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Hirayama, E. et al.

Etsuko Hirayama, Jeman Kim,

Identification and characterization of a novel neural cell adhesion molecule (NCAM)-associated protein from quail myoblasts: relationship to myotube formation and induction of neurite-like protrusions.

We identified a novel neural cell adhesion molecule (NCAM)-associated protein, myogenesis-related and NCAM-associated protein (MYONAP), the expression of which increases during the formation of myotubes in quail myoblasts transformed with a temperature-sensitive mutant of Rous sarcoma virus (QM-RSV cells). MYONAP shares homology with PL48 in human cytotrophoblasts and KIAA0386 in human brain. Excess expression of MYONAP in presumptive QM-RSV myoblasts induced long protrusions like neurites in cooperation with microtubules. Suppression of MYONAP by antisense cDNA prevented myotubes from forming in spite of the expression of myogenin, creatine kinase, and myosin, and rendered myoblast membranes resistant to fusion. Yeast two-hybrid screening showed that MYONAP interacted with NCAM specifically. Deletion of the NCAM-associated domain resulted in a loss of the function that induces neurite-like protrusions to form and disturbed the elongation of microtubules. The results suggested that MYONAP influenced the functions of microtubules and was involved in the formation of myotubes via its interaction with NCAM.[1]

References

Identification and characterization of a novel neural cell adhesion molecule (NCAM)-associated protein from quail myoblasts: relationship to myotube formation and induction of neurite-like protrusions. Hirayama, E., Kim, J. Differentiation (2008) [Pubmed]

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