On a discretizable subclass of instances of the molecular distance geometry problem

  • Authors:
  • Carlile Lavor;Leo Liberti;Antonio Mucherino;Nelson Maculan

  • Affiliations:
  • State University of Campinas, Campinas-SP, Brazil;École Polytechnique, Palaiseau, France;École Polytechnique, Palaiseau, France;Federal University of Rio de Janeiro, Rio de Janeiro, Brazil

  • Venue:
  • Proceedings of the 2009 ACM symposium on Applied Computing
  • Year:
  • 2009

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Abstract

The molecular distance geometry problem can be formulated as the problem of finding an immersion in R3 of a given undirected, nonnegatively weighted graph G. In this paper, we discuss a set of graphs G for which the problem may also be formulated as a combinatorial search in discrete space. This is theoretically interesting as an example of "combinatorialization" of a continuous nonlinear problem. It is also algorithmically interesting because the natural combinatorial solution algorithm performs much better than a global optimization approach on the continuous formulation. We present a Branch and Prune algorithm which can be used for obtaining a set of positions of the atoms of protein conformations when only some of the distances between the atoms are known.