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What are the relative percentage (%) of species (B) and (C) at pH 7.2? (Note: treat pka's as written, i.e., no environmental/local A COOH H₂N-C-H CH₂ SH Cysteine pka₁ = 2 B COO™ H₂N-C-H CH₂ I SH Cysteine interaction effects) C COO- H₂N-C-H CH₂ S- Cysteine pkaR = 8.2 pka₂ = 10.3 D COO- H₂N-C-H CH₂ I S- Cysteine

What are the relative percentage (%) of species (B) and (C) at pH 7.2? (Note: treat pka's as written, i.e., no environmental/local A COOH H₂N-C-H CH₂ SH Cysteine pka₁ = 2 B COO™ H₂N-C-H CH₂ I SH Cysteine interaction effects) C COO- H₂N-C-H CH₂ S- Cysteine pkaR = 8.2 pka₂ = 10.3 D COO- H₂N-C-H CH₂ I S- Cysteine

Biochemistry
Biochemistry
9th Edition
ISBN:9781319114671
Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Chapter1: Biochemistry: An Evolving Science
Section: Chapter Questions
Problem 1P
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What are the relative percentage (%) of species (B) and (C) at pH 7.2? (Note: treat pka's as written, i.e., no environmental/local interaction effects) A COOH I H₂N-C-H CH₂ SH Cysteine pka₁ = 2 B COO- I H₂N-C-H CH₂ SH Cysteine C COO I H₂N-C-H pka = 8.2 CH₂ S- Cysteine pka₂ = 10.3 D COO™ H₂N-C-H CH₂ S- Cysteine
Transcribed Image Text:What are the relative percentage (%) of species (B) and (C) at pH 7.2? (Note: treat pka's as written, i.e., no environmental/local interaction effects) A COOH I H₂N-C-H CH₂ SH Cysteine pka₁ = 2 B COO- I H₂N-C-H CH₂ SH Cysteine C COO I H₂N-C-H pka = 8.2 CH₂ S- Cysteine pka₂ = 10.3 D COO™ H₂N-C-H CH₂ S- Cysteine
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Amino acids contain an alpha-amino group, an alpha-carboxylic group, and a side chain. The side chain can be ionizable or non-ionizable. The side-chain of the cysteine amino acid is ionizable and it can act as a weak acid. It means the side chain of cysteine amino acid can donate a proton. 

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