[en] Double homeodomain (DUX) proteins are encoded by a family of 3.3-kilobase repeated elements dispersed in the human genome. One of these elements named D4Z4 is found in a tandem repeat array on chromosome 4 that is partially deleted in facioscapulohumeral muscular dystrophy. We have evaluated the trafficking and mobility of two DUX proteins, DUX1 and DUX4. We transfected C2C12 myoblasts with cDNA encoding these proteins fused to the green fluorescent protein and studied their intracellular localization and diffusional mobilities using fluorescence recovery after photobleaching and fluorescence loss in photobleaching. We also studied truncated forms of the proteins, containing one or both homeodomains or a region outside the homeodomains. We show that both full-length proteins are actively transported into the nucleus, and that the homeodomains contain the signals required for this localization. DUX1 is more mobile than DUX4 within the nucleus (t(1/2) = 4.8 s for DUX1 and 13.4 s for DUX4), suggesting differences in the way the two proteins interact with nuclear components.
Disciplines :
Biotechnology Zoology
Author, co-author :
Östlund, Cecilia
Garcia-Carrasquillo, Ruth M.
Belayew, Alexandra ; Université de Mons > Faculté de Médecine et de Pharmacie > Biochimie métabolique et moléculaire
Worman, Howard J.
Language :
English
Title :
Intracellular Trafficking and Dynamics of Double Homeodomain Proteins
Publication date :
01 February 2005
Journal title :
Biochemistry
ISSN :
0006-2960
Publisher :
American Chemical Society, Washington, United States - District of Columbia
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