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1lzv

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[[Image:1lzv.jpg|left|200px]]
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{{Seed}}
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{{STRUCTURE_1lzv| PDB=1lzv | SCENE= }}
{{STRUCTURE_1lzv| PDB=1lzv | SCENE= }}
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'''Site-Specific Mutant (Tyr7 replaced with His) of Human Carbonic Anhydrase II'''
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===Site-Specific Mutant (Tyr7 replaced with His) of Human Carbonic Anhydrase II===
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==Overview==
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We have prepared a site-specific mutant of human carbonic anhydrase (HCA) II with histidine residues at positions 7 and 64 in the active site cavity. Using a different isozyme, we have placed histidine residues in HCA III at positions 64 and 67 and in another mutant at positions 64 and 7. Each of these histidine residues can act as a proton transfer group in catalysis when it is the only nonliganding histidine in the active site cavity, except His(7) in HCA III. Using an (18)O exchange method to measure rate constants for intramolecular proton transfer, we have found that inserting two histidine residues into the active site cavity of either isozyme II or III of carbonic anhydrase results in rates of proton transfer to the zinc-bound hydroxide that are antagonistic or suppressive with respect to the corresponding single mutants. The crystal structure of Y7H HCA II, which contains both His(7) and His(64) within the active site cavity, shows the conformation of the side chain of His(64) moved from its position in the wild type and hydrogen-bonded through an intervening water molecule with the side chain of His(7). This suggests a cause of decreased proton transfer in catalysis.
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(as it appears on PubMed at http://www.pubmed.gov), where 12171926 is the PubMed ID number.
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{{ABSTRACT_PUBMED_12171926}}
==About this Structure==
==About this Structure==
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[[Category: Twisted beta sheet]]
[[Category: Twisted beta sheet]]
[[Category: Zinc metalloenzyme]]
[[Category: Zinc metalloenzyme]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 00:27:42 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Wed Jul 2 22:54:17 2008''

Revision as of 19:54, 2 July 2008

Image:1lzv.png

Template:STRUCTURE 1lzv

Site-Specific Mutant (Tyr7 replaced with His) of Human Carbonic Anhydrase II

Template:ABSTRACT PUBMED 12171926

About this Structure

1LZV is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.

Reference

Kinetic analysis of multiple proton shuttles in the active site of human carbonic anhydrase., Tu C, Qian M, An H, Wadhwa NR, Duda D, Yoshioka C, Pathak Y, McKenna R, Laipis PJ, Silverman DN, J Biol Chem. 2002 Oct 11;277(41):38870-6. Epub 2002 Aug 8. PMID:12171926

Page seeded by OCA on Wed Jul 2 22:54:17 2008

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