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In-house phase determination of the lima bean trypsin inhibitor: a low-resolution sulfur-SAD case

In-house phase determination of the lima bean trypsin inhibitor: a low-resolution sulfur-SAD case

Acta Crystallographica. Section D, Biological Crystallography 59(Pt 2): 393-395

SAD (single-wavelength anomalous diffraction) has enormous potential for phasing proteins using only the anomalous signal of the almost ubiquitous native sulfur, but requires extremely precise data. The previously unknown structure of the lima bean trypsin inhibitor (LBTI) was solved using highly redundant data collected to 3 ANG using a CCD detector with a rotating-anode generator and three-circle goniometer. The seven 'super-S' atoms (disulfide bridges) were located by dual-space recycling with SHELXD and the high solvent content enabled the density-modification program SHELXE to generate high-quality maps despite the modest resolution. Subsequently, a 2.05 ANG synchrotron data set was collected and used for further phase extension and structure refinement.

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Accession: 010818463

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PMID: 12554963

DOI: 10.1107/s0907444902020917

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