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Volumn 302, Issue 5649, 2003, Pages 1364-1368

Design of a Novel Globular Protein Fold with Atomic-Level Accuracy

Author keywords

[No Author keywords available]

Indexed keywords

COMPUTATIONAL METHODS; CRYSTAL STRUCTURE; ITERATIVE METHODS; TOPOLOGY; X RAY ANALYSIS;

EID: 0345306764     PISSN: 00368075     EISSN: None     Source Type: Journal    
DOI: 10.1126/science.1089427     Document Type: Article
Times cited : (1354)

References (44)
  • 17
    • 0345301933 scopus 로고    scopus 로고
    • The TOPS database is available at www. tops.leeds.ac.uk/.
    • TOPS Database
  • 21
    • 0344007589 scopus 로고    scopus 로고
    • note
    • Materials and methods are available as supporting material on Science Online.
  • 23
    • 0035703089 scopus 로고    scopus 로고
    • R. Bonneau et al., Proteins (suppl. 5), 119 (2001).
    • (2001) Proteins , Issue.SUPPL. 5 , pp. 119
    • Bonneau, R.1
  • 25
    • 0001219475 scopus 로고
    • Cambridge Univ. Press, Cambridge, ed. 2
    • 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.
    • (1992) Numerical Recipes in C , pp. 428-429
    • Press, W.H.1
  • 26
    • 0344438891 scopus 로고    scopus 로고
    • data not shown
    • B. Kuhlman et al., data not shown.
    • Kuhlman, B.1
  • 27
    • 0345301938 scopus 로고    scopus 로고
    • note
    • 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.
  • 29
    • 0344438890 scopus 로고    scopus 로고
    • note
    • 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.
  • 32
    • 0345301937 scopus 로고    scopus 로고
    • note
    • 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.
  • 35
    • 0344870727 scopus 로고    scopus 로고
    • personal communication
    • A. Murzin, personal communication.
    • Murzin, A.1
  • 44
    • 0344007584 scopus 로고    scopus 로고
    • note
    • 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.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.