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Molecular and Cellular Biology, March 2000, p. 1649-1658, Vol. 20, No. 5
0270-7306/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

CIZ, a Zinc Finger Protein That Interacts with p130cas and Activates the Expression of Matrix Metalloproteinases

Tetsuya Nakamoto, Tetsuya Yamagata, Ryuichi Sakai,dagger Seishi Ogawa, Hiroaki Honda, Hiroo Ueno, Naoto Hirano, Yoshio Yazaki, and Hisamaru Hirai*

Department of Hematology and Oncology, Graduate School of Medicine, University of Tokyo, Hongo, Tokyo 113-8655, Japan

Received 26 August 1999/Returned for modification 29 September 1999/Accepted 1 December 1999

p130cas (Cas) is a docking protein that contains an SH3 domain and multiple tyrosine residues. p130cas is located at focal adhesions, is tyrosine phosphorylated in response to integrin stimulation, and is thought to transmit signals, via c-Crk and other proteins, for the remodeling of actin stress fibers and cell movement. In a search for the ligands of the SH3 domain of p130cas by far-Western screening, we cloned a novel protein named CIZ (for Cas-interacting zinc finger protein). CIZ consists of the following: a putative leucine zipper; a serine/threonine-rich region; a proline-rich sequence; five, six, or eight Krüppel-type C2H2 zinc fingers; and the glutamine-alanine repeat. CIZ binds Cas in cells and is located in the nucleus and at focal adhesions. We showed that CIZ is a nucleocytoplasmic shuttling protein, by using the transient interspecies heterokaryon formation assay. In order to search for the targets of CIZ in nucleus, we determined the DNA binding consensus of CIZ as (G/C)AAAAA(A) by cyclic amplification and selection of targets analysis. The consensus-like sequences are found in several promoters of matrix metalloproteinases (MMPs), which are the enzymes used to degrade the extracellular matrix proteins. CIZ binds to a consensus-like sequence in the MMP-1 (collagenase) promoter. Overexpression of CIZ upregulates the transcriptions from MMP-1, MMP-3 (stromelysin), and MMP-7 (matrilysin) promoters, and this transactivation was enhanced in the presence of Cas. Furthermore, the stable overexpression of CIZ promoted the production of MMP-7 in culture medium. In summary, CIZ, a novel zinc finger protein, binds Cas, is a nucleocytoplasmic shuttling protein, and regulates the expression of MMPs.

* Corresponding author. Mailing address: Department of Hematology and Oncology, Graduate School of Medicine, University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo 113-8655, Japan. Phone: 81-3-5800-6421. Fax: 81-3-5689-7286. E-mail: hhirai-tky{at}umin.ac.jp.

dagger Present address: Virology Division, National Cancer Center Research Institute, Chuo-ku, Tokyo 104-0045, Japan.

Molecular and Cellular Biology, March 2000, p. 1649-1658, Vol. 20, No. 5
0270-7306/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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