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Volumn 276, Issue 5311, 1997, Pages 421-425

Structural basis for ligand-regulated oligomerization of AraC

Author keywords

[No Author keywords available]

Indexed keywords

ARABINOSE; REGULATOR PROTEIN;

EID: 0030964038     PISSN: 00368075     EISSN: None     Source Type: Journal    
DOI: 10.1126/science.276.5311.421     Document Type: Article
Times cited : (186)

References (37)
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    • R. Schleif, in Escherchia coli and Salmonella Typhimurium, F. Neidhardt et al., Eds. (American Society for Microbiology, Washington, DC, 1996), pp. 1300-1309.
    • (1996) Escherchia Coli and Salmonella Typhimurium , pp. 1300-1309
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    • _, J. Mol. Biol. 178, 611 (1984).
    • (1984) J. Mol. Biol. , vol.178 , pp. 611
  • 15
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    • 2. Optimal results were obtained when crystals were grown by microseeding, with a reservoir solution containing 18% PEG 8000, 100 mM tris-HCl (pH 7.25), and 40 mM magnesium acetate. All cocrystals of AraC and arabinose were initially stabilized in a solution of 24% PEG 8000, 100 mM tris-HCl (pH 7.5), 40 mM magnesium acetate, and 0.2% (w/v) L-arabinose. For data collection, crystals were transferred to the above stabilizing solution plus 10% PEG 400 for 5 to 10 min and then flash-frozen in a small monofilament nylon loop placed in a cold nitrogen stream maintained at 100 K.
    • (1982) Biochemistry , vol.21 , pp. 778
    • Schleif, R.1    Favreau, A.2
  • 16
    • 1842306315 scopus 로고    scopus 로고
    • note
    • Crystals of the sugar-binding and dimerization domain of AraC in the absence of arabinose were grown by hanging-drop vapor diffusion with a reservoir solution of 20% PEG 4000, 0.1 M tris-HCl (pH 9.0), 5 mM KCl, and 0.2 M sodium acetate. Crystals were stabilized by sequential transfer into reservoir solutions containing increasing amounts of PEG 4000 in 4% increments (10 min in each step) until a concentration of 40% PEG 4000 was reached. Crystals were then directly flash-frozen in a 100 K nitrogen stream for data collection.
  • 18
    • 1842281416 scopus 로고    scopus 로고
    • note
    • Accessible surface area calculations were performed with X-PLOR. and probe sizes of 1.4, 1.5, and 1.6 Å gave similar results.
  • 20
    • 1842348506 scopus 로고    scopus 로고
    • note
    • 2 for all water molecules. This does not exclude the possibility that the "water" is a sodium or potassium ion.
  • 27
    • 0000625192 scopus 로고
    • Collaborative Computational Project Number 4
    • Collaborative Computational Project Number 4, Acta Crystallogr. D50, 760 (1994).
    • (1994) Acta Crystallogr. , vol.D50 , pp. 760
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    • 1842304390 scopus 로고    scopus 로고
    • note
    • 47 of monomer B. All waters in the refined model have B factors of less than 50 Å2.
  • 32
    • 25044440954 scopus 로고    scopus 로고
    • personal communication
    • A. T. Brünger, personal communication.
    • Brünger, A.T.1
  • 35
    • 1842361223 scopus 로고    scopus 로고
    • note
    • 2-terminal arm of AraC is better defined in monomer B; therefore, that monomer was used for generation of all sugar-binding figures.
  • 37
    • 1842349465 scopus 로고    scopus 로고
    • note
    • We thank A. Batchelor, E. Reisinger, J. Aishima, and M. Greisman for help with data collection; C. Ogata and R. Abramowitz of beamline X4A at the National Synchrotron Light Source for advice and technical support; and J. Berg, M. Amzel, and E. Lattman for comments on the manuscript. C. Becker, M. Nagypal, S. Jenkins, A. Favreau, M. Williams, and J. Withey helped with purification and crystallization efforts. We thank C. Turgeon and J. Hansen of the University of Texas Health Sciences Center at San Antonio for analyzing samples by analytical ultracentrifugation and A. Brünger and L. Rice for a prerelease version of X-PLOR for torsion angle dynamics refinement. Supported by the Howard Hughes Medical Institute (C.W. and beamlineX4A), the David and Lucile Packard Foundation (C.W.), and grant GM18277 from the National Institutes of Health (R.S.). Atomic coordinates have been deposited at the Brookhaven Protein Data Bank (accession numbers 2ARC and 2ARA).


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