The relationship between ( R )-cysteine and ( S )-alanine is to be stated. If ( R )-cysteine and ( S )-alanine have opposite three dimensional configurations or the same configuration is to be predicted. Concept introduction: The biopolymers of α -amino acids are called as proteins. The α -amino acids are those amino acids in which amino groups are bonded to α -carbon atoms, next to the carbonyl group. Cahn-Ingold-Prelog rules also referred as CIP rules are used in organic chemistry for naming stereoisomer of a molecule. It assigns R/S notation for stereo center or Z/E notation for each double bond to specify the exact configuration of the molecule.

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Chapter 24.2A, Problem 24.2P

SUB-PART

(a)

Interpretation Introduction

Interpretation:

The relationship between (R)-cysteine and (S)-alanine is to be stated. If (R)-cysteine and (S)-alanine have opposite three dimensional configurations or the same configuration is to be predicted.

Concept introduction:

The biopolymers of α-amino acids are called as proteins. The α-amino acids are those amino acids in which amino groups are bonded to α-carbon atoms, next to the carbonyl group.

Cahn-Ingold-Prelog rules also referred as CIP rules are used in organic chemistry for naming stereoisomer of a molecule. It assigns R/S notation for stereo center or Z/E notation for each double bond to specify the exact configuration of the molecule.

(b)

Interpretation Introduction

Interpretation:

If (R)-cysteine is a D-amino acid or an L-amino acid is to be identified.

Concept introduction:

The biopolymers of α-amino acids are called as proteins. The α-amino acids are those amino acids in which amino groups are bonded to α-carbon atoms, next to the carbonyl group.

Cahn-Ingold-Prelog rules also referred as CIP rules are used in organic chemistry for naming stereoisomer of a molecule. It assigns R/S notation for stereo center or Z/E notation for each double bond to specify the exact configuration of the molecule.

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Most naturally occurring amino acids have chiral centers (the asymmetric a carbon atoms)that are named (S) by the Cahn–Ingold–Prelog convention (Section 5-3). The commonnaturally occurring form of cysteine has a chiral center that is named (R), however.(a) What is the relationship between (R)-cysteine and (S)-alanine? Do they have the oppositethree-dimensional configuration (as the names might suggest) or the same configuration?(b) (S)-Alanine is an l-amino acid (Figure 24-2). Is (R)-cysteine a d-amino acid or anl-amino acid?

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