TNM (torsional network model) is an elastic network model whose degrees of freedom are the torsion angles of the protein backbone. Normal modes of the TNM displace backbone atoms including C β maintaining their covalent geometry.
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Torsional network model: normal modes in torsion angle space better correlate with conformation changes in proteins.
Mendez R, Bastolla U.
Phys Rev Lett. 2010 Jun 4;104(22):228103. Epub 2010 Jun 3.