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News & Notes: Buchnera Plasmid-Associated trpEG Probably Originated from a Chromosomal Location Between hsIU and fpr

News & Notes: Buchnera Plasmid-Associated trpEG Probably Originated from a Chromosomal Location... Buchnera are prokaryotic endosymbionts found in most aphids. One of their functions is the synthesis of the essential amino acid tryptophan for the aphid host. In Buchnera from some aphids that have a long development time, trpEG, which encodes the first enzyme of the tryptophan biosynthetic pathway (anthranilate synthase), is found as one copy on the endosymbiont chromosome and is located between hsIU and fpr. In Buchnera from Schizaphis graminum, which has a short development time, trpEG is amplified on plasmids. We have cloned and sequenced a 4.1-kb DNA fragment from Buchnera of S. graminum and have found the gene order hsIU-ibp-fpr-yjeA-kdtB. The proximity of hsIU and fpr is consistent with the excision, in an endosymbiont ancestor, of trpEG from a location between these two genes, with the excision either followed or preceded by acquisition of ibp. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Current Microbiology Springer Journals

News & Notes: Buchnera Plasmid-Associated trpEG Probably Originated from a Chromosomal Location Between hsIU and fpr

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References (19)

Publisher
Springer Journals
Copyright
Copyright © 1999 by Springer-Verlag New York Inc.
Subject
Life Sciences; Microbiology; Biotechnology
ISSN
0343-8651
eISSN
1432-0991
DOI
10.1007/PL00006807
Publisher site
See Article on Publisher Site

Abstract

Buchnera are prokaryotic endosymbionts found in most aphids. One of their functions is the synthesis of the essential amino acid tryptophan for the aphid host. In Buchnera from some aphids that have a long development time, trpEG, which encodes the first enzyme of the tryptophan biosynthetic pathway (anthranilate synthase), is found as one copy on the endosymbiont chromosome and is located between hsIU and fpr. In Buchnera from Schizaphis graminum, which has a short development time, trpEG is amplified on plasmids. We have cloned and sequenced a 4.1-kb DNA fragment from Buchnera of S. graminum and have found the gene order hsIU-ibp-fpr-yjeA-kdtB. The proximity of hsIU and fpr is consistent with the excision, in an endosymbiont ancestor, of trpEG from a location between these two genes, with the excision either followed or preceded by acquisition of ibp.

Journal

Current MicrobiologySpringer Journals

Published: May 1, 1999

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