amino acid n (Biochemistry) any of a group of organic compounds containing one or more amino groups, -NH2, and one or more carboxyl groups, -COOH. The alpha-amino acids RCH(NH2)COOH (where R is either hydrogen or an organic group) are the component molecules of proteins; some can be ...
Amino acid, any of a group of organic molecules that consist of a basic amino group, an acidic carboxyl group, and a unique organic side chain. The term amino acid is short for α-amino [alpha-amino] carboxylic acid. Examples of amino acids include glyci
Polar amino acids are glycine, serine, threonine, cysteine, tyrosine, aspartic acid, glutamic acid, asparagine, glutamine, lysine, histidine, and arginine. Nonpolar amino acids are alanine, valine, leucine, isoleucine, methionine, phenylalanine, tryptophan, and proline. ...
Amino Acid STRUCTURE (3D)Physicological pH and Amino Acids: ZWITTERIONSAmino 2、 Acid pKa ValuesAmino Acida-carboxylic acidpKaa-aminopKa=14-pKbSide chainAlanine2.359.87Arginine2.019.0412.48Asparagine2.028.80Aspartic Acid2.109.823.86Cysteine2.0510.258.00Glutamic Acid2.109.474.07Glutamine2.179.13Glycine2.359....
an intermediate of thecitric acid cycle. Six of the nonessential amino acids (arginine, cysteine, glutamine, glycine, proline, and tyrosine) are consideredconditionally essentialas dietary supplementation may be required during the course of an illness or in children. Amino acids that can not be ...
aminoacid氨基酸structuresphysicologicalionizable Amino Acid Structures The following amino acid structures are listed in alphabetical order. Ionizable groups are shown in their neutral form - this implies absolutely nothing about the predominant form at any particular pH. Amino Acid STRUCTURE (3D) Physic...
It functions as a helix breaker in the secondary structure of proteins (see later discussion). It is also hydroxylated to hydroxyproline after incorporation into collagen (requires ascorbic acid). • Phenylalanine, tyrosine, and tryptophan are aromatic amino acids. Phenylalanine is increased in the...
Amino acid - Building Blocks, Structure, Functions: One of the most useful manners by which to classify the standard (or common) amino acids is based on the polarity (that is, the distribution of electric charge) of the R group (e.g., side chain). Grou
• Aspartic acid • Cysteine • Glutamic acid • Glutamine • Proline • Glycine • Tyrosine • Serine Anadditional amino acids' classificationdepends upon the side chain structure, and experts recognize these five as: • Cysteine and Methionine (amino acids containing sulfur) ...
Tyrosine Tyr Y 181Da Valine Val V 117Da The average molecular weight of an amino acid is 110Da. Dalton (Da) is an alternate name for the atomic mass unit, and kilodalton (kDa) is 1,000 daltons. Thus a protein with a mass of 64kDa has a molecular weight of 64,000 grams per mole...