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Amino acid 3- and 1-letter symbols Side chain Hydropathy index [50] Molar absorptivity [51] Molecular mass Abundance in proteins (%) [52] Standard genetic coding, IUPAC notation; 3 1 Class Chemical polarity [53] Net charge at pH 7.4 [53] Wavelength, λ max (nm) Coefficient ε (mM −1 ·cm −1) Alanine: Ala A Aliphatic Nonpolar Neutral 1.8 89. ...
Protein sequence is typically notated as a string of letters, listing the amino acids starting at the amino-terminal end through to the carboxyl-terminal end. Either a three letter code or single letter code can be used to represent the 22 naturally encoded amino acids, as well as mixtures or ambiguous amino acids (similar to nucleic acid ...
Selenocysteine (symbol Sec or U, [4] in older publications also as Se-Cys) [5] is the 21st proteinogenic amino acid. Selenoproteins contain selenocysteine residues. Selenocysteine is an analogue of the more common cysteine with selenium in place of the sulfur .
With some exceptions, [1] a three-nucleotide codon in a nucleic acid sequence specifies a single amino acid. The vast majority of genes are encoded with a single scheme (see the RNA codon table ). That scheme is often called the canonical or standard genetic code, or simply the genetic code, though variant codes (such as in mitochondria ) exist.
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The table below lists the abundance of amino acids in E.coli cells and the metabolic cost (ATP) for synthesis of the amino acids. Negative numbers indicate the metabolic processes are energy favorable and do not cost net ATP of the cell. [12] The abundance of amino acids includes amino acids in free form and in polymerization form (proteins).