Enzymatic Characterization of Fructose 1,6-Bisphosphatase II from Francisella tularensis, an Essential Enzyme for Pathogenesis.

Abstract:

:The glpX gene from Francisella tularensis encodes for the class II fructose 1,6-bisphosphatase (FBPaseII) enzyme. The glpX gene has been verified to be essential in F. tularensis, and the inactivation of this gene leads to impaired bacterial growth on gluconeogenic substrates. In the present work, we have complemented a ∆glpX mutant of Escherichia coli with the glpX gene of F. tularensis (FTF1631c). Our complementation work independently verifies that the glpX gene (FTF1631c) in F. tularensis is indeed an FBPase and supports the growth of the ΔglpX E. coli mutant on glycerol-containing media. We have performed heterologous expression and purification of the glpX encoded FBPaseII in F. tularensis. We have confirmed the function of glpX as an FBPase and optimized the conditions for enzymatic activity. Mn2+ was found to be an absolute requirement for activity, with no other metal substitutions rendering the enzyme active. The kinetic parameters for this enzyme were found as follows: Km 11 μM, Vmax 2.0 units/mg, kcat 1.2 s-1, kcat/Km 120 mM-1 s-1, and a specific activity of 2.0 units/mg. Size exclusion data suggested an abundance of a tetrameric species in solution. Our findings on the enzyme's properties will facilitate the initial stages of a structure-based drug design program targeting this essential gene of F. tularensis.

authors

Gutka HJ,Wolf NM,Bondoc JMG,Movahedzadeh F

doi

10.1007/s12010-017-2512-6

subject

Has Abstract

pub_date

2017-12-01 00:00:00

pages

1439-1454

issue

4

eissn

0273-2289

issn

1559-0291

pii

10.1007/s12010-017-2512-6

journal_volume

183

pub_type

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