title: MERA: a webserver for evaluating backbone torsion angle distributions in dynamic and disordered proteins from NMR data.
abstract: MERA (Maximum Entropy Ramachandran map Analysis from NMR data) is a new webserver that generates residue-by-residue Ramachandran map distributions for disordered proteins or disordered regions in proteins on the basis of experimental NMR parameters. As input data, the program currently utilizes up to 12 different parameters. These include three different types of short-range NOEs, three types of backbone chemical shifts ((15)N, (13)C(α), and (13)C'), six types of J couplings ((3)JHNHα, (3)JC'C', (3)JC'Hα, (1)JHαCα, (2)JCαN and (1)JCαN), as well as the (15)N-relaxation derived J(0) spectral density. The Ramachandran map distributions are reported in terms of populations of their 15° × 15° voxels, and an adjustable maximum entropy weight factor is available to ensure that the obtained distributions will not deviate more from a newly derived coil library distribution than required to account for the experimental data. MERA output includes the agreement between each input parameter and its distribution-derived value. As an application, we demonstrate performance of the program for several residues in the intrinsically disordered protein α-synuclein, as well as for several static and dynamic residues in the folded protein GB3.
authors.affiliation: Faculty of Fundamental Medicine, M.V. Lomonosov Moscow State University, Moscow, Russian Federation, 119991.
authors.forename: Alexey B
authors.initials: AB
authors.lastname: Mantsyzov
authors.affiliation: Laboratory of Chemical Physics, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD, 20892, USA.
authors.forename: Yang
authors.initials: Y
authors.lastname: Shen
authors.affiliation: Laboratory of Chemical Physics, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD, 20892, USA.
authors.forename: Jung Ho
authors.initials: JH
authors.lastname: Lee
authors.affiliation: Max Planck Institute of Biophysics, Max-von-Laue-Straße 3, 60438, Frankfurt am Main, Germany.
authors.forename: Gerhard
authors.initials: G
authors.lastname: Hummer
authors.affiliation: Laboratory of Chemical Physics, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD, 20892, USA. bax@nih.gov.
authors.forename: Ad
authors.initials: A
authors.lastname: Bax
mesh_terms: D019277:Entropy; D020407:Internet; D064267:Intrinsically Disordered Proteins / Q000737:chemistry*; D019906:Nuclear Magnetic Resonance, Biomolecular; D035501:Uncertainty; D051844:alpha-Synuclein / Q000737:chemistry
chemical_list: D064267:Intrinsically Disordered Proteins; D051844:alpha-Synuclein
keywords: Coil library; IDP; Karplus curve; Random coil; Short-range NOE; α-Synuclein