A developmentally regulated ARF-like 5 protein (ARL5), localized to nuclei and nucleoli, interacts with heterochromatin protein 1

Ching Y. Lin, Chun Chun Li, Pei Hsin Huang, Fang Jen S. Lee

研究成果: Review article同行評審

33 引文 斯高帕斯(Scopus)

摘要

ARF-like proteins (ARLs) are distinct group of members or the ARF family of Ras-related GTPases. Although ARLs are very similar in primary structure to ARFs, their functions remain unclear. We cloned mouse (m) and human (h) ARL5 cDNAs to characterize the protein products and their molecular properties. mARL5 mRNA was more abundant in liver than in other adult tissues tested. mARL5, similar to mARL4, was developmentally regulated and localized to nuclei. hARL5 interacted with importin-α through its C-terminal bipartite nuclear localization signal. When expressed in COS-7 cells, mutant hARL5(T35N), which is predicted to be GDP bound, was concentrated in nucleoli. The N-terminus of hARL5, like that of ARF, was myristoylated. Yeast two-hybrid screening and in vitro protein-interaction assays showed that hARL5(Q80L), predicted to be GTP bound, interacted with heterochromatin protein 1α (HP1α), which is known to be associated with telomeres as well as with heterochromatin, and acted as a transcriptional suppressor in mammalian cells. The interaction was reproduced in COS cells, where hARL5(Q80L) was co-immunoprecipitated with HP1α. hARL5 interaction with HP1α was dependent on the nucleotide bound, and required the MIR-like motif. Moreover, hARL5(Q80L), but not hARL5 lacking the MIR-like motif, was partly co-localized with overexpressed HP1α. Our findings suggest that developmentally regulated ARL5, with its distinctive nuclear/nucleolar localization and interaction with HP1α, may play a role(s) in nuclear dynamics and/or signaling cascades during embryonic development.

原文English
頁(從 - 到)4433-4445
頁數13
期刊Journal of Cell Science
115
發行號23
DOIs
出版狀態Published - 2002 十二月 1

All Science Journal Classification (ASJC) codes

  • Cell Biology

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