title: Atomic-resolution crystal structure of the antiviral lectin scytovirin.
abstract: The crystal structures of the natural and recombinant antiviral lectin scytovirin (SVN) were solved by single-wavelength anomalous scattering and refined with data extending to 1.3 A and 1.0 A resolution, respectively. A molecule of SVN consists of a single chain 95 amino acids long, with an almost perfect sequence repeat that creates two very similar domains (RMS deviation 0.25 A for 40 pairs of Calpha atoms). The crystal structure differs significantly from a previously published NMR structure of the same protein, with the RMS deviations calculated separately for the N- and C-terminal domains of 5.3 A and 3.7 A, respectively, and a very different relationship between the two domains. In addition, the disulfide bonding pattern of the crystal structures differs from that described in the previously published mass spectrometry and NMR studies.
authors.affiliation: Protein Structure Section, Macromolecular Crystallography Laboratory, National Cancer Institute, NCI-Frederick, Frederick, Maryland 21702-1201, USA.
authors.forename: Tinoush
authors.initials: T
authors.lastname: Moulaei
authors.forename: Istvan
authors.initials: I
authors.lastname: Botos
authors.forename: Natasza E
authors.initials: NE
authors.lastname: Ziółkowska
authors.forename: Heidi R
authors.initials: HR
authors.lastname: Bokesch
authors.forename: Lauren R
authors.initials: LR
authors.lastname: Krumpe
authors.forename: Tawnya C
authors.initials: TC
authors.lastname: McKee
authors.forename: Barry R
authors.initials: BR
authors.lastname: O'Keefe
authors.forename: Zbigniew
authors.initials: Z
authors.lastname: Dauter
authors.forename: Alexander
authors.initials: A
authors.lastname: Wlodawer
mesh_terms: D000595:Amino Acid Sequence; D001426:Bacterial Proteins / Q000737:chemistry* / Q000302:isolation & purification; D002352:Carrier Proteins / Q000737:chemistry* / Q000302:isolation & purification; D018360:Crystallography, X-Ray; D000458:Cyanobacteria / Q000737:chemistry; D037102:Lectins / Q000737:chemistry* / Q000302:isolation & purification; D008565:Membrane Proteins; D008958:Models, Molecular; D008969:Molecular Sequence Data; D011487:Protein Conformation; D011994:Recombinant Proteins / Q000737:chemistry / Q000302:isolation & purification
chemical_list: D001426:Bacterial Proteins; D002352:Carrier Proteins; D037102:Lectins; D008565:Membrane Proteins; D011994:Recombinant Proteins; C474342:scytovirin protein, S varium