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Plant and Cell Physiology Advance Access originally published online on April 1, 2008
Plant and Cell Physiology 2008 49(5):858-863; doi:10.1093/pcp/pcn053
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© The Author 2008. Published by Oxford University Press on behalf of Japanese Society of Plant Physiologists. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org

Short Communication

ACTIN-RELATED PROTEIN8 Encodes an F-Box Protein Localized to the Nucleolus in Arabidopsis

Muthugapatti K. Kandasamy, Elizabeth C. McKinney and Richard B. Meagher*

Genetics Department, Davison Life Sciences Building, University of Georgia, Athens, GA 30602, USA

*Corresponding author: E-mail, meagher{at}uga.edu; Fax, +1-706-542-1387.


  Abstract

Arabidopsis encodes six nuclear actin-related proteins (ARPs), among them ARP8 is unique in having an F-box domain and an actin homology domain. Analysis of the ARP8 promoter–β-glucuronidase (GUS) fusion suggests that ARP8 is ubiquitously expressed in all organs and cell types. Immunocytochemical analysis with ARP8-specific monoclonal antibodies revealed that ARP8 protein is localized to the nucleolus in interphase cells and dispersed in the cytoplasm in mitotic cells. The cell cycle-dependent subcellular patterns of distribution of ARP8 are conserved in other members of Brassicaceae. Our findings provide the first insight into the possible contributions of plant ARP8 to nucleolar functions.

Keywords: ARP8 - Chromatin remodeling - Nuclear actin-related proteins - Nucleolar functions - Ribosome biogenesis

Abbreviations: ARP, actin-related protein; DAPI, 4',6-diamidino-2-phenylindole; GUS, β-glucuronidase; HAT, histone acetyltransferase; HVE, histone variant exchange; NOR, nucleolar organizing region; NR, nucleosome movement and remodeling; PEPC, phosphoenolpyruvate carboxylase.

(Received February 7, 2008; Accepted March 27, 2008)
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