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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Genetica 106 (1999), S. 75-84 
    ISSN: 1573-6857
    Keywords: nanomanipulation ; molecular mechanics ; protein–DNA complexes ; conformational transitions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We have used internal coordinate molecular mechanics calculations to study how the DNA double helix deforms upon stretching. Results obtained for polymeric DNA under helical symmetry constraints suggest that two distinct forms, an unwound ribbon and a narrow fibre, can be formed as a function of which ends of the duplex are pulled. Similar results are also obtained with DNA oligomers. These experiments lead to force curves which exhibit a plateau as the conformational transition occurs. This behaviour is confirmed by applying an increasing force to DNA and observing a sudden length increase at a critical force value. It is finally shown some DNA binding proteins can also stretch DNA locally, to conformations related to those created by nanomanipulation.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Molecular engineering 5 (1995), S. 1-9 
    ISSN: 1572-8951
    Keywords: Protein structure ; computer simulation ; membrane
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A strategy for modelling transmembrane α-helix bundles has been investigated. Results concerning the rotational orientations of the helices are described and perspectives for extensions of the method are discussed.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Computational Chemistry 18 (1997), S. 1043-1055 
    ISSN: 0192-8651
    Keywords: molecular ; modeling ; nucleic acids ; solvent models ; parameterization ; Chemistry ; Theoretical, Physical and Computational Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Computer Science
    Notes: The Jumna internal coordinate program for modeling nucleic acids was extended to include the force field developed for the Amber program. This forms a bridge between internal and Cartesian coordinate modeling approaches. Using the extensive conformational mapping and substate search facilities available within Jumna, we rigorously compared the behavior of the different force fields and also of different continuum solvent models. The results, which help to explain trends seen in earlier minimization and molecular dynamics simulations, point to the superiority of the latest Amber parameterization (Parm94) and to a surprising degree of agreement with the Flex force field originally developed for Jumna. © 1997 John Wiley & Sons, Inc. J Comput Chem 18:1043-1055, 1997
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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