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Alanine is an aliphatic amino acid, because the side-chain connected to the α-carbon atom is a methyl group (-CH 3). Alanine is the simplest α-amino acid after glycine. The methyl side-chain of alanine is non-reactive and is therefore hardly ever directly involved in protein function. [12]
For example, the systematic name of alanine is 2-aminopropanoic acid, based on the formula CH 3 −CH(NH 2)−COOH. The Commission justified this approach as follows: [7] The systematic names and formulas given refer to hypothetical forms in which amino groups are unprotonated and carboxyl groups are undissociated.
Chemical formula: C 3 H 7 N O 2 Molar mass ... ^a EINECS for L-alanine ^a CID 602 from PubChem ^a CID 5950 from PubChem This page was last edited on 12 April 2023, at ...
In this example, alanine is depicted in the zwitterionic form at physiological pH. D-Amino acids are amino acids where the stereogenic carbon alpha to the amino group has the D-configuration. For most naturally-occurring amino acids, this carbon has the L-configuration. D-Amino acids are
β-Alanine (beta-alanine) is a naturally occurring beta amino acid, which is an amino acid in which the amino group is attached to the β-carbon (i.e. the carbon two carbon atoms away from the carboxylate group) instead of the more usual α-carbon for alanine (α-alanine). The IUPAC name for β-alanine is 3-aminopropanoic acid.
Phenylalanine (symbol Phe or F) [3] is an essential α-amino acid with the formula C 9 H 11 NO 2. It can be viewed as a benzyl group substituted for the methyl group of alanine, or a phenyl group in place of a terminal hydrogen of alanine.
This is because the structure of the β-lactam closely resembles the D-ala-D-ala residue. β-Lactams exert their effect by competitively inactivating the serine DD -transpeptidase catalytic site. Penicillin is a cyclic analogue of the D -Ala- D -Ala terminated carbonyl donors, therefore in the presence of this antibiotic, the reaction stops at ...
Each MurNAc is attached to a short (4- to 5-residue) amino acid chain, containing L-alanine, D-glutamic acid, meso-diaminopimelic acid, and D-alanine in the case of Escherichia coli (a gram-negative bacterium); or L-alanine, D-glutamine, L-lysine, and D-alanine with a 5-glycine interbridge between tetrapeptides in the case of Staphylococcus ...