TITLE

(NZ)CH…O Contacts assist crystallization of a ParB-like nuclease

AUTHOR(S)
Shaw, Neil; Chongyun Cheng; Tempel, Wolfram; Chang, Jessie; Ng, Joseph; Xin-Yu Wang; Perrett, Sarah; Rose, John; Rao, Zihe; Bi-Cheng Wang; Zhi-Jie Liu
PUB. DATE
January 2007
SOURCE
BMC Structural Biology;2007, Vol. 7, p46
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Background: The major bottleneck for determination of 3 D structures of proteins using X-rays is the production of diffraction quality crystals. Often proteins are subjected to chemical modification to improve the chances of crystallization. Results: Here, we report the successful crystallization of a nuclease employing a reductive methylation protocol. The key to crystallization was the successful introduction of 44 new cohesive (NZ) CH...O contacts (3.2 - 3.7 Ã…) by the addition of 2 methyl groups to the side chain amine nitrogen (NZ) of 9 lysine residues of the nuclease. The new contacts dramatically altered the crystallization properties of the protein, resulting in crystals that diffracted to 1.2 Ã… resolution. Analytical ultracentrifugation analysis and thermodynamics results revealed a more compact protein structure with better solvent exclusion of buried Trp residues in the folded state of the methylated protein, assisting crystallization. Conclusion: In this study, introduction of novel cohesive (NZ)CH...O contacts by reductive methylation resulted in the crystallization of a protein that had previously resisted crystallization in spite of extensive purification and crystallization space screening. Introduction of (NZ)CH...O contacts could provide a solution to crystallization problems for a broad range of protein targets.
ACCESSION #
29323599

 

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