Sandbox Reserved 772: Difference between revisions

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<Structure load='1K75' size='500' frame='true' align='right' caption='Crystal structure of L-histidinol dehydrogenase with a functional homodimer in the asymmetric unit.' scene='x'/>
<Structure load='1k75' size='500' frame='true' align='right' caption='Crystal structure of L-histidinol dehydrogenase with a functional homodimer in the asymmetric unit.' />




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[[Image:pathways.jpg]]
[[Image:pathways.jpg]]


This bifunctional enzyme converts L-histidinol to L-histidine through a L-histidinaldehyde intermediate. His-327 is the active site and Glu-326 activates water molecule
This bifunctional enzyme converts L-histidinol to L-histidine through a L-histidinaldehyde intermediate. His-327 and Glu-326 are the active sites (proton acceptors) of HDH.<ref name="info">http://www.uniprot.org/uniprot/P06988#section_terms</ref> 


The reaction above is catalyzed by HisD.  The structure allows thebidentification of residues Glu-326 as being base B2 and His-327 as B1, B3, and B4. Glu-326 activates the water molecule that attacks the reactive carbon in step 2 of the reaction mechanism.<ref name="pnas">http://www.pnas.org.prox.lib.ncsu.edu/content/99/4/1859.full.pdf</ref>
The reaction above is catalyzed by HisD.  The structure allows thebidentification of residues Glu-326 as being base B2 and His-327 as B1, B3, and B4. Glu-326 activates the water molecule that attacks the reactive carbon in step 2 of the reaction mechanism.<ref name="pnas">http://www.pnas.org.prox.lib.ncsu.edu/content/99/4/1859.full.pdf</ref>