1obu

From Proteopedia

proteopedia linkproteopedia link

spinqualitylabelsall models 1obu, resolution 2.00Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image

APOCRUSTACYANIN C1 CRYSTALS GROWN IN SPACE AND EARTH USING VAPOUR DIFFUSION GEOMETRY

Overview

Models of apocrustacyanin C(1) were refined against X-ray data recorded on, Bending Magnet 14 at the ESRF to resolutions of 1.85 and 2 A from a, space-grown and an earth-grown crystal, respectively, both using, vapour-diffusion crystal-growth geometry. The space crystals were grown in, the APCF on the NASA Space Shuttle. The microgravity crystal growth showed, a cyclic nature attributed to Marangoni convection, thus reducing the, benefits of the microgravity environment, as reported previously [Chayen, et al. (1996), Q. Rev. Biophys. 29, 227-278]. A subsequent mosaicity, evaluation, also reported previously, showed only a partial improvement in, the space-grown crystals over the earth-grown crystals [Snell et al., (1997), Acta Cryst. D53, 231-239], contrary to the case for lysozyme, crystals grown in space with liquid-liquid diffusion, i.e. without any, major motion during growth [Snell et al. (1995), Acta Cryst. D52, 1099-1102]. In this paper, apocrustacyanin C(1) electron-density maps from, the two refined models are now compared. It is concluded that the, electron-density maps of the protein and the bound waters are found to be, better overall for the structures of apocrustacyanin C(1) studied from the, space-grown crystal compared with those from the earth-grown crystal, even, though both crystals were grown using vapour-diffusion crystal-growth, geometry. The improved residues are on the surface of the protein, with, two involved in or nearby crystal lattice-forming interactions, thus, linking an improved crystal-growth mechanism to the molecular level. The, structural comparison procedures developed should themselves be valuable, for evaluating crystal-growth procedures in the future.

About this Structure

1OBU is a Single protein structure of sequence from Homarus gammarus. Full crystallographic information is available from OCA.

Reference

Apocrustacyanin C(1) crystals grown in space and on earth using vapour-diffusion geometry: protein structure refinements and electron-density map comparisons., Habash J, Boggon TJ, Raftery J, Chayen NE, Zagalsky PF, Helliwell JR, Acta Crystallogr D Biol Crystallogr. 2003 Jul;59(Pt 7):1117-23. Epub 2003, Jun 27. PMID:12832753

Page seeded by OCA on Tue Nov 20 22:54:15 2007