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Applied and Environmental Microbiology, May 2002, p. 2572-2575, Vol. 68, No. 5
0099-2240/02/$04.00+0     DOI: 10.1128/AEM.68.5.2572-2575.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

Molecular Characterization of the Leucine Cluster in Buchnera sp. Strain PSY, a Primary Endosymbiont of the Aphid Pemphigus spyrothecae

Beatriz Sabater-Muñoz,1 Laura Gómez-Valero,1 Roeland C. H. J. van Ham,2 Francisco J. Silva,1 and Amparo Latorre1*

Institut Cavanilles de Biodiversitat i Biologia Evolutiva, Universitat de València, València 46071,1 Centro de Astrobiología, INTA-CSIC, Madrid, Spain2

Received 21 November 2001/ Accepted 5 February 2002

Buchnera strains from most aphid subfamilies studied to date have been found to carry the leucine gene cluster (leuA, -B, -C, and -D) on a plasmid, an organization unique among bacteria. Here, however, we demonstrate a classical chromosomal location of the cluster in Buchnera sp. strain PSY from the aphid Pemphigus spyrothecae (subfamily Pemphiginae). The genes that flank leuABCD in Buchnera sp. strain PSY appear to be adjacent in the genome of Buchnera sp. strain APS, a strain carrying a leucine plasmid. We propose that the presence of a leucine plasmid predates the diversification of symbiotic Buchnera and that the chromosomal location observed in Buchnera sp. strain PSY arose by a transfer of the leucine genes from a plasmid to the chromosome.

* Corresponding author. Mailing address: Institut Cavanilles de Biodiversitat i Biologia Evolutiva, Universitat de València, Apartat oficial 22085, València 46071, Spain. Phone: (34) 963983649. Fax: (34) 963983670. E-mail: amparo.latorre{at}uv.es.

Applied and Environmental Microbiology, May 2002, p. 2572-2575, Vol. 68, No. 5
0099-2240/02/$04.00+0     DOI: 10.1128/AEM.68.5.2572-2575.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.



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