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α-Aminobutyric acid (AABA), also known as homoalanine in biochemistry, is a non-proteinogenic alpha amino acid with chemical formula C 4 H 9 NO 2. The straight two carbon side chain is one carbon longer than alanine, hence the prefix homo-. Homoalanine is biosynthesised by transaminating oxobutyrate, a metabolite in isoleucine biosynthesis.
β-Aminobutyric acid (BABA) is an isomer of the amino acid aminobutyric acid with the chemical formula C 4 H 9 NO 2.It has two isomers, α-aminobutyric acid and γ-aminobutyric acid (GABA), a neurotransmitter in animals that is also found in plants, where it may play a role in signalling.
The pK a values for deprotonation of the common amino acids span the approximate range 2.15 ± 0.2. This is also consistent with the zwitterion being the predominant isomer that is present in an aqueous solution. For comparison, the simple carboxylic acid propionic acid (CH 3 CH 2 CO 2 H) has a pK a value of 4.88.
Aminobutyric acid or aminobutanoic acid may refer to any of three isomeric chemical compounds: α-Aminobutyric acid (AABA) β-Aminobutyric acid (BABA)
The following other wikis use this file: Usage on af.wikipedia.org Zwitterioon; Usage on bs.wikipedia.org Dvopolarizirani ion; Usage on ca.wikipedia.org
Threonine (symbol Thr or T) [2] is an amino acid that is used in the biosynthesis of proteins.It contains an α-amino group (which is in the protonated −NH + 3 form when dissolved in water), a carboxyl group (which is in the deprotonated −COO − form when dissolved in water), and a side chain containing a hydroxyl group, making it a polar, uncharged amino acid.
For example, residue i may form hydrogen bonds to residues j − 1 and j + 1; this is known as a wide pair of hydrogen bonds. By contrast, residue j may hydrogen-bond to different residues altogether, or to none at all. The hydrogen bond arrangement in parallel beta sheet resembles that in an amide ring motif with 11 atoms.
Homocystine is the organosulfur compound with the formula (HO 2 CCH(NH 2)CH 2 CH 2 S) 2. It is disulfide derived from oxidation of homocysteine . [ 2 ] Its relationship with homocysteine is analogous to the relationship between cystine and cysteine .