Do metal ions alter the protein secondary structure of a light-harvesting complex of thylakoid membranes?

Nahar, S.; Tajmir-Riahi, H.A.

doi:10.1016/0162-0134(94)00055-f

Cited by 25 publications

(20 citation statements)

References 25 publications

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“…[16][17][18][19][20][21][22] Due to various of complex sites in peptide monomer including the nitrogen atom at the N-terminus, the carboxylate group at the C-terminus, and the oxygen or nitrogen atoms presenting in the backbone chain, it is difficult to determine which complex site is for sodium binding. The site is a competitive complexation determined by the particular solvent condition.…”

Section: Discussionmentioning

confidence: 99%

Investigation on structure and properties of a novel designed peptide

et al. 2009

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Although the existing design principle of full-sequence ionic complement is convenient for the development of peptides, it greatly constrains the exploration of peptides with other possible assembly mechanisms and different yet essential functions. Herein, a novel designed half-sequence ionic complementary peptide (referred to as P9), AC-Pro-Ser-Phe-Asn-Phe-Lys-Phe-Glu-Pro-NH 2 , is reported. When transferred from pure water to sodium chloride solution, P9 underwent a dramatic morphological transformation from globular aggregations to nanofibers. Moreover, the rheological experiment showed that the P9 could form a hydrogel with a storage modulus of about 30 Pa even at very low peptide concentration (0.5% (wt/vol)). The P9 hydrogel formed in salt solution could recover in a period of about 1,800 sec, which is faster than that in the pure water. The data suggested that the half-sequence, ionic complementary peptide might be worthy of further research for its special properties.

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Section: Discussionmentioning

confidence: 99%

Investigation on structure and properties of a novel designed peptide

et al. 2009

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“…As follows from L1(3) and N1 (3) that this spectral feature can be associated with isomer K1 (3). Since this isomer is predicted not to be present for the untagged clusters under the equilibrium conditions enforced by the REPIMD formalism, it is possible that it was observed in experiments due to stabilization effects associated with Ar-tagging or because it was trapped under nonequilibrium conditions during the supersonic expansion.…”

Section: Resultsmentioning

confidence: 96%

“…Nuclear quantum effects clearly play a major role in determining the relative stability of the different isomers of Rb + (H 2 O) 3 and Cs + (H 2 O) 3 . In particular, the minimum-energy structure, isomer R1(3), of Rb + (H 2 O) 3 , which is the most abundant isomer at the classical level up to ∼80 K, is not present at any temperature when ZPE contributions are taken into account within the REPIMD formalism.…”

Section: Resultsmentioning

confidence: 99%

“…For example, charged species are often found as intermediates in chemical reactions and catalytic processes. 1,2 In biochemistry, ions play a central role in the stabilization of biomolecules [3][4][5] as well as in mediating protein-protein interactions, 6,7 intracellular signal transduction, 8,9 and enzyme and nucleic acid catalysis. [10][11][12][13] Ionic clusters carry electric currents and are involved in the formation and evolution of aerosol particles in the atmosphere, 14,15 while ionic solutions are central to many devices such as electrolytic cells, capacitors, and batteries.…”

Section: Introductionmentioning

confidence: 99%

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Isomeric Equilibria, Nuclear Quantum Effects, and Vibrational Spectra of M+(H2O)n=1−3 Clusters, with M = Li, Na, K, Rb, and Cs, Through Many-Body Representations

Riera¹,

Brown²,

Paesani³

2018

Preprint

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A quantitative characterization of the molecular mechanisms that regulate ion solvation is key to the microscopic understanding of fundamental processes taking place in aqueous environments, with major implications for different fields, from atmospheric chemistry to materials research and biochemistry. This study presents a systematic analysis of isomeric equilibria for small M + (H 2 O) n clusters, with M = Li, Na, K, Rb, and Cs, from 0 K to 200 K. To determine the relative stability of different isomers of 1 each M + (H 2 O) n cluster as a function of temperature, replica exchange simulations are carried out at both classical and quantum levels with the recently developed many-body MB-nrg potential energy functions, which have been shown to exhibit chemical accuracy. Anharmonic vibrational spectra are then calculated within the local monomer approximation and found to be in agreement with the available experimental data, providing further support for the accuracy of the MB-nrg potential energy functions.The present analysis indicates that nuclear quantum effects become increasingly important for larger M + (H 2 O) n clusters containing the heavier alkali metal ions, which is explained in terms of competing ion-water and water-water interactions along with the interplay between energetic and entropic effects. Directly connecting experimental measurements with molecular properties calculated at the quantum mechanical level, this study represents a further step toward the development of a consistent picture of ion hydration from the gas to the condensed phase.

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“…In particular, Penicillium chrysogenum. Two derivative features in the 840 -660 cm -1 region associated to Fe(II)-protein complexes due to a minor perturbation of the protein C-C and C-S stretching modes were also observed in the EO@Fe_Mr and EO@Fe_Pc specimens (Nahar and Tajmir-Riahi, 1995).…”

Section: Fungimentioning

confidence: 87%

Development of analytical methods for the characterization of tempera paintings at micro- and nano-scale and their deterioration and biodeterioration processes.

Miranda¹

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Do metal ions alter the protein secondary structure of a light-harvesting complex of thylakoid membranes?

Cited by 25 publications

References 25 publications

Investigation on structure and properties of a novel designed peptide

Investigation on structure and properties of a novel designed peptide

Isomeric Equilibria, Nuclear Quantum Effects, and Vibrational Spectra of M+(H2O)n=1−3 Clusters, with M = Li, Na, K, Rb, and Cs, Through Many-Body Representations

Development of analytical methods for the characterization of tempera paintings at micro- and nano-scale and their deterioration and biodeterioration processes.

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