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News Update on Crystal Structure Research: Sep – 2019

September 9, 2019September 9, 2019 by Editor NetKumar

Crystal Structure of Rhodopsin: A G Protein-Coupled Receptor

Heterotrimeric purine nucleotide–binding macromolecule (G protein)–coupled receptors (GPCRs) reply to a spread of various external stimuli and activate G proteins. GPCRs share several structural options, as well as a bundle of seven transmembrane α helices connected by six loops of varied lengths. we tend to determined the structure of retinal purple from optical phenomenon knowledge extending to two.8 angstroms resolution. The extremely organized structure within the extracellular  region, as well as a preserved disulfide bridge, forms a basis for the arrangement of the seven-helix transmembrane motif. [1]

Crystal Structure and Pair Potentials: A Molecular-Dynamics Study

With use of a Lagrangian that permits for the variation of the form and size of the sporadically continuance molecular-dynamics cell, it’s shown that totally different combine potentials cause different crystal structures. [2]

Crystal Structure of the Aequorea victoria Green Fluorescent Protein

The inexperienced fluorescent macromolecule (GFP) from the Pacific Northwest jellyfish Aequorea victoria has cistronrated intense interest as a marker for organic phenomenon and localization of gene product. The chemical group, ensuing from the spontaneous cyclization and chemical reaction of the sequence -Ser65 (or Thr65)-Tyr66-Gly67-, needs the native macromolecule fold for each formation and visible light emission. The structure of Thr65 GFP has been determined at one.9 A resolution. The macromolecule fold consists of associate 11-stranded β barrel with a concentric  helix, with the chemical group forming from the central helix. Directed cause of 1 residue adjacent to the chemical group, Thr203, to Norse deity or His ends up in considerably red-shifted excitation and emission maxima. [3]

Inference-assisted intelligent crystallography based on preliminary data

Crystal structure analysis is habitually accustomed verify atomically resolved molecular structures and structure-property relationships. the buildup of reliable structural characteristics obtained by crystal structure analysis has solid a strong basis that’s often utilized in molecular and materials sciences. However, experimental techniques stay hampered by long ‘blind’ measurement-analysis iterations, that ar generally needed to search out applicable crystals and experimental conditions. Herein, we tend to gift a technique that uses atiny low preliminary knowledge set to judge the to-be-observed structures and also the to-be-collected knowledge. [4]

Crystal Structure and Thermal Properties of Racemic SrC4H4O6•4H2O Single Crystals

Single crystals of racemic metal salt tetrahydrate, SrC4H4O6•4H2O, were mature at 308 K by a gel methodology exploitation colloid because the medium of growth. Differential scanning mensuration, thermogravimetric-differential thermal analysis, and X-ray diffraction measurements were performed on the one crystals. The area cluster symmetry (triclinic P1(__)) and structural parameters were determined at temperature. Weight losses because of thermal decomposition were found to occur within the temperature vary of 370–1170 K, probably because of the evaporation of certain water molecules and therefore the evolution of H2CO, (1/2)O2, and 2CO gases. The chalky white substance remaining within the vessel when decomposition was metal compound SrO. The crystal structure and thermal properties obtained were compared with those of racemic CaC4H4O6•4H2O rumored antecedently. [5]

Reference

[1] Palczewski, K., Kumasaka, T., Hori, T., Behnke, C.A., Motoshima, H., Fox, B.A., Le Trong, I., Teller, D.C., Okada, T., Stenkamp, R.E. and Yamamoto, M., 2000. Crystal structure of rhodopsin: AG protein-coupled receptor. science, 289(5480), (Web Link)

[2] Parrinello, M. and Rahman, A., 1980. Crystal structure and pair potentials: A molecular-dynamics study. Physical Review Letters, 45(14), p.1196. (Web Link)

[3] Ormö, M., Cubitt, A.B., Kallio, K., Gross, L.A., Tsien, R.Y. and Remington, S.J., 1996. Crystal structure of the Aequorea victoria green fluorescent protein. Science, 273(5280), pp.1392-1395. (Web Link)

[4] Inference-assisted intelligent crystallography based on preliminary data
Manabu Hoshino, Yoshinori Nakanishi-Ohno & Daisuke Hashizume
Scientific Reportsvolume 9, Article number: 11886 (2019) (Web Link)

[5] Fukami, T., Hiyajyo, S., Tahara, S. and Yasuda, C. (2017) “Crystal Structure and Thermal Properties of Racemic SrC4H4O6•4H2O Single Crystals”, International Research Journal of Pure and Applied Chemistry, 14(2), (Web Link)

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