A eukaryote-like cardiolipin synthase is present in Streptomyces coelicolor and in most actinobacteria.

Published

Journal Article

Cardiolipin (CL) is an anionic membrane lipid present in bacteria, plants, and animals, but absent from archaea. It is generally thought that bacteria use an enzyme belonging to the phospholipase D superfamily as cardiolipin synthase (Cls) catalyzing a reversible phosphatidyl group transfer from one phosphatidylglycerol (PG) molecule to another PG to form CL and glycerol. In contrast, in eukaryotes a Cls of the CDP-alcohol phosphatidyltransferase superfamily uses cytidine diphosphate-diacylglycerol (CDP-DAG) as the donor of the phosphatidyl group, which is transferred to a molecule of PG to form CL. Searching the genome of the actinomycete Streptomyces coelicolor A3(2) we identified a gene coding for a putative Cls of the CDP-alcohol phosphatidyltransferase superfamily (Sco1389). Here we show that expression of Sco1389 in a CL-deficient Rhizobium etli mutant restores CL formation. In an in vitro assay Sco1389 condenses CDP-DAG with PG to form CL and therefore catalyzes the same reaction as eukaryotic cardiolipin synthases. This is the first time that a CDP-alcohol phosphatidyltransferase from bacteria is shown to be responsible for CL formation. The broad occurrence of putative orthologues of Sco1389 among the actinobacteria suggests that CL synthesis involving a eukaryotic type Cls is common in actinobacteria.

Full Text

Duke Authors

Cited Authors

  • Sandoval-Calderón, M; Geiger, O; Guan, Z; Barona-Gómez, F; Sohlenkamp, C

Published Date

  • June 26, 2009

Published In

Volume / Issue

  • 284 / 26

Start / End Page

  • 17383 - 17390

PubMed ID

  • 19439403

Pubmed Central ID

  • 19439403

International Standard Serial Number (ISSN)

  • 0021-9258

Digital Object Identifier (DOI)

  • 10.1074/jbc.M109.006072

Language

  • eng

Conference Location

  • United States