Characterization of mutated protein encoded by partially duplicated fibrillin-1 gene in tight skin (TSK) mice.
Fibrillin-1 (Fbn-1) is a ubiquitous protein present in the extracellular matrix of various organs and it is a major component of microfibrils embedded in the core of elastic fibers. In humans, mutations or deletions of the Fbn-1 gene are associated with several genetic diseases. In addition, several microsatellite alleles near Fbn-1 gene were found associated with diffuse scleroderma. In TSK/+ mice, which develop a scleroderma-like syndrome, the Fbn-1 gene exhibits an inframe duplication of exons 17-40. In this study, we report that the synthesis and secretion of wild-type Fbn-1 in TSK/+ is higher than that of the mutated Fbn-1 protein excluding the possibility that TSK genetic defect is due to a loss of the wild allele. We also demonstrate for the first time that TGF-beta, which plays a crucial role in skin fibrosis, binds to both wild-type and mutated Fbn-1. The amount of bound TGF-beta was higher in mutated than wild-type Fbn-1 and appears related to the number of TGF-beta binding motifs.
Saito
S
S
Department of Microbiology, Mount Sinai School of Medicine, New York, NY 10029, USA.
Nishimura
H
H
Brumeanu
T D
TD
Casares
S
S
Stan
A C
AC
Honjo
T
T
Bona
C A
CA
D000818:Animals; D019556:COS Cells; D002478:Cells, Cultured; D016326:Extracellular Matrix Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D005260:Female; D000071838:Fibrillin-1; D000071837:Fibrillins; D005347:Fibroblasts / Q000378:metabolism; D020440:Gene Duplication; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D008817:Mice, Mutant Strains; D008840:Microfilament Proteins / Q000737:chemistry* / Q000235:genetics* / Q000378:metabolism; D009154:Mutation / Q000235:genetics*; D016212:Transforming Growth Factor beta / Q000378:metabolism; D054392:Adipokines
D016326:Extracellular Matrix Proteins; D000071838:Fibrillin-1; D000071837:Fibrillins; D008840:Microfilament Proteins; D016212:Transforming Growth Factor beta; C000605722:FBN1 protein, human; D054392:Adipokines; C000605724:Fbn1 protein, mouse