Lysozyme    is    an    enzyme    that    hydrolyzes    bacterial    cell    wall    polysaccharides.        When     this    reaction    is    carried    out    in    the    presence    of    H218O,    it    is    observed    that    there    is     retention    of    configuration    at    the    C1    carbon    of    the    D    site    sugar    as    shown    below:    Would    this    result    suggest    that    the    enzyme    mechanism    involves    the    direct     nucleophilic    attack    of    water    at    C1 or    that    the    enzyme    mechanism    involves     attack    by    a    nucleophilic    amino    acid    side    chain    of    the    enzyme    that    generates    a     transient    covalent    intermediate?

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
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Lysozyme    is    an    enzyme    that    hydrolyzes    bacterial    cell    wall    polysaccharides.        When    
this    reaction    is    carried    out    in    the    presence    of    H218O,    it    is    observed    that    there    is    
retention    of    configuration    at    the    C1    carbon    of    the    D    site    sugar    as    shown    below:

 

 Would    this    result    suggest    that    the    enzyme    mechanism    involves    the    direct    
nucleophilic    attack    of    water    at    C1 or    that    the    enzyme    mechanism    involves    
attack    by    a    nucleophilic    amino    acid    side    chain    of    the    enzyme    that    generates    a    
transient    covalent    intermediate?

D site
D site
18 OH
+
E site
-H₂O
HO
E site
Transcribed Image Text:D site D site 18 OH + E site -H₂O HO E site
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