is 43 residues shorter than previously postulated. Amino acid composition and sequence analyses of the protein products of T.maritima trpC (indoleglycerol phosphate synthase), trpF (phosphoribosyl anthranilate isomerase) and trpA (alpha-subunit of tryptophan synthase) suggest that these thermostable (beta alpha)8-barrel proteins may be stabilized by additional salt bridges, compared with the mesostable forms. Another notable feature is the predicted lack of the N-terminal helix alpha 0 in the alpha-subunit of tryptophan synthase.
|Institutions:||Biology, Preclinical Medicine > Institut für Biophysik und physikalische Biochemie > Prof. Dr. Reinhard Sterner|
|Subjects:||500 Science > 570 Life sciences|
|Refereed:||Yes, this version has been refereed|
|Created at the University of Regensburg:||Yes|
|Deposited On:||22 Mar 2010 09:33|
|Last Modified:||22 Mar 2010 09:33|