Journal
JOURNAL OF BIOENERGETICS AND BIOMEMBRANES
Volume 44, Issue 3, Pages 333-340Publisher
SPRINGER/PLENUM PUBLISHERS
DOI: 10.1007/s10863-012-9445-0
Keywords
Arabidopsis thaliana; At2g39970 protein; Coenzyme A transporter; Membrane transport; Mitochondrial carrier; Peroxisome
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Funding
- MIUR
- Center of Excellence in Genomics (CEGBA)
- Italian Human ProteomeNet [RBRN07BMCT_009]
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The peroxisomal protein PXN encoded by the Arabidopsis gene At2g39970 has very recently been found to transport NAD(+), NADH, AMP and ADP. In this work we have reinvestigated the substrate specificity and the transport properties of PXN by using a wide range of potential substrates. Heterologous expression in bacteria followed by purification, reconstitution in liposomes, and uptake and efflux experiments revealed that PNX transports coenzyme A (CoA), dephospho-CoA, acetyl-CoA and adenosine 3', 5'-phosphate (PAP), besides NAD(+), NADH, AMP and ADP. PXN catalyzed fast counter-exchange of substrates and much slower uniport and was strongly inhibited by pyridoxal 5'-phosphate, bathophenanthroline and tannic acid. Transport was saturable with a submillimolar affinity for NAD(+), CoA and other substrates. The physiological role of PXN is probably to provide the peroxisomes with the essential coenzymes NAD(+) and CoA.
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