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Some Cardiomyopathy-Causing Troponin I Mutations Stabilize a Functional Intermediate Actin State
(East Carolina University, 2009-03-18)
We examined four cardiomyopathy-causing mutations of troponin I that appear to disturb function by altering the
distribution of thin filament states. The R193H (mouse) troponin I mutant had greater than normal actin-activated ...
Tropomyosin Dynamics in Cardiac Thin Filaments: A Multisite Förster Resonance Energy Transfer and Anisotropy Study
(East Carolina University, 2008-06)
Cryoelectron microscopy studies have identified distinct locations of tropomyosin (Tm) within the Ca21-free, Ca21-saturated, and myosin-S1-saturated states of the thin filament. On the other hand, steady-state Förster ...
Localization and Characterization of a 7.3-kDa Region of Caldesmon Which Reversibly Inhibits Actomyosin ATPase Activity
(East Carolina University, 1992-08-15)
Cleavage of caldesmon with chymotrypsin yields a series of fragments which bind both calmodulin and actin and inhibit the binding of myosin subfragments to actin and the subsequent stimulation of ATPase activity. Several ...
Fesselin, a Synaptopodin-like Protein, Stimulates Actin Nucleation and Polymerization
(East Carolina University, 2001-11-27)
Fesselin is a proline-rich actin binding protein that has recently been isolated from smooth muscle [Leinweber, B. D., Fredricksen, R. S., Hoffman, D. R., and Chalovich, J. M. (1999) J. Muscle Res. Cell Motil. 20, 539–545]. ...
The Actin Binding Protein, Fesselin, is a Member of the Synaptopodin Family
(East Carolina University, 2008-07)
Fesselin is a natively unfolded protein that is abundant in avian smooth muscle. Like many natively
unfolded proteins, fesselin has multiple binding partners including actin, myosin, calmodulin and
α-actinin. Fesselin ...
Ca2+ and Ionic Strength Dependencies of S1-ADP Binding to Actin-Tropomyosin-Troponin: Regulatory Implications
(East Carolina University, 2004-09)
Skeletal and cardiac muscle contraction are inhibited by the actin-associated complex of tropomyosin-troponin. Binding of Ca21 to troponin or binding of ATP-free myosin to actin reverses this inhibition. Ca21 and ATP-free ...
Calponin interaction with alpha-actinin-actin: evidence for a structural role for calponin.
(East Carolina University, 1999-12)
The purpose of this study was to address the paradox of calponin localization with a-actinin and filamin, two proteins with tandem calponin homology (CH) domains, by determining the effect of these proteins on the binding ...
Kinetics of Binding of Caldesmon to Actin
(East Carolina University, 1995-04-28)
The time course of interaction of caldesmon with actin may be monitored by fluorescence changes that occur upon the binding of 12-(N-methyl-N-(7-nitrobenz-2-oxa-l,3-diazol-4-yl))-labeled caldesmon to actin or to acrylodan ...