helix-coil transition

Dictionary of molecular biology. 2004.

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  • Helix-coil transition model — Helix coil transition models are formalized techniques in statistical mechanics developed to describe conformations of linear polymers in solution. The models are usually but not exclusively applied to polypeptides as a measure of the relative… …   Wikipedia

  • Alpha helix — A common motif in the secondary structure of proteins, the alpha helix (α helix) is a right handed coiled conformation, resembling a spring, in which every backbone N H group donates a hydrogen bond to the backbone C=O group of the amino acid… …   Wikipedia

  • random coil — A term originally invented by polymer chemists to describe a disordered tangle of a linear polymer chain with curved sections. In DNA parlance the random coil refers to the structure that results from melting or other forms of separation of the… …   Dictionary of molecular biology

  • Nucleic acid double helix — Double helix redirects here. For other uses, see Double helix (disambiguation). Two complementary regions of nucleic acid molecules will bind and form a double helical structure held together by base pairs. In molecular biology, the term double… …   Wikipedia

  • Zimm-Bragg model — In statistical mechanics, the Zimm Bragg model is a helix coil transition model that describes helix coil transitions of macromolecules, usually polymer chains. Most models provide a reasonable approximation of the fractional helicity of a given… …   Wikipedia

  • Lifson-Roig model — In polymer science, the Lifson Roig model is a helix coil transition model applied to the alpha helix random coil transition of polypeptides;Lifson S, Roig A. (1961). On the theory of helix coil transition in polypeptides. J Chem Phys 34: 1963 74 …   Wikipedia

  • Secondary structure prediction — is a set of techniques in bioinformatics that aim to predict the local secondary structures of proteins and RNA sequences based only on knowledge of their primary structure amino acid or nucleotide sequence, respectively. For proteins, a… …   Wikipedia

  • Transfer-matrix method — In physics and mathematics, the transfer matrix method is a general technique for solving problems in statistical mechanics. The basic idea is to write the partition function in the form:mathcal{Z} = mathbf{v} {0} cdot left{ prod {k=1}^{N}… …   Wikipedia

  • Force field (chemistry) — In the context of molecular mechanics, a force field (also called a forcefield) refers to the functional form and parameter sets used to describe the potential energy of a system of particles (typically but not necessarily atoms). Force field… …   Wikipedia

  • Champ de force (chimie) — Pour les articles homonymes, voir champ de force. Un champ de force peut par exemple être utilisé afin de minimiser l énergie d étirement de cette molécule d éthane. Dans le cadre de la m …   Wikipédia en Français

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