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Genetics and Molecular Biology |
Institute of Biotechnology, Technical University of Berlin, Seestrasse 13,D-13353 Berlin, Germany1
Author for correspondence: Otto Geiger. Tel: +52 73 131697. Fax: +52 73 175581. e-mail: Otto{at}cifn.unam.mx
In rhizobia, besides the constitutive acyl carrier protein (AcpP) involved in the biosynthesis and transfer of common fatty acids, there are at least three specialized acyl carrier proteins (ACPs): (1) the flavonoid-inducible nodulation protein NodF; (2) the RkpF protein, which is required for the biosynthesis of rhizobial capsular polysaccharides; and (3) AcpXL, which transfers 27-hydroxyoctacosanoic acid to a sugar backbone during lipid A biosynthesis. Whereas the nucleotide sequences encoding the three specialized ACPs are known, only the amino acid sequence of the AcpP of Sinorhizobium meliloti was available. In this study, using reverse genetics, the genes for the constitutive AcpPs of S. meliloti and of Rhizobium leguminosarum were cloned and sequenced. Previously, it had been shown that NodF and RkpF can be overproduced in Escherichia coli using the T7 polymerase expression system. Using the same system, the constitutive AcpPs of S. meliloti and of R. leguminosarum, together with the specialized ACP AcpXL, were overproduced and purified. All the known ACPs of rhizobia can be labelled in vivo during expression in E. coli with radioactive ß-alanine added to the growth medium due to their modification with a 4’-phosphopantetheine prosthetic group. The availability of all functionally different ACPs should help to unravel how different fatty acids are targeted towards different biosynthetic pathways in one organism.
Keywords: Rhizobium, acyl carrier protein, acpP, acpXL
Abbreviations: ACP, acyl carrier protein; iPCR, inverse PCR
The GenBank accession numbers for the nucleotide sequences reported in this paper are AF159244 and AF159243 for the acpP-containing regions of Sinorhizobium meliloti 1021 and of Rhizobium leguminosarum LPR5045, respectively.
a Present address: CIFN – UNAM, Av. Universidad s/n, Colonia Chamilpa, Apdo postal 565-A, CP 62210, Cuernavaca, Morelos, Mexico.
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