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• W2032078031 abstract "The crystal structure of hexon, the major coat protein from adenovirus type 2, has been refined at 2.9 A resolution. Hexon is a homo-trimer (molecular mass 3 x 109,077 Da) and crystallizes in the cubic space group P2(1)3, with a cell edge of 150.5 A. There are four molecules in the unit cell so that the crystallographic asymmetric unit contains one subunit of the trimer. The electron density in most regions is well-defined and 880 amino acid residues, of the 967 in this unusually long polypeptide chain, have been located and fitted. The N terminus (1 to 43) and three internal stretches (192 to 203, 270 to 291 and 444 to 453) are not defined, and a stretch (168 to 207) with unclear side-chain density is modelled as poly(Ala/Gly). The current refined model, consisting of 6943 non-hydrogen protein atoms and 85 water molecules, yields an R-factor of 19.9% for 18,176 reflections in the resolution range 5.0 to 2.9 A. The model has reasonable geometry with root-mean-square deviations from ideal bond lengths of 0.022 A and angle-related 1-3 distances of 0.056 A. The overall shape of the trimeric hexon molecule is unusual and may be divided into a pseudo-hexagonal base rich in beta-structure, and a triangular top formed from three long loops containing some secondary structure. The base contains two similar pedestal domains, P1 and P2, each of which is a flattened eight-stranded beta-barrel with the jelly-roll greek key topology characteristic of other viral coat proteins. P1 and P2 are related by an approximate 6-fold operation about the molecular 3-fold axis so that six barrels form the walls of the tubular hexon base. The hexon bases form close-packed p3 arrays on each facet of the icosahedral adenovirus virion. Unlike other viral capsids, the barrel axes are almost perpendicular to rather than parallel with the capsid surface. The hexon top, which consists of intimately interacting loops emerging from P1 and P2 in the base, has a triangular outline and so does not exhibit the pseudo-symmetry of the base. The structure of the hexon trimer shows how economically it meets the demands of its function as a stable protective viral coat, reveals the significance of the special features in its unusual amino acid sequence, and explains its biochemical and immunological properties. The molecule is hollow, with a large central cavity, and so has a high effective volume for its mass.(ABSTRACT TRUNCATED AT 400 WORDS)" @default.
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• W2032078031 date "1994-09-01" @default.
• W2032078031 modified "2023-10-14" @default.
• W2032078031 title "The Refined Crystal Structure of Hexon, the Major Coat Protein of Adenovirus Type 2, at 2·9 Å Resolution" @default.
• W2032078031 doi "https://doi.org/10.1006/jmbi.1994.1593" @default.
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