1gd3: Difference between revisions
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[[Image:1gd3.gif|left|200px]] | [[Image:1gd3.gif|left|200px]] | ||
'''refined solution structure of human cystatin A''' | {{Structure | ||
|PDB= 1gd3 |SIZE=350|CAPTION= <scene name='initialview01'>1gd3</scene> | |||
|SITE= | |||
|LIGAND= | |||
|ACTIVITY= | |||
|GENE= | |||
}} | |||
'''refined solution structure of human cystatin A''' | |||
==Overview== | ==Overview== | ||
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==About this Structure== | ==About this Structure== | ||
1GD3 is a [ | 1GD3 is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1GD3 OCA]. | ||
==Reference== | ==Reference== | ||
Structural comparison between wild-type and P25S human cystatin A by NMR spectroscopy. Does this mutation affect the alpha-helix conformation?, Shimba N, Kariya E, Tate S, Kaji H, Kainosho M, J Struct Funct Genomics. 2000;1(1):26-42. PMID:[http:// | Structural comparison between wild-type and P25S human cystatin A by NMR spectroscopy. Does this mutation affect the alpha-helix conformation?, Shimba N, Kariya E, Tate S, Kaji H, Kainosho M, J Struct Funct Genomics. 2000;1(1):26-42. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/12836678 12836678] | ||
[[Category: Homo sapiens]] | [[Category: Homo sapiens]] | ||
[[Category: Single protein]] | [[Category: Single protein]] | ||
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[[Category: Shimba, N.]] | [[Category: Shimba, N.]] | ||
[[Category: Tate, S.]] | [[Category: Tate, S.]] | ||
[[Category: cystatin | [[Category: cystatin some]] | ||
[[Category: thiol protease inhibitor]] | [[Category: thiol protease inhibitor]] | ||
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Mar 20 11:21:34 2008'' | ||
Revision as of 12:21, 20 March 2008
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| Coordinates: | save as pdb, mmCIF, xml | ||||||
refined solution structure of human cystatin A
OverviewOverview
The effect of substituting Pro25, located in the alpha-helical region of the cystatin A structure, with Ser has been studied. The structures of wild type and P25S cystatin A were determined by multidimensional NMR spectroscopy under comparable conditions. These two structures were virtually identical, and the alpha-helix between Glu15-Lys30 exists with uninterrupted continuity, with a slight bend at residue 25. In order to characterize the possible substitution effects of Pro25 with Ser on the alpha-helix, the chemical shifts of the amide nitrogens and protons, the generalized order parameters obtained by the analyses of the 15N-1H relaxation data, the amide proton exchange rates, and the NOE networks among the alpha-helical and surrounding residues were carefully compared. None of these parameters indicated any significant static or dynamic structural differences between the alpha-helical regions of the wild-type and P25S cystatin A proteins. We therefore conclude that our previous structure of the wild-type cystatin A, in which the alpha-helix exhibited a sharp kink at Pro25, must be revised. The asymmetric distribution of hydrophobic interactions between the side-chain residues of the alpha-helix and the rolled beta-sheet surface, as revealed by NOEs, may be responsible for the slight bend of the alpha-helix in both variants and for the destabilized hydrogen bonding of the alpha-helical residues that follow Pro25/Ser25, as evidenced by increased amide exchange rates.
About this StructureAbout this Structure
1GD3 is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.
ReferenceReference
Structural comparison between wild-type and P25S human cystatin A by NMR spectroscopy. Does this mutation affect the alpha-helix conformation?, Shimba N, Kariya E, Tate S, Kaji H, Kainosho M, J Struct Funct Genomics. 2000;1(1):26-42. PMID:12836678
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