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Type: Journal article
Title: Molecular cloning reveals that the p160 Myb-binding protein is a novel, predominantly necleolar protein which may play a role in transactivation by Myb
Author: Tavner, F.
Simpson, R.
Tashiro, S.
Favier, D.
Jenkins, N.
Gilbert, D.
Copeland, N.
MacMillan, E.
Lutwyche, J.
Keough, R.
Ishii, S.
Gonda, T.
Citation: Molecular and Cellular Biology, 1998; 18(2):989-1002
Publisher: American Society for Microbiology
Issue Date: 1998
ISSN: 0270-7306
Statement of
Fiona J. Tavner, Richard Simpson, Shigeki Tashiro, Diane Favier, Nancy A. Jenkins, Debra J. Gilbert, Neal G. Copeland, Elizabeth M. Macmillan, Jodi Lutwyche, Rebecca A. Keough, Shunsuke Ishii and Thomas J. Gonda
Abstract: We have previously detected two related murine nuclear proteins, p160 and p67, that can bind to the leucine zipper motif within the negative regulatory domain of the Myb transcription factor. We now describe the molecular cloning of cDNA corresponding to murine p160. The P160 gene is located on mouse chromosome 11, and related sequences are found on chromosomes 1 and 12. The predicted p160 protein is novel, and in agreement with previous studies, we find that the corresponding 4.5-kb mRNA is ubiquitously expressed. We showed that p67 is an N-terminal fragment of p160 which is generated by proteolytic cleavage in certain cell types. The protein encoded by the cloned p160 cDNA and an engineered protein (p67*) comprising the amino-terminal region of p160 exhibit binding specificities for the Myb and Jun leucine zipper regions identical to those of endogenous p160 and p67, respectively. This implies that the Myb-binding site of p160 lies within the N-terminal 580 residues and that the Jun-binding site is C-terminal to this position. Moreover, we show that p67* but not p160 can inhibit transactivation by Myb. Unexpectedly, immunofluorescence studies show that p160 is localized predominantly in the nucleolus. The implications of these results for possible functions of p160 are discussed.
Keywords: 3T3 Cells
Carrier Proteins
RNA-Binding Proteins
DNA-Binding Proteins
Proto-Oncogene Proteins c-myb
Proto-Oncogene Proteins
Nuclear Proteins
Transcription Factors
DNA, Complementary
RNA, Messenger
Chromosome Mapping
Cloning, Molecular
Amino Acid Sequence
Base Sequence
Molecular Sequence Data
Protein-Tyrosine Kinases
Transcriptional Activation
Rights: Copyright © 1998, American Society for Microbiology
DOI: 10.1128/MCB.18.2.989
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