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Chapter 4: Q6P (page 95)

Calculate the number of possible pentapeptides that contain one residue each ofAla, Gly, His, Lys, and Val.

Short Answer

Expert verified

The number of possible pentapeptides that contain one residue each of Ala, Gly, His, Lys, andVal is 120.

Step by step solution

01

Concept Introduction

Pentapeptide repeats are a type of sequence pattern present in protein molecules in multiple tandem copies.Pentapeptide repeat proteins are found in all organisms, but cyanobacterial genomes have more copies.

02

The number of Pentapeptides

The first residue can be one of the five residues then the second residue can be one of the four, the third residue can be one of the remaining three, the second can be one of the remaining two, and the fifth one is the last residue.

The solution is obtained as N = 5! = 120.

Therefore, the number is obtained as 120 .

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Most popular questions from this chapter

In some proteins, the side chain of serine appears to undergo ionization. Explain why ionization would be facilitated by the presence of an aspartate residue nearby.

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.

Taurine (2-aminoethanesulfonic acid) is sometimes called an amino acid.

(a) Explain why this designation is not valid. (b) From which of the 20 standard amino acids is taurine derived? Describe the chemical change(s) that occurred.

Draw the peptide ATLDAK. (a) Calculate its approximate pI. (b) What is its net charge at pH 7.0?

Identify all the chiral carbons in the amino acids shown in Table 4-1.

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