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Valine (symbol Val or V) [4] is an α-amino acid that is used in the biosynthesis of proteins. It contains an α-amino group (which is in the protonated −NH 3 + form under biological conditions), an α-carboxylic acid group (which is in the deprotonated −COO − form under biological conditions), and a side chain isopropyl group, making it a non-polar aliphatic amino acid.
The 21 proteinogenic α-amino acids found in eukaryotes, grouped according to their side chains' pK a values and charges carried at physiological pH (7.4) 2- , alpha- , or α-amino acids [ 21 ] have the generic formula H 2 NCHRCOOH in most cases, [ b ] where R is an organic substituent known as a " side chain ".
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The N-terminus is the first part of the protein that exits the ribosome during protein biosynthesis.It often contains signal peptide sequences, "intracellular postal codes" that direct delivery of the protein to the proper organelle.
α-Ketoisovaleric acid is an organic compound with the formula (CH 3) 2 CHC(O)CO 2 H. It is a ketoacid.With a melting point just above room temperature, it is usually an oil or semi-solid.
A tetrapeptide (example: Val-Gly-Ser-Ala) with green highlighted N-terminal α-amino acid (example: L-valine) and blue marked C-terminal α-amino acid (example: L-alanine). The C-terminus (also known as the carboxyl-terminus , carboxy-terminus , C-terminal tail , carboxy tail , C-terminal end , or COOH-terminus ) is the end of an amino acid ...
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KcsA was the first potassium ion channel to be characterized using x-ray crystallography by Roderick MacKinnon and his colleagues in 1998. In the years leading up to this, research on the structure of K + channels was centered on the use of small toxin binding to reveal the location of the pore and selectivity filter among channel residues.