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J Biol Chem, Vol. 273, Issue 9, 5366-5374, February 27, 1998

Isolation and Characterization of a Novel Member of the Neural Zinc Finger Factor/Myelin Transcription Factor Family with Transcriptional Repression Activity

Karen S. Y. Yee and Victor C. Yu

From the Institute of Molecular and Cell Biology, 30 Medical Drive, Singapore 117609, Republic of Singapore

Myelin transcription factor 1 (MyT1) and neural zinc finger factor 1 (NZF-1) represent the first two members of an emerging family of neural specific, zinc finger-containing DNA-binding proteins. MyT1 has been shown recently to play a critical role in neuronal cell differentiation during development. We have cloned the third member of the NZF/MyT family, referred to as neural zinc finger factor 3 (NZF-3). The cDNA sequence predicts a protein of 1,032 amino acids which contains two clusters of zinc fingers similar to MyT1 and NZF-1. Unlike MyT1 and NZF-1, NZF-3 does not contain an acidic domain at the amino terminus or a serine/threonine-rich region between the two finger clusters. NZF-3 binds to a DNA element containing a single copy of the previously described AAAGTTT consensus motif for these factors but exhibits a marked enhancement in relative affinity to a bipartite element containing two copies of the consensus motif. In contrast to MyT1 and NZF-1, which are known to activate transcription, cotransfection experiments revealed that NZF-3 confers repression on the basal activity of promoters containing the consensus binding elements. The identification of an additional member of the NZF/MyT family provides an opportunity to investigate the relative contribution of members of this family of transcription factors to the complex regulatory processes in neural development and homeostasis.

Copyright © 1998 by The American Society for Biochemistry and Molecular Biology, Inc.
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