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Dipeptides containing serine and threonine derived oxazolidines are prepared by reacting side chain unprotected dipeptides containing C-terminal Thr or Ser with dimethoxypropane. The resulting building blocks can be coupled in Fmoc-based solid phase peptid ...
Cell-cycle phase transitions are controlled by cyclin-dependent kinases (Cdks). Key to the regulation of these kinase activities are Cdk inhibitors, proteins that are induced in response to various antiproliferative signals but that can also oscillate duri ...
Interferon-alpha (IFN-alpha)-mediated intracellular signaling is initiated by ligand-induced receptor dimerization, tyrosine phosphorylation of the Tyk2 and Jak1 tyrosine kinases, and subsequent phosphorylation of the Stat1 and Stat2 proteins. The IFN-alph ...
Aerobic chemostat cultures of S. cerevisiae were performed at different diln. rates under energy (glucose) limitation or at various extents of energy excess imposed by a N limitation. Energy excess induced metabolic uncoupling under steady-state conditions ...
The cyclosporins comprise a family of cyclic 11-peptides containing seven N-methylated, hydrophobic amino acids. Cyclosporine A (CsA) representing the major member of this family is widely used as immunosuppressive agent in organ transplantations. The biol ...
Cysteine-dependent aspartic proteases (caspases) are a family of enzymes which play a crucial role in apoptosis. Caspases accumulate in eukaryotic cells in the form of low-activity proenzyme precursors. Proteolytic cleavage of specific sites triggers confo ...
The mitogen-activated protein kinase (MAPK) cascades are ubiquitous in eukaryotic signal transduction, and these pathways are conserved in cells from yeast to mammals. They relay extracellular stimuli from the plasma membrane to targets in the cytoplasm an ...
The fission yeast septation initiation network (SIN) triggers the onset of septum formation and cytokinesis. SIN proteins signal from the spindle pole body (SPB), to which they bind in a cell cycle-dependent manner, via the scaffold proteins sid4p and cdc1 ...
Reversible protein phosphorylation is a major regulation mechanism of fundamental biological processes, not only in eukaryotes but also in bacteria. A growing body of evidence suggests that Ser/Thr phosphorylation play important roles in the physiology and ...
We used classical molecular mechanics (MM) simulations and quantum mechanical (QM) structural relaxations to examine the active site of myosin when bound to ATP. Two conformations of myosin have been determined by x-ray crystallography. In one, there is no ...
