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Acta Crystallogr Sect F Struct Biol Cryst Commun. 2011 Sep 1;67(Pt 9):1106-12. doi: 10.1107/S1744309111010220. Epub 2011 Aug 16.

BrabA.11339.a: anomalous diffraction and ligand binding guide towards the elucidation of the function of a 'putative β-lactamase-like protein' from Brucella melitensis.

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  • 1Seattle Structural Genomics Center for Infectious Disease (SSGCID), USA. jabendroth@embios.com

Abstract

The crystal structure of a β-lactamase-like protein from Brucella melitensis was initially solved by SAD phasing from an in-house data set collected on a crystal soaked with iodide. A high-resolution data set was collected at a synchroton at the Se edge wavelength, which also provided an independent source of phasing using a small anomalous signal from metal ions in the active site. Comparisons of anomalous peak heights at various wavelengths allowed the identification of the active-site metal ions as manganese. In the native data set a partially occupied GMP could be identified. When co-crystallized with AMPPNP or GMPPNP, clear density for the hydrolyzed analogs was observed, providing hints to the function of the protein.

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