With reference to the following peptide: (a) Identify the N-terminal and C-terminal amino acids. (b) Name the peptide using one-letter abbreviations. (c) Label all the amide bonds in the peptide backbone.
Neutral Amino Acids
Amino acids which do not have any charge on them are neutral amino acids.
Globular Protein
The globular proteins refer to the shape of protein specifically spherical in nature apart from spherical form fibrous, disordered and membrane-bound proteins exist. These globular proteins are miscible in water and form a colloidal solution rather than other types which might not exhibit solubility. Many classes of the fold are found in globular proteins, which render them a sphere shape. Globular fold containing proteins usually are referred to by the term globin.
Dimer
Dimers are basic organic compounds, which are derivates of oligomers. It is formed by the combination of two monomers which could potentially be strong or weak and in most cases covalent or intermolecular in nature. Identical monomers are called homodimer, the non-identical dimers are called heterodimer. The method by which dimers are formed is known as “dimerization”.
Dipeptide
A dipeptide is considered a mixture of two distinct amino acids. Since the amino acids are distinct, based on their composition, two dipeptide's isomers can be produced. Various dipeptides are biologically essential and are therefore crucial to industry.
With reference to the following peptide: (a) Identify the N-terminal and C-terminal amino acids. (b) Name the peptide using one-letter abbreviations. (c) Label all the amide bonds in the peptide backbone.
(a) In the given ball-and-stick model of amino acid, the black balls represent carbon atoms, the white balls represent hydrogen atoms, the blue ball represents nitrogen atom, the yellow ball represent sulfur atom and the red balls represent oxygen atoms.
The amino acid that contains free amine group is labeled as N-terminal amino acid whereas, the amino acid that contains free carboxyl group is labeled as C-terminal amino acid.
(b) The structure of the given peptide shows that it contains Serine, Cysteine, Glutamine and Alanine amino acids attached to each other.
The one-letter abbreviation for Serine, Cysteine, Glutamine and Alanine is S, C, Q and A, respectively. Therefore, the name of peptide by the use of one-letter abbreviation is S-C-Q-A.
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