Parameters affecting the X-ray dose absorbed by macromolecular crystals

The lifetime of a macromolecular crystal in an X-ray beam is assumed to be limited by the absorbed dose. This dose, expressed in Gray (Gy = J kg(-1)), is a function of a number of parameters: the absorption coefficients of the constituent atoms of the crystal, the number of molecules per asymmetric...

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Veröffentlicht in:Journal of synchrotron radiation. - 1994. - 12(2005), Pt 3 vom: 20. Mai, Seite 268-75
1. Verfasser: Murray, James W (VerfasserIn)
Weitere Verfasser: Rudiño-Piñera, Enrique, Owen, Robin Leslie, Grininger, Martin, Ravelli, Raimond B G, Garman, Elspeth F
Format: Aufsatz
Sprache:English
Veröffentlicht: 2005
Zugriff auf das übergeordnete Werk:Journal of synchrotron radiation
Schlagworte:Journal Article Research Support, Non-U.S. Gov't Archaeal Proteins Bacterial Proteins Chromosomal Proteins, Non-Histone Macromolecular Substances Proteins Transcription Factors
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520 |a The lifetime of a macromolecular crystal in an X-ray beam is assumed to be limited by the absorbed dose. This dose, expressed in Gray (Gy = J kg(-1)), is a function of a number of parameters: the absorption coefficients of the constituent atoms of the crystal, the number of molecules per asymmetric unit, the beam energy, flux, size and profile, the crystal size, and the total irradiation time. The effects of these variables on the predicted absorbed dose, calculated using the program RADDOSE, are discussed and are illustrated with reference to the irradiation of a selenomethionine protein crystal of unknown structure. The results of RADDOSE can and will in the future be used to inform the data collection procedure as it sets a theoretical upper limit on the total exposure time at a certain X-ray source. However, as illustrated with an example for which the experimental data are compared with prediction, the actual lifetime of a crystal could become shorter in those cases where specific damage breaks down crucial crystal contacts 
650 4 |a Journal Article 
650 4 |a Research Support, Non-U.S. Gov't 
650 7 |a Archaeal Proteins  |2 NLM 
650 7 |a Bacterial Proteins  |2 NLM 
650 7 |a Chromosomal Proteins, Non-Histone  |2 NLM 
650 7 |a Macromolecular Substances  |2 NLM 
650 7 |a Proteins  |2 NLM 
650 7 |a Transcription Factors  |2 NLM 
700 1 |a Rudiño-Piñera, Enrique  |e verfasserin  |4 aut 
700 1 |a Owen, Robin Leslie  |e verfasserin  |4 aut 
700 1 |a Grininger, Martin  |e verfasserin  |4 aut 
700 1 |a Ravelli, Raimond B G  |e verfasserin  |4 aut 
700 1 |a Garman, Elspeth F  |e verfasserin  |4 aut 
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