Glycine Gly

It is a peptide containing 27 amino acid residues containing the amino acids L-histidine (His) L-aspartic acid (Asp) L-serine (Ser) glycine (Gly) L-threonine (Thr) L-phenyl-alanine (Phe) L-glutamic acid (Glu) L-glutamine [Glu(NHj)] L-leucine (Leu) L-arginine (Arg) L-alanine (Ala) and L-valinamide (Va -NHj). 

Two major product ions were observed from the CID of protonated glycylglycine (Gly-Gly)H+ at low kinetic energies 10 eV (CM). These were the immonium ion NH2CH a, and the protonated glycine (Gly)H+ which is the y, ion. The a, ion is... 

For all other amino acids, with the exception of glycine (Gly), the a-carbon is bonded to four different groups, and the two stereoisomers are mirror images that cannot be superimposed. Eukaryotic proteins are always composed of L-amino acids although D-amino acids are found in certain peptide antibiotics and some peptides of bacterial cell walls. ° ° The physical properties of amino acids are influenced by the degree of ionization at different pH values. 

Glycine (Gly or G) (aminoacetic acid, aminoethanoic acid) is a nonpolar, neutral, aliphatic amino acid with the formula HOOCCH(NH2)H. Gly is the simplest amino acid and plays important roles in peptide and protein chains. It does not contain a side chain and can thus fit into secondary structures where larger amino acids cannot. Gly acts as a transmitter in the CNS where it accomplishes several functions. Gly is a precursor of porphyrins. Gly, Pro, aspartate, Ser, and Asn enable reverse turns. The acylated amino group of Gly can accept a second acyl group to give rise to a diacylamide. ... 

The parent molecule of the group is glycine (gly-seen) H2N—CH2—COOH. In addition to the amino group and the carboxylic acid group, the a carbon atom is bonded to two hydrogen atoms. These are the simplest possible substituents. Thus, glycine is the simplest possible a-amino acid and is a very common constituent of proteins ... 

Collagen is the quantitatively most important protein in mammals, making up about 25% of the total protein. There are many different types of collagen, particularly in connective tissue. Collagen has an unusual amino acid composition. Approximately one-third of the amino acids are glycine (Gly), about 10% proline (Pro), and 10% hydroxyproline (Hyp). The... 

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