Browsing Biochemistry and Molecular Biology by Submit Date
Now showing items 21-40 of 40
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The delta-14 Mutation of Human Cardiac Troponin T Enhances ATPase Activity and Alters the Cooperative Binding of S1-ADP to Regulated Actin
(East Carolina University, 2004-12-07)The complex of tropomyosin and troponin binds to actin and inhibits activation of myosin ATPase activity and force production of striated muscles at low free Ca2+ concentrations. Ca2+ stimulates ATP activity, and at ... -
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 ... -
The Interaction of Caldesmon with the COOH Terminus of Actin
(East Carolina University, 1991-10-25)Caldesmon interacts with the NH2-terminal region of actin. It is now shown in airfuge centrifugation experiments that modification of the penultimate cysteine residue of actin significantly weakens its binding to caldesmon ... -
Deoxyguanosine-resistant Leukemia L1210 Cells: Loss of Specific Deoxyribonecleoside Kinase Activity
(East Carolina University, 1993-01-05)A mouse leukemia L1210 cell line was selected for resistance to deoxyguanosine. The deoxyguanosine-resistant cells (dGuo-R) were 126-fold less sensitive to deoxyguanosine than the wild-type cells. The IC50 values for araC ... -
Regulation of lipoprotein lipase mRNA content in 3T3-L1 cells by tumour necrosis factor.
(East Carolina University, 1988-02-01)Tumour necrosis factor (TNF) was previously shown to suppress lipoprotein lipase (LPL) synthesis and activity in 3T3-L1 adipocytes. The present study examined the effect ofTNF on amounts ofmRNA for LPL in 3T3-Ll cells. ... -
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]. ... -
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 ... -
Inhibition of contraction and myosin light chain phosphorylation in guinea-pig smooth muscle by p21-activated kinase 1
(East Carolina University, 2003-06-01)The p21-activated protein kinases (PAKs) have been implicated in cytoskeletal rearrangements and modulation of non-muscle contractility. Little, however, is known about the role of the PAK family members in smooth muscle ... -
Characterization of a caldesmon fragment that competes with myosin-ATP binding to actin.
(East Carolina University, 1993-08)The protein caldesmon inhibits actin-activated ATP hydrolysis of myosin and inhibits the binding of myosin*ATP to actin. Afragment isolated from a chymotryptic digest of caldesmon contains features of the intact molecule ... -
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 ... -
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 ... -
Negative Charges at Protein Kinase C Sites of Troponin I Stabilize the Inactive State of Actin
(East Carolina University, 2008-01-15)Alterations in the troponin complex can lead to increases or decreases in contractile activity. Most mutations of troponin that cause hypertrophic cardiomyopathy increase the activity of cardiac muscle fibers. In at least ... -
HuR involvement in mitotic clonal expansion during acquisition of the adipocyte phenotype
(East Carolina University, 2009-05-29)In the nucleus HuR binds to mRNAs containing adenylate-uridylate rich elements in the 3?- untranslated region. HuR may influence expression of its ligand mRNA through regulation of polyadenylation, translocation of the ... -
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 ... -
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 ... -
Post-Transcriptional Regulation of mRNA Metabolism during Differentiation of 3T3-L1 Cells: Role of HuR
(East Carolina University, 2010)Our studies address early control points in the differentiation process that are necessary for expression as well as the maintenance of the adipocyte phenotype. We have focused on the post-transcriptional regulation of ... -
Fesselin and caldesmon: natively unfolded proteins in smooth muscle regulation
(East Carolina University, 2010)Dysregulation of smooth muscle contraction is linked to diseases such as atherosclerosis, asthma, hypertension, urinary incontinence, premature birth and others. The goal of this project is to contribute to our understanding ... -
Multiple Translation Factor eIF4G (IFG-1) Isoforms are Required for the Apoptosome-Dependent Activation of Germ Cell Apoptosis
(East Carolina University, 2010)Apoptosis is a naturally occurring process during animal development required for the programmed killing and removal of injured cells. Cellular insult induces a switch in translation that allows for the rapid synthesis ... -
The Biochemical Characterization Of Neuronal K+ Channel N-Glycans And Their Role In Regulating K+ Channel Function
(East Carolina University, 2009)The Kv3 and Kv1 subfamilies of voltage–gated K+ channels are critical components which contribute to action potential repolarization throughout the central nervous system. Here, it was shown that both absolutely conserved ... -
The Distribution Of Regulated Actomyosin States Is Central To Cardiac Muscle Regulation And Disturbance Of This Distribution Leads To Congenital Cardiomyopathies
(East Carolina University, 2009)Hypertrophic and restrictive cardiomyopathies are congenital cardiac diseases that have an incidence of over one in five hundred and may lead to sudden cardiac death. One of the main impediments to directed treatment is ...