An oligopeptide, 6 amino acids in length, was subjected to acid hydrolysis and yielded equimolar amounts of the following amino acids (in alphabetical order): Arg Gln Lys Met Thr Tyr Based on the following separate treatments, which amino acid is in position #5 of this sequence? a. Cyanogen bromide treatment had no effect. b. Trypsin treatment yielded a dipeptide, a tripeptide and free arginine. The tripeptide had a net positive charge at pH 7. c. Chymotrypsin treatment yielded a dipeptide and a tetrapeptide. The dipeptide had a net charge of zero at pH 5. d. The phenylthiohydantoin derivative released by one round of Edman degradation was PTH-Thr.
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.
An oligopeptide, 6 amino acids in length, was subjected to acid hydrolysis and yielded equimolar amounts of the following amino acids (in alphabetical order):
Arg Gln Lys Met Thr Tyr
Based on the following separate treatments, which amino acid is in position #5 of this
sequence?
a. Cyanogen bromide treatment had no effect.
b. Trypsin treatment yielded a dipeptide, a tripeptide and free arginine. The tripeptide had a net positive charge at pH 7.
c. Chymotrypsin treatment yielded a dipeptide and a tetrapeptide. The dipeptide had a net
charge of zero at pH 5.
d. The phenylthiohydantoin derivative released by one round of Edman degradation was
PTH-Thr.
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