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Isoelectric point. The isoelectric point (pI, pH (I), IEP), is the pH at which a molecule carries no net electrical charge or is electrically neutral in the statistical mean. The standard nomenclature to represent the isoelectric point is pH (I). [1] However, pI is also used. [2] For brevity, this article uses pI.
Amino acid. Structure of a typical L -alpha-amino acid in the "neutral" form. Amino acids are organic compounds that contain both amino and carboxylic acid functional groups. [1] Although over 500 amino acids exist in nature, by far the most important are the 22 α-amino acids incorporated into proteins. [2]
It is a non-essential amino acid with a polar side group. The word "tyrosine" is from the Greek tyrós, meaning cheese, as it was first discovered in 1846 by German chemist Justus von Liebig in the protein casein from cheese. [3][4] It is called tyrosyl when referred to as a functional group or side chain.
Lysine (symbol Lys or K) [2] is an α-amino acid that is a precursor to many proteins.It contains an α-amino group (which is in the protonated −NH + 3 form when dissolved in water), an α-carboxylic acid group (which is in the deprotonated −COO − form when dissolved in water), and a side chain lysyl ((CH 2) 4 NH 2), classifying it as a basic, charged (at physiological pH), aliphatic ...
Glutamine (data page) Glutamine (symbol Gln or Q) [4] is an α-amino acid that is used in the biosynthesis of proteins. Its side chain is similar to that of glutamic acid, except the carboxylic acid group is replaced by an amide. It is classified as a charge-neutral, polar amino acid.
Serine (symbol Ser or S) [3][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), a carboxyl group (which is in the deprotonated − COO−. form under biological conditions), and a side chain consisting of a hydroxymethyl ...
Arginine is the amino acid with the formula (H 2 N) (HN)CN (H) (CH 2) 3 CH (NH 2)CO 2 H. The molecule features a guanidino group appended to a standard amino acid framework. At physiological pH, the carboxylic acid is deprotonated (−CO 2−) and both the amino and guanidino groups are protonated, resulting in a cation.
Isoleucine (symbol Ile or I) [1] 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 hydrocarbon side chain with a branch (a central carbon atom bound to three other ...