In Vitro Characterization of the Enzyme Properties of the Phospholipid N -Methyltransferase PmtA from Agrobacterium tumefaciens
10.1128/jb.01591-08
Crossref journal-article
American Society for Microbiology
Journal of Bacteriology (235)
Abstract

ABSTRACT Agrobacterium tumefaciens requires phosphatidylcholine (PC) in its membranes for plant infection. The phospholipid N -methyltransferase PmtA catalyzes all three transmethylation reactions of phosphatidylethanolamine (PE) to PC via the intermediates monomethylphosphatidylethanolamine (MMPE) and dimethylphosphatidylethanolamine (DMPE). The enzyme uses S -adenosylmethionine (SAM) as the methyl donor, converting it to S -adenosylhomocysteine (SAH). Little is known about the activity of bacterial Pmt enzymes, since PC biosynthesis in prokaryotes is rare. In this article, we present the purification and in vitro characterization of A. tumefaciens PmtA, which is a monomeric protein. It binds to PE, the intermediates MMPE and DMPE, the end product PC, and phosphatidylglycerol (PG) and phosphatidylinositol. Binding of the phospholipid substrates precedes binding of SAM. We used a coupled in vitro assay system to demonstrate the enzymatic activity of PmtA and to show that PmtA is inhibited by the end products PC and SAH and the antibiotic sinefungin. The presence of PG stimulates PmtA activity. Our study provides insights into the catalysis and control of a bacterial phospholipid N -methyltransferase.

Bibliography

Aktas, M., & Narberhaus, F. (2009). In Vitro Characterization of the Enzyme Properties of the Phospholipid N -Methyltransferase PmtA from Agrobacterium tumefaciens. Journal of Bacteriology, 191(7), 2033–2041.

Authors 2
  1. Meriyem Aktas (first)
  2. Franz Narberhaus (additional)
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Dates
Type When
Created 16 years, 7 months ago (Jan. 30, 2009, 8:45 p.m.)
Deposited 4 years, 1 month ago (July 29, 2021, 1:11 p.m.)
Indexed 3 months ago (May 28, 2025, 6:05 p.m.)
Issued 16 years, 5 months ago (April 1, 2009)
Published 16 years, 5 months ago (April 1, 2009)
Published Print 16 years, 5 months ago (April 1, 2009)
Funders 0

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@article{Aktas_2009, title={In Vitro Characterization of the Enzyme Properties of the Phospholipid N -Methyltransferase PmtA from Agrobacterium tumefaciens}, volume={191}, ISSN={1098-5530}, url={http://dx.doi.org/10.1128/jb.01591-08}, DOI={10.1128/jb.01591-08}, number={7}, journal={Journal of Bacteriology}, publisher={American Society for Microbiology}, author={Aktas, Meriyem and Narberhaus, Franz}, year={2009}, month=apr, pages={2033–2041} }