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Coat protein I (COPI) is a protein complex composed of seven subunits that mediates retrograde transport of proteins and lipids from the cis-Golgi network to the endoplasmic reticulum and intra-Golgi membranes. The medium-sized δ subunit of COPI (δ-COP) is a 57 kDa protein with a C-terminal domain (CTD) and an N-­terminal longin domain. Here, the δ-COP CTD was successfully cloned, purified and crystallized. Diffraction data were collected from native and selenomethionyl crystals of δ-COP CTD to resolutions of 2.60 and 2.30 Å, respectively. Both crystals belonged to space group P21212, with similar unit-cell parameters. The native crystals had unit-cell parameters a = 100.23, b = 136.77, c = 44.39 Å.

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