1qii: Difference between revisions

Revision as of 06:18, 3 May 2008

SPECIFIC CHEMICAL AND STRUCTURAL DAMAGE AT NINE TIME POINTS (POINT F) CAUSED BY INTENSE SYNCHROTRON RADIATION TO TORPEDO CALIFORNICA ACETYLCHOLINESTERASE

OverviewOverview

Radiation damage is an inherent problem in x-ray crystallography. It usually is presumed to be nonspecific and manifested as a gradual decay in the overall quality of data obtained for a given crystal as data collection proceeds. Based on third-generation synchrotron x-ray data, collected at cryogenic temperatures, we show for the enzymes Torpedo californica acetylcholinesterase and hen egg white lysozyme that synchrotron radiation also can cause highly specific damage. Disulfide bridges break, and carboxyl groups of acidic residues lose their definition. Highly exposed carboxyls, and those in the active site of both enzymes, appear particularly susceptible. The catalytic triad residue, His-440, in acetylcholinesterase, also appears to be much more sensitive to radiation damage than other histidine residues. Our findings have direct practical implications for routine x-ray data collection at high-energy synchrotron sources. Furthermore, they provide a direct approach for studying the radiation chemistry of proteins and nucleic acids at a detailed, structural level and also may yield information concerning putative "weak links" in a given biological macromolecule, which may be of structural and functional significance.

About this StructureAbout this Structure

1QII is a Single protein structure of sequence from Torpedo californica. Full crystallographic information is available from OCA.

ReferenceReference

Specific chemical and structural damage to proteins produced by synchrotron radiation., Weik M, Ravelli RB, Kryger G, McSweeney S, Raves ML, Harel M, Gros P, Silman I, Kroon J, Sussman JL, Proc Natl Acad Sci U S A. 2000 Jan 18;97(2):623-8. PMID:10639129 Page seeded by OCA on Sat May 3 06:18:58 2008

Proteopedia Page Contributors and Editors (what is this?)Proteopedia Page Contributors and Editors (what is this?)

OCA

@@ Line 1: / Line 1: @@
 [[Image:1qii.jpg|left|200px]]
- {{Structure
+<!--
-|PDB= 1qii |SIZE=350|CAPTION= <scene name='initialview01'>1qii</scene>, resolution 2.65&Aring;
+The line below this paragraph, containing "STRUCTURE_1qii", creates the "Structure Box" on the page.
-|SITE= <scene name='pdbsite=CAT:Catalytic+Triad'>CAT</scene>
+You may change the PDB parameter (which sets the PDB file loaded into the applet)
-|LIGAND=
+or the SCENE parameter (which sets the initial scene displayed when the page is loaded),
-|ACTIVITY= <span class='plainlinks'>[http://en.wikipedia.org/wiki/Acetylcholinesterase Acetylcholinesterase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.1.1.7 3.1.1.7] </span>
+or leave the SCENE parameter empty for the default display.
-|GENE=
+-->
-|DOMAIN=
+{{STRUCTURE_1qii|  PDB=1qii  |  SCENE=  }}
-|RELATEDENTRY=[[1qid|1QID]], [[1qie|1QIE]], [[1qif|1QIF]], [[1qig|1QIG]], [[1qih|1QIH]], [[1qii|1QII]], [[1qij|1QIJ]], [[1qik|1QIK]], [[1qim|1QIM]]
-|RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1qii FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1qii OCA], [http://www.ebi.ac.uk/pdbsum/1qii PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=1qii RCSB]</span>
-}}
 '''SPECIFIC CHEMICAL AND STRUCTURAL DAMAGE AT NINE TIME POINTS (POINT F) CAUSED BY INTENSE SYNCHROTRON RADIATION TO TORPEDO CALIFORNICA ACETYLCHOLINESTERASE'''
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 [[Category: Ravelli, R B.G.]]
 [[Category: Weik, M.]]
-[[Category: alpha/beta hydrolase]]
+[[Category: Alpha/beta hydrolase]]
-[[Category: catalytic triad]]
+[[Category: Catalytic triad]]
-[[Category: disulfide bond]]
+[[Category: Disulfide bond]]
-[[Category: glycosylated protein]]
+[[Category: Glycosylated protein]]
-[[Category: neurotransmitter cleavage]]
+[[Category: Neurotransmitter cleavage]]
-[[Category: radiation damage]]
+[[Category: Radiation damage]]
-[[Category: serine hydrolase]]
+[[Category: Serine hydrolase]]
-[[Category: time series]]
+[[Category: Time series]]
+''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May  3 06:18:58 2008''
-''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Mar 30 23:14:04 2008''