Warning: imagejpeg(C:\Inetpub\vhosts\kidney.de\httpdocs\phplern\26113821
.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Front+Physiol
2015 ; 6
(ä): 174
Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
A new paradigm for muscle contraction
#MMPMID26113821
Herzog W
; Powers K
; Johnston K
; Duvall M
Front Physiol
2015[]; 6
(ä): 174
PMID26113821
show ga
For the past 60 years, muscle contraction had been thought to be governed
exclusively by the contractile filaments, actin, and myosin. This thinking
explained most observations for concentric and isometric, but not for eccentric
muscle contractions. Just over a decade ago, we discovered that eccentric
contractions were associated with a force that could not be assigned to actin and
myosin, but was at least in part associated with the filamentous protein titin.
Titin was found to bind calcium upon activation, thereby increasing its
structural stability, and thus its stiffness and force. Furthermore, there is
increasing evidence that the proximal part of titin binds to actin in an
activation- and force-dependent manner, thereby shortening its free length, thus
increasing its stiffness and force. Therefore, we propose that muscle contraction
involves three filaments, actin, myosin and titin, and that titin regulates force
by binding calcium and by shortening its spring length by binding to actin.