The dihydropyridine Ca2+ antagonist drugs used in the therapy of cardiovacular disorders inhibit L-type Ca2+ channels by binding to a single high affinity site. Photoaffinity labeling and analysis of mutant Ca2+ channels implicate the IIIS6 and IVS6 segments in high affinity binding. The amino acid residues that are required for high affinity binding of dihydropyridine Ca2+ channel antagonists ...

A cell line established from a patient with acute lymphoblastic leukemia was found to express IL-2 binding sites with a novel, intermediate affinity compared with the characteristic high-affinity IL-2-receptors and low-affinity IL-2 binding sites described previously. Clones were isolated from this cell line that displayed solely this new IL-2-binding protein, and were found to be unreactive wi...

Binding of insulin to islets of Langerhans was studied. It was found that "specific" binding of [125I]insulin ("specific" binding equals total binding minus nonspecific binding) was saturable with respect to time and insulin concentration and depended on the number of incubated islets. Furthermore, bound insulin was displaced by native insulin in a dose-dependent manner. Bound [125I]insulin was...

This study aimed to predict the binding affinity, orientation, and physical interaction between limonene fat mass obesity-associated protein. The mechanism of protein association was explored by molecular docking, a bioinformatic tool. results were compared with reported anti-obesity drug such as orlistat flavonoids. AutoDock Vina tools used for docking PyMol Discovery Studio Visualizer visuali...

alpha-amylase is widely used as an industrial enzyme, and a therapeutic target for which inhibitors are designed. organic solvents are used to dissolve various compounds that would be studied as moderators of alpha-amylases, but they could themselves affect enzyme activity and stability. methanol, ethanol and propanol are simple alcohols that may be commonly used to this end, and their effect h...

One of the many mutations that have occurred in viral genome is V483A mutation, which a part receptor-binding motif present S1 domain spike protein. mutant virus popular North America with 36 cases so far and frequently occurring recent days. This review compares wild-type mutants to analyze certain factors like interaction between host-cell interface, binding affinity, stability, partition ene...

The fibroblast growth factors (FGFs) act through high affinity tyrosine kinase receptors and, in addition, interact with lower affinity receptors that represent cell- or matrix-associated heparan sulfate proteoglycans. These lower affinity receptors modulate the biological activities of FGFs, but the mechanism by which they exert these effects is rather controversial. We have previously shown (...

The properties of the high-affinity single-stranded DNA (ssDNA) binding state of Escherichia coli recA protein have been studied. We find that all of the nucleoside triphosphates that are hydrolyzed by recA protein induce a high-affinity ssDNA binding state. The effect of ATP binding to recA protein was partially separated from the ATP hydrolytic event by substituting calcium chloride for magne...

The single mutation effect on the binding affinity of H3N2 viral protein hemagglutinin (HA) with the monoclonical antibody fragment (Fab) is studied in this paper using the free energy perturbation (FEP) simulations. An all-atom protein model with explicit solvents is used to perform an aggregate of several microsecond FEP molecular dynamics simulations. A recent experiment shows that a single ...

The affinity of the sarcoplasmic reticulum transport ATPase for calcium and ATP is not affected by lipid deprivation while vanadate binding is completely abolished. Lipid substitution restores vanadate binding as well as the vanadate induced disappearance of the enzyme's high affinity calcium and nucleotide binding sites. Nucleotide binding is simultaneously restored with the displacement of va...