Phosphatidylglycerophosphate synthase associates with a mitochondrial inner membrane complex and is essential for growth of Trypanosoma brucei

Serricchio, Mauro; Bütikofer, Peter (2013). Phosphatidylglycerophosphate synthase associates with a mitochondrial inner membrane complex and is essential for growth of Trypanosoma brucei. Molecular microbiology, 87(3), pp. 569-79. Oxford: Blackwell Science 10.1111/mmi.12116

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Maintenance of the lipid composition is important for proper function and homeostasis of the mitochondrion. In Trypanosoma brucei, the enzymes involved in the biosynthesis of the mitochondrial phospholipid, phosphatidylglycerol (PG), have not been studied experimentally. We now report the characterization of T. brucei phosphatidylglycerophosphate synthase (TbPgps), the rate-limiting enzyme in PG formation, which was identified based on its homology to other eukaryotic Pgps. Lipid quantification and metabolic labelling experiments show that TbPgps gene knock-down results in loss of PG and a reduction of another mitochondria-specific phospholipid, cardiolipin. Using immunohistochemistry and immunoblotting of digitonin-isolated mitochondria, we show that TbPgps localizes to the mitochondrion. Moreover, reduced TbPgps expression in T. brucei procyclic forms leads to alterations in mitochondrial morphology, reduction in the amounts of respiratory complexes III and IV and, ultimately, parasite death. Using native polyacrylamide gel electrophoresis we demonstrate for the first time in a eukaryotic organism that TbPgps is a component of a 720 kDa protein complex, co-migrating with T. brucei cardiolipin synthase and cytochrome c1, a protein of respiratory complex III.

Item Type:

Journal Article (Original Article)

Division/Institute:

04 Faculty of Medicine > Pre-clinic Human Medicine > Institute of Biochemistry and Molecular Medicine

UniBE Contributor:

Serricchio, Mauro and Bütikofer, Peter

Subjects:

500 Science > 570 Life sciences; biology
600 Technology > 610 Medicine & health

ISSN:

0950-382X

Publisher:

Blackwell Science

Language:

English

Submitter:

Ronja Simone Ulrich

Date Deposited:

10 Mar 2014 10:41

Last Modified:

10 Mar 2014 10:44

Publisher DOI:

10.1111/mmi.12116

PubMed ID:

23190171

URI:

https://boris.unibe.ch/id/eprint/38632

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