Signalling between mitochondria and the nucleus regulates the expression of a new d-lactate dehydrogenase activity in yeast
Article first published online: 27 SEP 1999
Copyright © 1999 John Wiley & Sons, Ltd.
Volume 15, Issue 13, pages 1377–1391, 30 September 1999
How to Cite
Chelstowska, A., Liu, Z., Jia, Y., Amberg, D. and Butow, R. A. (1999), Signalling between mitochondria and the nucleus regulates the expression of a new d-lactate dehydrogenase activity in yeast. Yeast, 15: 1377–1391. doi: 10.1002/(SICI)1097-0061(19990930)15:13<1377::AID-YEA473>3.0.CO;2-0
- Issue published online: 27 SEP 1999
- Article first published online: 27 SEP 1999
- Manuscript Accepted: 18 MAY 1999
- Manuscript Received: 10 MAR 1999
- National Institutes of Health, U.S.A.. Grant Number: GM22525
- Robert A. Welch Foundation, U.S.A.. Grant Number: I-0642
- retrograde regulation;
- D-lactate dehydrogenase activities
We have adapted a LacZ promoter trap screen developed by Burns et al.(1994) to search for genes whose expression is dependent on Rtg2p, a protein with an N-terminal hsp70/actin/sugar kinase ATP binding domain. Rtg2p acts upstream of the basic helix–loop–helix/leucine zipper transcription factors, Rtg1p and Rtg3p. All three proteins are known to be required for the expression of the CIT2 gene, which encodes a peroxisomal isoform of citrate synthase whose expression is also dependent on the functional state of mitochondria. Using this screen, we have identified a previously uncharacterized gene, YEL071w, predicted to encode a protein of 496 amino acids that shares 80% homology and 60% sequence identity with actin interacting protein 2, encoded by the AIP2 gene; both proteins also share sequence similarity to aD-lactate dehydrogenase encoded by the DLD1 gene. Expression of YEL071w is dependent on the functional state of mitochondria and on all three of the Rtg proteins, whereas AIP2 expression is independent of the Rtg proteins and the functional state of mitochondria. Like CIT2, the 5′ flanking region of YEL071w contains two R box binding sites for the Rtg1p/Rtg3p heterodimeric transcription complex. Both R boxes are necessary for full YEL071w expression. We show that YEL071w and AIP2 encode proteins withD-lactate dehydrogenase activity, the former located in the cytoplasm and the latter in the mitochondrial matrix. Our data thus provide gene assignments for two previously unrecognizedD-lactate dehydrogenase activities in yeast. Copyright © 1999 John Wiley & Sons, Ltd.