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Full‐length nisin immunity protein NisI from Lactococcus lactis in a lipid‐free form: crystallization and X‐ray analysis

Full‐length nisin immunity protein NisI from Lactococcus lactis in a lipid‐free form:... NisI is a lantibiotic‐binding lipoprotein that is specific for nisin. Nisin‐producing microorganisms use NisI as an immunity protein for self‐protection against nisin. Here, the purification, crystallization and preliminary X‐ray diffraction of full‐length NisI from Lactobacillus lactis in a lipid‐free form (NisI22‐C) are reported. Importantly, reductive methylation of the lysine residues in NisI22‐C was essential for initial crystallization. Only methylated NisI22‐C crystallized. The optimized crystals of methylated NisI22‐C were grown in 30–40 mM ammonium sulfate, 0.1 M sodium acetate pH 4.6, 16–18% PEG 4000 at 295 K and diffracted to 1.9 Å resolution. The crystal belonged to space group P212121, with unit‐cell parameters a = 45.99, b = 76.67, c = 76.39 Å, α = β = γ = 90.0°. Assuming the presence of one molecule in the asymmetric unit, the estimated Matthews coefficient (VM) is 2.58 Å3 Da−1 and the estimated solvent content is 52.3%. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Acta Crystallographica Section F Wiley

Full‐length nisin immunity protein NisI from Lactococcus lactis in a lipid‐free form: crystallization and X‐ray analysis

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References (29)

Publisher
Wiley
Copyright
Copyright © 2017 Wiley Subscription Services
ISSN
2053-230X
eISSN
2053-230X
DOI
10.1107/S2053230X17008214
pmid
28695849
Publisher site
See Article on Publisher Site

Abstract

NisI is a lantibiotic‐binding lipoprotein that is specific for nisin. Nisin‐producing microorganisms use NisI as an immunity protein for self‐protection against nisin. Here, the purification, crystallization and preliminary X‐ray diffraction of full‐length NisI from Lactobacillus lactis in a lipid‐free form (NisI22‐C) are reported. Importantly, reductive methylation of the lysine residues in NisI22‐C was essential for initial crystallization. Only methylated NisI22‐C crystallized. The optimized crystals of methylated NisI22‐C were grown in 30–40 mM ammonium sulfate, 0.1 M sodium acetate pH 4.6, 16–18% PEG 4000 at 295 K and diffracted to 1.9 Å resolution. The crystal belonged to space group P212121, with unit‐cell parameters a = 45.99, b = 76.67, c = 76.39 Å, α = β = γ = 90.0°. Assuming the presence of one molecule in the asymmetric unit, the estimated Matthews coefficient (VM) is 2.58 Å3 Da−1 and the estimated solvent content is 52.3%.

Journal

Acta Crystallographica Section FWiley

Published: Jan 1, 2017

Keywords: ; ; ; ;

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