AbstractWe crystallised SdsA, a sodium dodecyl sulphate hydrolase, from Pseudomonas aeruginosa in three different crystal polymorphs and determined their three-dimensional structure. The different polymorphs present different crystal packing habits. One of the polymorphs suggests the existence of a tetramer, an oligomeric state not observed previously, while the crystal packing of the remaining two polymorphs obstructs the active site entrance but stabilizes flexible regions of the protein. Non-conventional crystallisation methods that minimise convection such as counter-diffusion in polyvinyl alcohol gel coupled with the influence of a 500 MHz (10.2 Tesla) magnetic field were necessary to isolate the poorest diffracting polymorph and increase its internal order to determine its structure by X-ray diffraction. Our results show the effectiveness of non-conventional crystallographic methods to isolate different crystal polymorphs.

SdsA polymorphs isolation and improvement of their crystal quality using non-conventional crystallisation techniques

D Siliqi;
2015

Abstract

AbstractWe crystallised SdsA, a sodium dodecyl sulphate hydrolase, from Pseudomonas aeruginosa in three different crystal polymorphs and determined their three-dimensional structure. The different polymorphs present different crystal packing habits. One of the polymorphs suggests the existence of a tetramer, an oligomeric state not observed previously, while the crystal packing of the remaining two polymorphs obstructs the active site entrance but stabilizes flexible regions of the protein. Non-conventional crystallisation methods that minimise convection such as counter-diffusion in polyvinyl alcohol gel coupled with the influence of a 500 MHz (10.2 Tesla) magnetic field were necessary to isolate the poorest diffracting polymorph and increase its internal order to determine its structure by X-ray diffraction. Our results show the effectiveness of non-conventional crystallographic methods to isolate different crystal polymorphs.
2015
Istituto di Cristallografia - IC
SdSa
nonconventional protein crystallization methods
gel growth
magnetic field
polyvinyl alcohol
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.14243/270524
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