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Molecular and Cellular Biology, October 1999, p. 6720-6728, Vol. 19, No. 10
0270-7306/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
A Transcriptional Switch in the Expression of Yeast
Tricarboxylic Acid Cycle Genes in Response to a Reduction or Loss
of Respiratory Function
Zhengchang
Liu and
Ronald A.
Butow*
Department of Molecular Biology, University
of Texas Southwestern Medical Center, Dallas, Texas 75235-9148
Received 22 April 1999/Returned for modification 11 June
1999/Accepted 2 July 1999
The Hap2,3,4,5p transcription complex is required for expression of
many mitochondrial proteins that function in electron transport and the
tricarboxylic acid (TCA) cycle. We show that as the cells' respiratory
function is reduced or eliminated, the expression of four TCA cycle
genes, CIT1, ACO1, IDH1, and
IDH2, switches from HAP control to control by
three genes, RTG1, RTG2, and RTG3.
The expression of four additional TCA cycle genes downstream of
IDH1 and IDH2 is independent of the
RTG genes. We have previously shown that the
RTG genes control the retrograde pathway, defined as a
change in the expression of a subset of nuclear genes, e.g., the
glyoxylate cycle CIT2 gene, in response to changes in the functional state of mitochondria. We show that the
cis-acting sequence controlling RTG-dependent
expression of CIT1 includes an R box element, GTCAC,
located 70 bp upstream of the Hap2,3,4,5p binding site in the
CIT1 upstream activation sequence. The R box is a binding
site for Rtg1p-Rtg3p, a heterodimeric, basic helix-loop-helix/leucine zipper transcription factor complex. We propose that in cells with
compromised mitochondrial function, the RTG genes take
control of the expression of genes leading to the synthesis of
-ketoglutarate to ensure that sufficient glutamate is available for
biosynthetic processes and that increased flux of the glyoxylate cycle,
via elevated CIT2 expression, provides a supply of
metabolites entering the TCA cycle sufficient to support anabolic
pathways. Glutamate is a potent repressor of RTG-dependent
expression of genes encoding both mitochondrial and nonmitochondrial
proteins, suggesting that it is a specific feedback regulator of the
RTG system.
*
Corresponding author. Mailing address: Department of
Molecular Biology, University of Texas Southwestern Medical Center,
5323 Harry Hines Blvd., Dallas, TX 75235-9148. Phone: (214) 648-1465. Fax: (214) 648-1488. E-mail: butow{at}swmed.edu.

This paper is dedicated to our friend and colleague, Paul
Srere.
Molecular and Cellular Biology, October 1999, p. 6720-6728, Vol. 19, No. 10
0270-7306/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
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