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Chapter 4: Q19. (page 95)

Some bacteria produce poly-γ-glutamic acid, a polymer in which the amino group of each glutamate residue is condensed with the γ-carboxylate group of the adjacent residue. Draw the repeating structure of this polymer.

Short Answer

Expert verified

Poly-γ-glutamic acid is a biopolymer formed by the repeating units of either L-Glutamic acid or D-Glutamic acid or both.It is formed during bacterial fermentation.

Step by step solution

01

Poly-γ-glutamic acid

Poly-γ-glutamic acid is a biopolymer formed by the repeating units of either L-Glutamic acid or D-Glutamic acid or both.It is formed during bacterial fermentation.

02

Formation of poly-γ-glutamic acid

The peptide bond formation in between the amino group of one glutamic acid with the carboxyl group of the second glutamic acid results in the formation of the poly-γ-glutamic acid.

03

Chemical Structure of poly-γ-glutamic acid

Thus, structure of the poly-γ-glutamic acid was drawn.

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Most popular questions from this chapter

Cover the labels in Figs. 4-14 and 4-15 and identify each parent amino acid and the type of chemical modification that has occurred.

A sample of the amino acid tyrosine is barely soluble in water. Would a polypeptide containing only Tyr residues, poly(Tyr), be more or less soluble, assuming the total number of Tyr groups remains constant?

The twoCαHatoms of Gly are said to be prochiral, because when one of them is replaced by another group,Cα becomes chiral. Draw a Fischer projection of Gly and indicate which H must be replaced withCH3to yield D-Ala.

Identify the amino acids that differ from each other by a single methylor methylene group.

Calculate the plof (a) Ala, (b) His, and (c) Glu.
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