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J Biol Chem, Vol. 273, Issue 31, 19656-19663, July 31, 1998
From the Departments of The retinitis pigmentosa
GTPase regulator (RPGR) gene
encodes a protein homologous to the RCC1 guanine nucleotide exchange factor and is mutated in 20% of patients with X-linked retinitis pigmentosa. We have characterized the full-length and variant cDNAs
corresponding to the mouse homolog of the RPGR gene
(mRpgr). Comparison with the human cDNA revealed
sequence identity primarily in the region of RCC1 homology repeats. As
in humans, the mRpgr gene maps within 50 kilobases from the
5'-end of the Otc gene. The mRpgr transcripts are detected
as early as E7 during embryonic development and are expressed widely in
the adult mice. Variant mRpgr isoforms are generated by alternative
splicing and by utilizing two in-frame initiation codons. The products
of mRpgr cDNAs migrate aberrantly in SDS-polyacrylamide gels
because of a charged domain. In transfected COS cells, the mRpgr
protein is isoprenylated and is localized in the Golgi complex. This
subcellular distribution is not observed after treatments with
brefeldin A or mevastatin and when the conserved isoprenylation
sequence (CTIL) at the carboxyl terminus is deleted or mutagenized.
These studies suggest a role for the mRpgr protein in Golgi transport
and form the basis for investigating the mechanism of photoreceptor
degeneration in X-linked retinitis pigmentosa.
Biochemical Characterization and Subcellular Localization of the
Mouse Retinitis Pigmentosa GTPase Regulator (mRpgr)
,
,
,
,
,
§
Ophthalmology,
§ Human Genetics, and
Radiation Oncology, University
of Michigan, Ann Arbor, Michigan 48105
Copyright © 1998 by The American Society for Biochemistry and Molecular Biology, Inc.
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