The ubiquitin-specific protease USP25 interacts with three sarcomeric proteins.
The biological functions of the more than one hundred genes coding for deubiquitinating enzymes in the human genome remain mostly unknown. The USP25 gene, located at 21q11.2, encodes three protein isoforms produced by alternative splicing. While two of the isoforms are expressed nearly ubiquituously, the expression of the longer USP25 ... isoform (USP25m) is restricted to muscular tissues and is upregulated during myogenesis. USP25m interacts with three sarcomeric proteins: actin alpha-1 (ACTA1), filamin C (FLNC), and myosin binding protein C1 (MyBPC1), which are critically involved in muscle differentiation and maintenance, and have been implicated in the pathogenesis of severe myopathies. Biochemical analyses demonstrated that MyBPC1 is a short-lived proteasomal substrate, and its degradation is prevented by over-expression of USP25m but not by other USP25 isoforms. In contrast, ACTA1 and FLNC appear to be stable proteins, indicating that their interaction with USP25m is not related to their turnover rate.
Mesh Terms:
Actins, Alternative Splicing, Animals, Carrier Proteins, Cell Differentiation, Cell Line, Cells, Cultured, Contractile Proteins, Endopeptidases, Humans, Mice, Microfilament Proteins, Sarcomeres, Ubiquitin Thiolesterase
Actins, Alternative Splicing, Animals, Carrier Proteins, Cell Differentiation, Cell Line, Cells, Cultured, Contractile Proteins, Endopeptidases, Humans, Mice, Microfilament Proteins, Sarcomeres, Ubiquitin Thiolesterase
Cell. Mol. Life Sci.
Date: Mar. 01, 2006
PubMed ID: 16501887
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