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|Title: ||PyrH and PrnB crystal structures|
|Authors: ||De Laurentis, Walter|
|Supervisors: ||Naismith, James|
FADH dependent tryptophan halogenases
|Issue Date: ||Dec-2006|
|Abstract: ||Determination of the three-dimensional structure of enzymes at atomic resolution is a key prerequisite for elucidation of molecular mechanisms of catalysis and catalysis mechanism prediction. X-ray protein crystallography is the most widely used method today for determining protein structures.
In this thesis we describe the expression, purification, crystallization and structure
solution of two new enzymes: PyrH and PrnB.
PyrH is a member of the new emerging family of FADH dependent tryptophan halogenases. It catalyzes the regioselective halogenation of tryptophan at the C-5 position of the indole ring. Elucidation of its structure (Chapter 2) and comparison with PrnA, aregioselective 7th tryptophan halogenase whose structure has already been solved confirmed the proposed mechanism of action for this class of enzymes.
PrnB is the only enzyme known to perform exquisite and peculiar ring rearrangement chemistry: it converts 7-Cl-tryptophan and tryptophan into respectively
monodechloroaminopyrrolnitrin and aminophenylpyrrole. We developed a method for
expression and purification of milligrams of pure and homogeneous recombinant PrnB
(Chapter 3). We identified suitable crystallization conditions and determined PrnB structure
(Chapter 4). Analysis of the PrnB structure helped us to propose a reaction mechanism for
this unique enzyme.|
|Publisher: ||University of St Andrews|
|Appears in Collections:||Chemistry Theses|
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