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pHluorin-assisted expression, purification, crystallization and X-ray diffraction data analysis of the C-terminal domain of the HsdR subunit of the Escherichia coli type I restriction-modification system EcoR124I

. 2016 Sep ; 72 (Pt 9) : 672-6. [epub] 20160809

Language English Country United States Media print-electronic

Document type Journal Article

Links

PubMed 27599856
PubMed Central PMC5012205
DOI 10.1107/s2053230x16011626
PII: S2053230X16011626
Knihovny.cz E-resources

The HsdR subunit of the type I restriction-modification system EcoR124I is responsible for the translocation as well as the restriction activity of the whole complex consisting of the HsdR, HsdM and HsdS subunits, and while crystal structures are available for the wild type and several mutants, the C-terminal domain comprising approximately 150 residues was not resolved in any of these structures. Here, three fusion constructs with the GFP variant pHluorin developed to overexpress, purify and crystallize the C-terminal domain of HsdR are reported. The shortest of the three encompassed HsdR residues 887-1038 and yielded crystals that belonged to the orthorhombic space group C2221, with unit-cell parameters a = 83.42, b = 176.58, c = 126.03 Å, α = β = γ = 90.00° and two molecules in the asymmetric unit (VM = 2.55 Å(3) Da(-1), solvent content 50.47%). X-ray diffraction data were collected to a resolution of 2.45 Å.

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