J. Biochem, 1996, Vol. 120, No. 4 813-819
© 1996 Japanese Biochemical Society
other |
Structure and Intracellular Localization of Mouse ADP-Ribosylation Factors Type 1 to Type 6 (ARF1ARF6)1
,2

,4
*Institute of Biological Sciences Tsukuba, Ibaraki 305
Institute of Applied Biochemistry, University of Tsukuba Tsukuba, Ibaraki 305
Gene Experiment Center, University of Tsukuba Tsukuba, Ibaraki 305
4To whom correspondence should be addressed at: Institute of Biological Sciences, University of Tsukuba, Tsukuba, Ibaraki 305. Tel: +81-298-53-6356, Fax: +81-298-53-6006, E-mail: kazunaka{at}sakura.cc.tsukuba.ac.jp
ADP-ribosylation factors (ARFs) are a family of small GTP-binding proteins that are proposed to be involved in the formation of coated transport vesicles. Although six ARF sequences have been reported in mammals to date, it has been unclear how many ARF members are present in a single organism. In this study, we provide the first direct evidence by cDNA cloning for the presence of all six ARF members in mouse. These proteins are highly conserved across mammalian species and Northern blot analysis revealed that mRNAs for all the members were expressed ubiquitously. Transfection of cells with epitope-tagged ARFs revealed that ARFs 13 displayed a perinuclear Golgi localization, while ARFs 46 appeared to be widely dispersed throughout the cytoplasm. These results suggest that although all the ARF proteins play fundamental and critical roles in cellular function, they are involved in different vesicular transport processes.
1This study was supported in part by grants from the Ministry of Education, Science, Sports and Culture of Japan, the University of Tsukuba Research Project, the Special Research Project on Circulation Biosystem in the University of Tsukuba, the Saneyoshi Scholarship Foundation, the Ciba-Geigy Foundation (Japan) for the Promotion of Science, the Asahi Glass Foundation, Sankyo Co., and Ono Pharmaceutical Co.
2The first two authors contributed equally to this study.
3Present address: Howard Hughes Medical Institute and Department of Molecular Genetics, University of Texas Southwestern Medical Center, Dallas, Texas 75235-9050, USA.
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