A multicrystal diffraction data-collection approach for studying structural dynamics with millisecond temporal resolution.

ABSTRACT: Many biochemical processes take place on timescales ranging from femto-seconds to seconds. Accordingly, any time-resolved experiment must be matched to the speed of the structural changes of interest. Therefore, the timescale of interest defines the requirements of the X-ray source, instrumentation and data-collection strategy. In this study, a minimalistic approach for in situ crystallization is presented that requires only a few microlitres of sample solution containing a few hundred crystals. It is demonstrated that complete diffraction data sets, merged from multiple crystals, can be recorded within only a few minutes of beamtime and allow high-resolution structural information of high quality to be obtained with a temporal resolution of 40?ms. Global and site-specific radiation damage can be avoided by limiting the maximal dose per crystal to 400?kGy. Moreover, analysis of the data collected at higher doses allows the time-resolved observation of site-specific radiation damage. Therefore, our approach is well suited to observe structural changes and possibly enzymatic reactions in the low-millisecond regime.

SUBMITTER: Schubert R 

PROVIDER: S-EPMC5094441 | biostudies-literature | 2016 Nov

REPOSITORIES: biostudies-literature