Kettin, a major source of myofibrillar stiffness in Drosophila indirect flight muscle

Kulke M, Neagoe C, Kolmerer B, Minajeva A, Hinssen H, Bullard B, Linke WA (2001)
JOURNAL OF CELL BIOLOGY 154(5): 1045-1058.

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Zeitschriftenaufsatz | Veröffentlicht | Englisch
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Abstract / Bemerkung
Kettin is a high molecular mass protein of insect muscle that in the sarcomeres binds to actin and a-actinin. To investigate kettin's functional role, we combined immunolabeling experiments with mechanical and biochemical studies on indirect flight muscle (IFM) myofibrils of Drosophila melanogaster. Micrographs of stretched IFM sarcomeres labeled with kettin antibodies revealed staining of the Z-disc periphery. After extraction of the kettin-associated actin, the A-band edges were also stained. In contrast, the staining pattern of projectin, another IFM-1-band protein, was not altered by actin removal. Force measurements were performed on single IFM myofibrils to establish the passive length-tension relationship and record passive stiffness. Stiffness decreased within seconds during gelsolin incubation and to a similar degree upon kettin digestion with mu -calpain. Immunoblotting demonstrated the presence of kettin isoforms in normal Drosophila IFM myofibrils and in myofibrils from an actin-null mutant. Dotblot analysis revealed binding of COOH-terminal kettin domains to myosin. We conclude that kettin is attached not only to actin but also to the end of the thick filament. Kettin along with projectin may constitute the elastic filament system of insect IFM and determine the muscle's high stiffness necessary for stretch activation. Possibly, the two proteins modulate myofibrillar stiffness by expressing different size isoforms.
Erscheinungsjahr
Zeitschriftentitel
JOURNAL OF CELL BIOLOGY
Band
154
Zeitschriftennummer
5
Seite
1045-1058
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Kulke M, Neagoe C, Kolmerer B, et al. Kettin, a major source of myofibrillar stiffness in Drosophila indirect flight muscle. JOURNAL OF CELL BIOLOGY. 2001;154(5):1045-1058.
Kulke, M., Neagoe, C., Kolmerer, B., Minajeva, A., Hinssen, H., Bullard, B., & Linke, W. A. (2001). Kettin, a major source of myofibrillar stiffness in Drosophila indirect flight muscle. JOURNAL OF CELL BIOLOGY, 154(5), 1045-1058. doi:10.1083/jcb.200104016
Kulke, M., Neagoe, C., Kolmerer, B., Minajeva, A., Hinssen, H., Bullard, B., and Linke, W. A. (2001). Kettin, a major source of myofibrillar stiffness in Drosophila indirect flight muscle. JOURNAL OF CELL BIOLOGY 154, 1045-1058.
Kulke, M., et al., 2001. Kettin, a major source of myofibrillar stiffness in Drosophila indirect flight muscle. JOURNAL OF CELL BIOLOGY, 154(5), p 1045-1058.
M. Kulke, et al., “Kettin, a major source of myofibrillar stiffness in Drosophila indirect flight muscle”, JOURNAL OF CELL BIOLOGY, vol. 154, 2001, pp. 1045-1058.
Kulke, M., Neagoe, C., Kolmerer, B., Minajeva, A., Hinssen, H., Bullard, B., Linke, W.A.: Kettin, a major source of myofibrillar stiffness in Drosophila indirect flight muscle. JOURNAL OF CELL BIOLOGY. 154, 1045-1058 (2001).
Kulke, M, Neagoe, C, Kolmerer, B, Minajeva, A, Hinssen, Horst, Bullard, B, and Linke, WA. “Kettin, a major source of myofibrillar stiffness in Drosophila indirect flight muscle”. JOURNAL OF CELL BIOLOGY 154.5 (2001): 1045-1058.

44 Zitationen in Europe PMC

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