Using 1) flash-freezing and 2) large-format MAR imaging plate at beamline 7-1, resolution has been extended to 2.35 E from previous limit of 2.8 E. This 2.8 E data set was obtained from frozen crystals with resolution limited by the smaller MAR imaging plates. Freezing has eliminated the radiation damage plaguing earlier experiments. A wide range of cryosolvents and artificial mother liquors were examined. Replacement of ammonium sulfate/citrate buffer by lithium sulfate/acetate buffer was successful. This artificial mother liquor will be used for heavy atom soaks. After screening low-resolution data in the lab, the promising candidates will be brought to SSRL. The best candidate to date is CH3HgCl; single-site Cys mutants will also be utilized (native has no cysteines).

Agency
National Institute of Health (NIH)
Institute
National Center for Research Resources (NCRR)
Type
Biotechnology Resource Grants (P41)
Project #
5P41RR001209-22
Application #
6437479
Study Section
Project Start
2001-03-01
Project End
2002-02-28
Budget Start
Budget End
Support Year
22
Fiscal Year
2001
Total Cost
$143,176
Indirect Cost
Name
Stanford University
Department
Type
DUNS #
800771545
City
Stanford
State
CA
Country
United States
Zip Code
94305
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