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During cofactor F420 biosynthesis, the enzyme F420-γ-glutamyl ligase (FbiB) catalyzes the addition of γ-linked L-glutamate residues to form polyglutamyl­ated F420 derivatives. In Mycobacterium tuberculosis, Rv3262 (FbiB) consists of two domains: an N-terminal domain from the F420 ligase superfamily and a C-­terminal domain with sequence similarity to nitro-FMN reductase superfamily proteins. To characterize the role of the C-terminal domain of FbiB in polyglutamyl ligation, it has been purified and crystallized in an apo form. The crystals diffracted to 2.0 Å resolution using a synchrotron source and belonged to the tetragonal space group P41212 (or P43212), with unit-cell parameters a = b = 136.6, c = 101.7 Å, α = β = γ = 90°.

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