Aghaie A, Lechaplais C, Sirven P, Tricot S, Besnard-Gonnet M, Muselet D, de Berardinis V, Kreimeyer A, Gyapay G, Salanoubat M, Perret A. New insights into the alternative D-glucarate degradation pathway.
J Biol Chem 2008;
283:15638-46. [PMID:
18364348 DOI:
10.1074/jbc.m800487200]
[Citation(s) in RCA: 28] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Although the D-glucarate degradation pathway is well characterized in Escherichia coli, genetic and biochemical information concerning the alternative pathway proposed in Pseudomonas species and Bacillus subtilis remains incomplete. Acinetobacter baylyi ADP1 is a Gram-negative soil bacterium possessing the alternative pathway and able to grow using D-glucarate as the only carbon source. Based on the annotation of its sequenced genome (1), we have constructed a complete collection of singlegene deletion mutants (2). High throughput profiling for growth on a minimal medium containing D-glucarate as the only carbon source for approximately 2450 mutants led to the identification of the genes involved in D-glucarate degradation. Protein purification after recombinant production in E. coli allowed us to reconstitute the enzymatic pathway in vitro. We describe here the kinetic characterization of D-glucarate dehydratase, d-5-keto-4-deoxyglucarate dehydratase, and of cooperative alpha-ketoglutarate semialdehyde dehydrogenase. Transcription and expression analyses of the genes involved in D-glucarate metabolism within a single organism made it possible to access information regarding the regulation of this pathway for the first time.
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