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Microbiology and Molecular Biology Reviews, September 2006, p. 583-604, Vol. 70, No. 3
1092-2172/06/$08.00+0     doi:10.1128/MMBR.00015-06
Copyright © 2006, American Society for Microbiology. All Rights Reserved.

A Fungal Family of Transcriptional Regulators: the Zinc Cluster Proteins

Sarah MacPherson,1,{dagger} Marc Larochelle,2 and Bernard Turcotte1,2,3*

Departments of Microbiology and Immunology,1 Medicine,2 Biochemistry, Royal Victoria Hospital, McGill University, Montréal, Québec, Canada H3A 1A13

The trace element zinc is required for proper functioning of a large number of proteins, including various enzymes. However, most zinc-containing proteins are transcription factors capable of binding DNA and are named zinc finger proteins. They form one of the largest families of transcriptional regulators and are categorized into various classes according to zinc-binding motifs. This review focuses on one class of zinc finger proteins called zinc cluster (or binuclear) proteins. Members of this family are exclusively fungal and possess the well-conserved motif CysX2CysX6CysX5-12CysX2CysX6-8Cys. The cysteine residues bind to two zinc atoms, which coordinate folding of the domain involved in DNA recognition. The first- and best-studied zinc cluster protein is Gal4p, a transcriptional activator of genes involved in the catabolism of galactose in the budding yeast Saccharomyces cerevisiae. Since the discovery of Gal4p, many other zinc cluster proteins have been characterized; they function in a wide range of processes, including primary and secondary metabolism and meiosis. Other roles include regulation of genes involved in the stress response as well as pleiotropic drug resistance, as demonstrated in budding yeast and in human fungal pathogens. With the number of characterized zinc cluster proteins growing rapidly, it is becoming more and more apparent that they are important regulators of fungal physiology.

* Corresponding author. Mailing address: Department of Medicine, Room H7.83, Royal Victoria Hospital, McGill University, 687 Pine Ave. West, Montréal, Québec, Canada H3A 1A1. Phone: (514) 934-1934, ext. 35046. Fax: (514) 982-0893. E-mail: bernard.turcotte{at}mcgill.ca.

{dagger} Present address: Division of Infectious Diseases, Department of Internal Medicine, University of Texas Southwestern Medical Center at Dallas, 5323 Harry Hines Blvd., Dallas, TX 75390-9113.

Microbiology and Molecular Biology Reviews, September 2006, p. 583-604, Vol. 70, No. 3
1092-2172/06/$08.00+0     doi:10.1128/MMBR.00015-06
Copyright © 2006, American Society for Microbiology. All Rights Reserved.



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