Archvillin anchors in the Z-line of skeletal muscle via the nebulin C-terminus |
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Authors: | Lee Min-A Joo Young Mi Lee Yeong Mi Kim Hyun Suk Kim Ji-Hee Choi Jae-Kyong Ahn Seung-Ju Min Byung-In Kim Chong-Rak |
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Institution: | a Department of Biology, Inje University, Gimhae 621-749, Republic of Korea b Department of Biomedical Laboratory Science, Inje University, 607 Obang-Dong, Gimhae 621-749, Republic of Korea c Department of Clinical Pathology, Daegu Health College, Daegu 702-722, Republic of Korea d Department of Radiation-Applied Engineering, Inje University, Gimhae 621-749, Republic of Korea |
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Abstract: | Z-Line of skeletal muscle is a complex protein network that likely plays an important role in signaling and muscle homeostasis. We used the yeast two-hybrid system to search for potential novel ligands of the Z-line portion of nebulin. We found that the C-terminal region of nebulin (residues 6457-6528) interacted with the C-terminus of archvillin (residues 1419-1687). Archvillin is a membrane skeletal protein that localizes to costameres, specialized adhesion sites in muscle. The binding sites between nebulin and archvillin were characterized using the yeast two-hybrid system, in vitro pull-down assays, and colocalization experiments in COS-7 cells. Our data suggest a model in which archvillin attaches directly to the Z-line through an interaction with the nebulin C-terminus. The interaction between nebulin and archvillin may provide a direct link between the sarcolemma and myofibrillar Z-lines. |
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Keywords: | Nebulin Archvillin Costamere Z-Line Yeast two-hybrid |
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