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Journal of Cell Science 114, 3093-3102 (2001)
© 2001 The Company of Biologists Limited

RESEARCH ARTICLE

A specific targeting signal directs Runx2/Cbfa1 to subnuclear domains and contributes to transactivation of the osteocalcin gene

S. Kaleem Zaidi, Amjad Javed, Je-Yong Choi*, André J. van Wijnen, Janet L. Stein, Jane B. Lian and Gary S. Stein{ddagger}

Department of Cell Biology and Cancer Center, University of Massachusetts Medical School, Worcester, MA 01655-0106, USA
* Present address: Department of Biochemistry, School of Medicine, Kyungpook National University, 101 Dong-In Jung-Gu, Daegu 700-422, Korea

{ddagger}Author for correspondence (e-mail: gary.stein{at}umassmed.edu)

Accepted May 21, 2001

Key components of DNA replication and the basal transcriptional machinery as well as several tissue-specific transcription factors are compartmentalized in specialized nuclear domains. In the present study, we show that determinants of subnuclear targeting of the bone-related Runx2/Cbfa1 protein reside in the C-terminus. With a panel of C-terminal mutations, we further demonstrate that targeting of Runx2 to discrete subnuclear foci is mediated by a 38 amino acid sequence (aa 397-434). This nuclear matrix-targeting signal (NMTS) directs the heterologous Gal4 protein to nuclear-matrix-associated Runx2 foci and enhances transactivation of a luciferase gene controlled by Gal4 binding sites. Importantly, we show that targeting of Runx2 to the NM-associated foci contributes to transactivation of the osteoblast-specific osteocalcin gene in osseous cells. Taken together, these findings identify a critical component of the mechanisms mediating Runx2 targeting to subnuclear foci and provide functional linkage between subnuclear organization of Runx2 and bone-specific transcriptional control.

Key words: Osteoblasts, Transcriptional control, Nuclear matrix, Osteocalcin, Nuclear localization


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© The Company of Biologists Ltd 2001