Schuldt L, Suchowersky R, Veith K, Mueller-Dieckmann J, Weiss MS. Cloning, expression, purification, crystallization and preliminary X-ray diffraction analysis of the regulatory domain of aspartokinase (Rv3709c) from Mycobacterium tuberculosis.
Acta Crystallogr Sect F Struct Biol Cryst Commun 2011;
67:380-5. [PMID:
21393848 PMCID:
PMC3053168 DOI:
10.1107/s1744309111000030]
[Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2010] [Accepted: 01/03/2011] [Indexed: 03/04/2023]
Abstract
The regulatory domain of Mycobacterium tuberculosis aspartokinase (Mtb-AK, Mtb-Ask, Rv3709c) has been cloned, heterologously expressed in Escherichia coli and purified using standard chromatographic techniques. Screening for initial crystallization conditions using the regulatory domain (AK-β) in the presence of the potential feedback inhibitor threonine identified four conditions which yielded crystals suitable for X-ray diffraction analysis. From these four conditions five different crystal forms of Mtb-AK-β resulted, three of which belonged to the orthorhombic system, one to the tetragonal system and one to the monoclinic system. The highest resolution (1.6 Å) was observed for a crystal form belonging to space group P2(1)2(1)2(1), with unit-cell parameters a=53.70, b=63.43, c=108.85 Å and two molecules per asymmetric unit.
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