1gn6: Difference between revisions

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[[Image:1gn6.jpg|left|200px]]
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[[Image:1gn6.png|left|200px]]


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{{STRUCTURE_1gn6|  PDB=1gn6  |  SCENE=  }}  
{{STRUCTURE_1gn6|  PDB=1gn6  |  SCENE=  }}  


'''G152A MUTANT OF MYCOBACTERIUM TUBERCULOSIS IRON-SUPEROXIDE DISMUTASE.'''
===G152A MUTANT OF MYCOBACTERIUM TUBERCULOSIS IRON-SUPEROXIDE DISMUTASE.===




==Overview==
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We have refined the X-ray structure of a site-directed G152A mutant of the iron-dependent superoxide dismutase from Mycobacterium tuberculosis at 2.9 angstroms resolution. The mutation which replaces a glycine residue in a surface loop with alanine was designed to alter the conformation of this loop region which has previously been shown to play a crucial structural role in quaternary interactions within the SOD tetramer. Gly-152 was targeted as it has dihedral angles (phi = 83.1 degrees, psi = -0.3 degrees) close to the left-handed alpha-helical conformation which is rarely adopted by other amino acids except asparagine. Gly-152 was replaced by alanine as it has similar size and polarity, yet has a very low tendency to adopt similar conformations. X-ray data collection on crystals of this mutant at 2.9 angstroms resolution and subsequent least-squares refinement to an R-value of 0.169 clearly establish that the loop conformation is unaffected. Fluorescence studies of guanidine hydrochloride denaturation establish that the mutant is 4 kcal/mol less stable than the wild-type enzyme. Our results indicate that strict conformational constraints imposed upon a region of polypeptide, due for example to interactions with a neighbouring subunit, may force an alanine residue to adopt this sterically hindered conformation with a consequent reduction in stability of the folded conformation.
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{{ABSTRACT_PUBMED_8674528}}


==About this Structure==
==About this Structure==
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[[Category: Zhang, Y.]]
[[Category: Zhang, Y.]]
[[Category: Oxidoreductase]]
[[Category: Oxidoreductase]]
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 17:46:14 2008''
 
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 1 05:32:40 2008''

Revision as of 02:32, 1 July 2008

File:1gn6.png

Template:STRUCTURE 1gn6

G152A MUTANT OF MYCOBACTERIUM TUBERCULOSIS IRON-SUPEROXIDE DISMUTASE.

Template:ABSTRACT PUBMED 8674528

About this Structure

1GN6 is a Single protein structure of sequence from Mycobacterium tuberculosis. Full crystallographic information is available from OCA.

Reference

X-ray structure analysis of an engineered Fe-superoxide dismutase Gly-Ala mutant with significantly reduced stability to denaturant., Cooper JB, Saward S, Erskine PT, Badasso MO, Wood SP, Zhang Y, Young D, FEBS Lett. 1996 Jun 3;387(2-3):105-8. PMID:8674528

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