Expression, purification and crystallization of N-acetyl-(R)- β -phenylalanine acylases derived from Burkholderia sp. AJ110349 and Variovorax sp. AJ110348 and structure determination of the Burkholderia enzyme

In this study, structural analyses were carried out in order to investigate the structure – function relationships of the enzymes derived from both organisms. The recombinant N-acetyl-(R)- β -phenylalanine acylases were crystallized by the hanging-drop vapor-diffusion method under multiple crystallization solution conditions. The crystals of the Burkholderia enzyme belonged to space group P41212, with unit-cell parameters a = b = 112.70 – 112.97, c = 341.50 – 343.32   Å , and were likely to contain two subunits in the asymmetric unit. The crystal structure was solved by the Se-SAD method, suggesting that two subunits in the asymmetric unit form a dimer. Each subunit was composed of three domains, and they showed structural similarity to the corresponding domains of the large subunit of N,N-dimethylformamidase from Paracoccus sp. strain DMF. The crystals of the Variovorax enzyme grew as twinned crystals and were not suitable for structure determination. Using size-exclusion chromatography with online static light-scattering analysis, the N-acetyl-(R)- β -phenylalanine acylases were clarified to be dimeric in solution.
Source: Acta Crystallographica Section F - Category: Biochemistry Authors: Tags: N-acetyl-(R)- β -phenylalanine acylase enantiomer-specific amidohydrolysis Burkholderia sp. AJ110349 Variovorax sp. AJ110348 research communications Source Type: research