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The Protein-Binding Potential of C2H2 Zinc Finger Domains

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Abstract

There are over 10,000 C2H2-type zinc finger (ZF) domains distributed among more than 1,000 ZF proteins in the human genome. These domains are frequently observed to be involved in sequence-specific DNA binding, and uncharacterized domains are typically assumed to facilitate DNA interactions. However, some ZFs also facilitate binding to proteins or RNA. Over 100 Cys2-His2 (C2H2) ZF-protein interactions have been described. We initially attempted a bioinformatics analysis to identify sequence features that would predict a DNA- or protein-binding function. These efforts were complicated by several issues, including uncertainties about the full functional capabilities of the ZFs. We therefore applied an unbiased approach to directly examine the potential for ZFs to facilitate DNA or protein interactions. The human OLF-1/EBF associated zinc finger (OAZ) protein was used as a model. The human O/E-1-associated zinc finger protein (hOAZ) contains 30 ZFs in 6 clusters, some of which have been previously indicated in DNA or protein interactions. DNA binding was assessed using a target site selection (CAST) assay, and protein binding was assessed using a yeast two-hybrid assay. We observed that clusters known to bind DNA could facilitate specific protein interactions, but clusters known to bind protein did not facilitate specific DNA interactions. Our primary conclusion is that DNA binding is a more restricted function of ZFs, and that their potential for mediating protein interactions is likely greater. These results suggest that the role of C2H2 ZF domains in protein interactions has probably been underestimated. The implication of these findings for the prediction of ZF function is discussed.

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Acknowledgments

We thank Dr. Joan Massagué for the hOAZ cDNA. This work was supported in part by Contract 9016 from the Arizona Disease Control Research Committee. KJB received support from an NSF IGERT-Genomics award.

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  1. Department of Pharmacology and Toxicology, College of Pharmacy, University of Arizona, Tucson, AZ, 85721, USA

    Kathryn J. Brayer

  2. Genome Center and Department of Pharmacology, University of California, 4513 GBSF, 451 Health Sciences Dr., Davis, CA, 95616, USA

    Sanjeev Kulshreshtha & David J. Segal

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  1. Kathryn J. Brayer
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Correspondence to David J. Segal.

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Brayer, K.J., Kulshreshtha, S. & Segal, D.J. The Protein-Binding Potential of C2H2 Zinc Finger Domains. Cell Biochem Biophys 51, 9–19 (2008). https://doi.org/10.1007/s12013-008-9007-6

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