Open AccessConceptual design of novel IP‐conveyor‐belt Weissenberg‐mode data‐collection system with multi‐readers for macromolecular crystallography. A comparison between Galaxy and Super Galaxy
Author(s) -
Sakabe N.,
Sakabe K.,
Sasaki K.
Publication year - 2003
Publication title -
journal of synchrotron radiation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.172
H-Index - 99
ISSN - 1600-5775
DOI - 10.1107/s0909049503024154
Subject(s) - physics , galaxy , radius , astrophysics , optics , computer science , computer security
Galaxy is a Weissenberg‐type high‐speed high‐resolution and highly accurate fully automatic data‐collection system using two cylindrical IP‐cassettes each with a radius of 400 mm and a width of 450 mm. It was originally developed for static three‐dimensional analysis using X‐ray diffraction and was installed on bending‐magnet beamline BL6C at the Photon Factory. It was found, however, that Galaxy was also very useful for time‐resolved protein crystallography on a time scale of minutes. This has prompted us to design a new IP‐conveyor‐belt Weissenberg‐mode data‐collection system called Super Galaxy for time‐resolved crystallography with improved time and crystallographic resolution over that achievable with Galaxy. Super Galaxy was designed with a half‐cylinder‐shaped cassette with a radius of 420 mm and a width of 690 mm. Using 1.0 Å incident X‐rays, these dimensions correspond to a maximum resolutions of 0.71 Å in the vertical direction and 1.58 Å in the horizontal. Upper and lower screens can be used to set the frame size of the recorded image. This function is useful not only to reduce the frame exchange time but also to save disk space on the data server. The use of an IP‐conveyor‐belt and many IP‐readers make Super Galaxy well suited for time‐resolved, monochromatic X‐ray crystallography at a very intense third‐generation SR beamline. Here, Galaxy and a conceptual design for Super Galaxy are described, and their suitability for use as data‐collection systems for macromolecular time‐resolved monochromatic X‐ray crystallography are compared.