1l34

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{{STRUCTURE_1l34| PDB=1l34 | SCENE= }}
{{STRUCTURE_1l34| PDB=1l34 | SCENE= }}
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'''HIGH-RESOLUTION STRUCTURE OF THE TEMPERATURE-SENSITIVE MUTANT OF PHAGE LYSOZYME, ARG 96 (RIGHT ARROW) HIS'''
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===HIGH-RESOLUTION STRUCTURE OF THE TEMPERATURE-SENSITIVE MUTANT OF PHAGE LYSOZYME, ARG 96 (RIGHT ARROW) HIS===
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==Overview==
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The structure of the temperature-sensitive mutant lysozyme of bacteriophage T4 in which arginine 96 is replaced by histidine has been determined crystallographically and refined to a residual of 17.6% at 1.9-A resolution. Overall, the three-dimensional structure of the mutant protein is extremely similar to that of wild type. There are local distortions in the mutant structure suggesting that the substituted His 96 residue is under strain. This appears to be one of the major reasons for the decreased thermostability. In wild-type lysozyme the guanidinium of Arg 96 is located at the carboxy terminus of alpha-helix 82-90 and makes a pair of hydrogen bonds to two of the carbonyl groups in the last turn of the helix. The loss of this "helix dipole" interaction also appears to contribute to the destabilization. The pKa* of His 96 in the mutant lysozyme has been determined by nuclear magnetic resonance and found to be 6.8 at 10 degrees C. This relatively normal value of the histidine pKa* suggests that the protonated and unprotonated forms of the imidazole ring are perturbed equally by the protein environment or, what is equivalent, the mutant lysozyme is equally stable with either histidine species.
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(as it appears on PubMed at http://www.pubmed.gov), where 2665808 is the PubMed ID number.
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{{ABSTRACT_PUBMED_2665808}}
==About this Structure==
==About this Structure==
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[[Category: Matthews, B W.]]
[[Category: Matthews, B W.]]
[[Category: Weaver, L H.]]
[[Category: Weaver, L H.]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Wed Jul 2 11:35:46 2008''

Revision as of 08:35, 2 July 2008

Image:1l34.png

Template:STRUCTURE 1l34

HIGH-RESOLUTION STRUCTURE OF THE TEMPERATURE-SENSITIVE MUTANT OF PHAGE LYSOZYME, ARG 96 (RIGHT ARROW) HIS

Template:ABSTRACT PUBMED 2665808

About this Structure

1L34 is a Single protein structure of sequence from Enterobacteria phage t4. Full crystallographic information is available from OCA.

Reference

High-resolution structure of the temperature-sensitive mutant of phage lysozyme, Arg 96----His., Weaver LH, Gray TM, Grutter MG, Anderson DE, Wozniak JA, Dahlquist FW, Matthews BW, Biochemistry. 1989 May 2;28(9):3793-7. PMID:2665808

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