Actin-titin interaction in cardiac myofibrils: Probing a physiological role

Linke WA, Ivemeyer M, Labeit S, Hinssen H, Ruegg JC, Gautel M (1997)
BIOPHYSICAL JOURNAL 73(2): 905-919.

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Abstract
The high stiffness of relaxed cardiac myofibrils is explainable mainly by the expression of a short-length titin (connectin), the giant elastic protein of the vertebrate myofibrillar cytoskeleton. However, additional molecular features could account for this high stiffness, such as interaction between titin and actin, which has previously been reported in vitro. To probe this finding for a possible physiological significance, isolated myofibrils from rat heart were subjected to selective removal of actin filaments by a calcium-independent gelsolin fragment, and the ''passive'' stiffness of the specimens was recorded. Upon actin extraction, stiffness decreased by nearly 60%, and to a similar degree after high-salt extraction of thick filaments. Thus actin-titin association indeed contributes to the stiffness of resting cardiac muscle. To identify possible sites of association, we employed a combination of different techniques. Immunofluorescence microscopy revealed that actin extraction increased the extensibility of the previously stiff Z-disc-flanking titin region. Actin-titin interaction within this region was confirmed in in vitro cosedimentation assays, in which multimodule recombinant titin fragments were tested for their ability to interact with F-actin. By contrast, such assays showed no actin-titin-binding propensity for sarcomeric regions outside the Z-disc comb. Accordingly, the results of mechanical measurements demonstrated that competition with native titin by recombinant titin fragments from Z-disc-remote, I-band or A-band regions did not affect passive myofibril stiffness. These results indicate that it is actin-titin association near the Z-disc, but not along the remainder of the sarcomere, that helps to anchor the titin molecule at its N-terminus and maintain a high stiffness of the relaxed cardiac myofibril.
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Linke WA, Ivemeyer M, Labeit S, Hinssen H, Ruegg JC, Gautel M. Actin-titin interaction in cardiac myofibrils: Probing a physiological role. BIOPHYSICAL JOURNAL. 1997;73(2):905-919.
Linke, W. A., Ivemeyer, M., Labeit, S., Hinssen, H., Ruegg, J. C., & Gautel, M. (1997). Actin-titin interaction in cardiac myofibrils: Probing a physiological role. BIOPHYSICAL JOURNAL, 73(2), 905-919. doi:10.1016/S0006-3495(97)78123-2
Linke, W. A., Ivemeyer, M., Labeit, S., Hinssen, H., Ruegg, J. C., and Gautel, M. (1997). Actin-titin interaction in cardiac myofibrils: Probing a physiological role. BIOPHYSICAL JOURNAL 73, 905-919.
Linke, W.A., et al., 1997. Actin-titin interaction in cardiac myofibrils: Probing a physiological role. BIOPHYSICAL JOURNAL, 73(2), p 905-919.
W.A. Linke, et al., “Actin-titin interaction in cardiac myofibrils: Probing a physiological role”, BIOPHYSICAL JOURNAL, vol. 73, 1997, pp. 905-919.
Linke, W.A., Ivemeyer, M., Labeit, S., Hinssen, H., Ruegg, J.C., Gautel, M.: Actin-titin interaction in cardiac myofibrils: Probing a physiological role. BIOPHYSICAL JOURNAL. 73, 905-919 (1997).
Linke, WA, Ivemeyer, M, Labeit, S, Hinssen, Horst, Ruegg, JC, and Gautel, M. “Actin-titin interaction in cardiac myofibrils: Probing a physiological role”. BIOPHYSICAL JOURNAL 73.2 (1997): 905-919.
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