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Nitrophorins (nitric oxide transport proteins) are haemproteins originating from the blood-feeding insect Rhodnius prolixus. They consist of an eight-stranded β-­barrel, which classifies them into the lipocalin family. Nitrophorin 7 (NP7) and the E27V mutant protein NP7(E27V) were crystallized at 277 K using the vapour-diffusion method with PEG as the precipitating agent. Data sets for wild-­type NP7 and NP7(E27V) were collected to 1.80 Å resolution from single crystals at 100 K using synchrotron radiation. The crystals belonged to space group P21, with unit-cell parameters a = 38, b = 67, c = 39 Å, β = 117°. The crystal contained one molecule per asymmetric unit, with a Matthews coefficient (VM) of 2.11 Å3 Da−1; the solvent content was estimated to be 41.8%.

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