Precise expression patterns of genes in time and space are essential for proper development of multicellular organisms. Dynamic chromatin conformation and spatial organization of the genome constitute a major step in this regulation to modulate developmental outputs. Polycomb repressive complexes (PRCs) mediate stable or flexible gene repression in response to internal and environmental cues. I...

Background The human genome codes for 49 members of the large ABC protein family. Most of them are membrane transporters. The first structures of exporters have been solved in recent years. Although a remarkable achievement, some uncertainty remained with respect to the physiological conformation of the transporter, which seems not to be fully compatible with all biochemical evidence. During cr...

The inhibition of serine proteinases by both synthetic and natural inhibitors has been widely studied. Eglin c is a small thermostable protein isolated from the leech, Hirudo medicinalis. Eglin c is a potent serine proteinase inhibitor. The three-dimensional structure of native eglin and of its complexes with a number of proteinases are known. We here describe the crystal structure of hydrolyse...

Riboflavin (vitamin B2) belongs to a group of respiratory enzymes that occur widely in animals and plants participating in vital oxidation- reduction processes in the body. A computational study was conducted on riboflavin by ArgusLab 4.0.1 to obtain the most active conformation of riboflavin and to analyze its excited-state properties. The best conformation of riboflavin was found to be -199.2...

We propose a parallel hybrid genetic algorithm for flexible protein-protein docking in order to improve the conventional rigid-body models to manipulate protein-protein interactions. The proposed hybrid algorithm is a combination of an evolutionary algorithm with a simulated annealing one, yielding a powerful protein-complex conformation-searching engine. Parallelization of the procedure makes ...

Summary We present an approach for the efficient docking of peptide motifs to their free receptor structures. Using a motif based search, we can retrieve structural fragments from the Protein Data Bank (PDB) that are very similar to the peptide's final, bound conformation. We use a Fast Fourier Transform (FFT) based docking method to quickly perform global rigid body docking of these fragments ...

thermal conformational changes in human serum albumin (hsa) in present with a 10 mm phosphate buffer, at ph=7 have been investigated via circular dichroism (cd) and uv spectroscopic methods. the results indicate that temperature in a range of 25oc to 55oc could induce a reversible conformational change in the structure of hsa. the hsa phase transition corresponds to the physiological and pathol...

Membrane depolarization causes voltage-gated ion channels to transition from a resting/closed conformation to an activated/open conformation. We used voltage-clamp fluorometry to measure protein motion at specific regions of the Shaker Kv channel. This enabled us to construct new structural models of the resting/closed and activated/open states based on the Kv1.2 crystal structure using the Ros...

The seven-membered ring of the title compound, C(15)H(11)ClN(2)O(2), adopts a boat-shaped conformation (with the C atoms of the fused-ring as the stern and the methyl-ene C atom as the prow). The N atoms exists in a trigonal-planar coordination; one of the acetyl-enic H atoms forms a C-H⋯O hydrogen bond to the O atom of an adjacent mol-ecule, generating a linear chain along a body diagonal.

Conformational transitions of double-stranded DNA in different environments have long been studied as vital parts both vitro and vivo processes. In this study, utilizing Fourier transform infrared spectroscopy (FTIR), we provide detailed analysis dynamics A- to B-form thin films hydrated states based on a statistical substantial number spectra band shape (peak fitting) the phosphate (1150–1000 ...