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When lead acts as a poison, it can do so either by replacing another ion (such as zinc) in the active site of an enzyme or by reacting with cysteine side chains to form covalent bonds.

When lead acts as a poison, it can do so either by replacing another ion (such as zinc) in the active site of an enzyme or by reacting with cysteine side chains to form covalent bonds.

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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When lead acts as a poison, it can do so either by replacing another ion (such as zinc) in the active site of an enzyme or by reacting with cysteine side chains to form covalent bonds. Which of these is irreversible and why? Match the items in the left column to the appropriate blanks in the sentences on the right. Reset Help a covalent bond When occurs between the active site (containing cystein) and the inhibitor (lead), replacement of an ion the substrate is excluded or the catalytic reaction is blocked. an ionic bond When occurs and the inhibitor (lead) replaces another ion. reaction with side chains The is an example of a permanent, irreversible change. ion exchange The is an example of a change that can be reversed.
Transcribed Image Text:When lead acts as a poison, it can do so either by replacing another ion (such as zinc) in the active site of an enzyme or by reacting with cysteine side chains to form covalent bonds. Which of these is irreversible and why? Match the items in the left column to the appropriate blanks in the sentences on the right. Reset Help a covalent bond When occurs between the active site (containing cystein) and the inhibitor (lead), replacement of an ion the substrate is excluded or the catalytic reaction is blocked. an ionic bond When occurs and the inhibitor (lead) replaces another ion. reaction with side chains The is an example of a permanent, irreversible change. ion exchange The is an example of a change that can be reversed.
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