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Optical rotation, also known as polarization rotation or circular birefringence, is the rotation of the orientation of the plane of polarization about the optical axis of linearly polarized light as it travels through certain materials. Circular birefringence and circular dichroism are the manifestations of optical activity.
Optogenetics. Optogenetics is a biological technique to control the activity of neurons or other cell types with light. This is achieved by expression of light-sensitive ion channels, pumps or enzymes specifically in the target cells. On the level of individual cells, light-activated enzymes and transcription factors allow precise control of ...
An example of a protein that displays different function in different oligomeric states is pyruvate kinase which exhibits metabolic activity as a tetramer and thyroid hormone–binding activity as a monomer. Changes in the concentrations of ligands or substrates may cause a switch in a protein's function.
[1] [12] [13] These linoleic acid-derived leukotoxin and isoleukotoxin sets of optical isomers possess activities similar to those of other molecules called leukotoxins, such as the pore-forming leukotoxin family of RTX toxin virulence factor proteins secreted by gram-negative bacteria, e.g. Aggregatibacter actinomycetemcomitans and Escherichia ...
The technique allows one to measure folding rates at single-molecule level; for example, optical tweezers have been recently applied to study folding and unfolding of proteins involved in blood coagulation. von Willebrand factor (vWF) is a protein with an essential role in blood clot formation process. It discovered – using single molecule ...
The blue-light sensitive ChR2 and the yellow light-activated chloride pump halorhodopsin together enable multiple-color optical activation and silencing of neural activity. [ 64 ] [ 65 ] Another interesting pair is the blue-light sensitive chloride channel Gt ACR2 [ 66 ] and the red-light sensitive cation channel Chrimson [ 67 ] which have been ...
Chirality (chemistry) Two enantiomers of a generic amino acid that are chiral. (S)-Alanine (left) and (R)-alanine (right) in zwitterionic form at neutral pH. In chemistry, a molecule or ion is called chiral (/ ˈkaɪrəl /) if it cannot be superposed on its mirror image by any combination of rotations, translations, and some conformational changes.
Proteins in the Hsp100/Clp family form large hexameric structures with unfoldase activity in the presence of ATP. These proteins are thought to function as chaperones by processively threading client proteins through a small 20 Å (2 nm) pore, thereby giving each client protein a second chance to fold.
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