1QIM

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

Summary for 1QIM

• Entry DOI: 10.2210/pdb1qim/pdb
• Related: 1QID 1QIE 1QIF 1QIG 1QIH 1QII 1QIJ 1QIK 1QIM
• Descriptor: ACETYLCHOLINESTERASE (2 entities in total)
• Functional Keywords: radiation damage, time series, disulfide bond, serine hydrolase, alpha/beta hydrolase, neurotransmitter cleavage, catalytic triad, glycosylated protein, hydrolase
• Biological source: Torpedo californica (Pacific electric ray)
• Cellular location: Isoform H: Cell membrane; Lipid-anchor, GPI- anchor. Isoform T: Cell membrane; Peripheral membrane protein: P04058
• Total number of polymer chains: 1
• Total formula weight: 60736.52

Authors

Kryger, G.,Weik, M.,Ravelli, R.B.G. (deposition date: 1999-06-14, release date: 2000-01-28, Last modification date: 2023-08-16)

Primary citation

Weik, M.,Ravelli, R.B.,Kryger, G.,McSweeney, S.,Raves, M.L.,Harel, M.,Gros, P.,Silman, I.,Kroon, J.,Sussman, J.L.
Specific chemical and structural damage to proteins produced by synchrotron radiation.
Proc.Natl.Acad.Sci.USA, 97:623-628, 2000

PubMed Abstract: 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.

PubMed: 10639129
DOI: 10.1073/pnas.97.2.623

Experimental method

X-RAY DIFFRACTION (3 Å)