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0345301933
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The TOPS database is available at www. tops.leeds.ac.uk/.
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TOPS Database
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0344007589
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note
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Materials and methods are available as supporting material on Science Online.
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0001219475
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Cambridge Univ. Press, Cambridge, ed. 2
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We used the Davidson-Fletcher-Powell algorithm as described by W. H. Press et al., in Numerical Recipes in C (Cambridge Univ. Press, Cambridge, ed. 2, 1992), pp. 428-429.
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Press, W.H.1
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26
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0344438891
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data not shown
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B. Kuhlman et al., data not shown.
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Kuhlman, B.1
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0345301938
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note
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The sequence of Top7 is mgDIQVQVNIDDNGKNFDYTYTVTTESELQKVLNELKDYIKKQGAKRVRISITARTKKEAEKFAA- ILIKVFAELGYNDINVTFDGDTVTVEGQLEggslehhhhhh; the computationally designed sequence is in uppercase and residues added to allow expression and purification are in lowercase. Single-letter abbreviations for the amino acid residues are as follows: A, Ala; C, Cys; D, Asp; E, Glu; F, Phe; G, Gly; H, His; I, Ile; K, Lys; L, Leu; M, Met; N, Asn; P, Pro; Q, Gln; R, Arg; S, Ser, T, Thr, V, Val; W, Trp; and Y, Tyr.
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0344438890
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note
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A synthetic gene with the Top7 sequence under the control of the T7 promoter, a C-terminal 6X His tag, and codon usage optimized for Escherichia coli was obtained from BlueHeron Biotechnologies (Bothell, WA). After expression in E. coli, the protein was readily purified to >95% homogeneity with the use of nickel affinity chromatography followed by anion exchange chromatography.
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0345301937
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note
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The structure of Top7_K35M was solved by molecular replacement with the program EPMR (39) and by direct rebuilding into an unbiased SAD electron density map and residual difference Fourier maps. For molecular replacement, 19 large surface residues such as Lys, Arg, Gln, and Glu were truncated to Ala in the search model. The correlation coefficient for the initial MR search, using data to 4.0 Å resolution, was 0.52, compared with background of 0.36. For SAD phasing, the position of SeMet 37 was determined from an anomalous difference Patterson map. The initial phasing power and figure of merit for SAD phasing were 1.99 and 0.24, respectively, before density modification. An interpretable electron density map was obtained after density modification with solvent flipping with a solvent content of 43% with the use of CNS (40). An initial model was built with the use of XtalView (41) and O (42). The model was refined with CNS With the use of the mlhl target (maximum likelihood, Hendrickson-Lattman coefficients) with 5% of the data excluded for the calculation of the cross-validating free R. Of all the built residues, 88% are in the most favorable regions of Ramachandran space, and 12% are in the allowed regions. Statistics from phasing and refinement are shown in table S2.
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0030792253
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0344870727
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personal communication
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A. Murzin, personal communication.
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Murzin, A.1
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0038242197
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84889120137
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44
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0344007584
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note
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We acknowledge the expert assistance of B. Shen in crystallographic phasing, modeling, and refinement of the TOP7 structure, C. Rohl for aiding in the incorporation of RosettaDesign into Rosetta, C. Strauss for helping to generate the initial models of Top7, T. Leeper for help with two-dimensional NMR studies, and R. Klevit and the Klevit laboratory for help with preliminary NMR characterization of Top7. Academic users can obtain licensing information for RosettaDesign at www.unc.edu/ kuhlmanpg/rosettadesign.htm. The coordinates and structure factors for the Top7 x-ray crystal structure have been deposited in the PDB with accession code 1QYS. B.K. was supported by a fellowship from the Cancer Research Fund of the Damon Runyon-Walter Winchell Foundation. This work was also supported by NIH grants to G.V., B.L.S., and D.B.
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