The effects of monovalent metal ions on the conformation of human telomere DNA using analytical ultracentrifugation

Soft Matter ◽  
2016 ◽  
Vol 12 (27) ◽  
pp. 5959-5967 ◽  
Author(s):  
Yating Gao ◽  
Sha Wu ◽  
Xiaodong Ye
Keyword(s):  
Metal Ions ◽  
Analytical Ultracentrifugation ◽  
Monovalent Metal ◽  
Human Telomere

scholarly journals Dissolution mechanisms of β-tricalcium phosphate doped with monovalent metal ions

2010 ◽  
Vol 118 (1378) ◽  
pp. 451-457 ◽  
Author(s):  
Naoyuki MATSUMOTO ◽  
Katsumi YOSHIDA ◽  
Kazuaki HASHIMOTO ◽  
Yoshitomo TODA
Keyword(s):  
Metal Ions ◽  
Tricalcium Phosphate ◽  
Monovalent Metal

High LaIII Affinity of a Bis(spirobenzopyran) Azacrown Ether and Photoinduced Switching of its Ion Selectivity between Multivalent and Monovalent Metal Ions

1997 ◽  
Vol 36 (22) ◽  
pp. 2452-2454 ◽  
Author(s):  
Keiichi Kimura ◽  
Tomohito Utsumi ◽  
Takashi Teranishi ◽  
Masaaki Yokoyama ◽  
Hidefumi Sakamoto ◽  
...  
Keyword(s):  
Metal Ions ◽  
Ion Selectivity ◽  
Azacrown Ether ◽  
Monovalent Metal

REACTIONS OF MONOVALENT METAL IONS (M+) WITH MIXED MOLECULAR CLUSTERS (NH3)m(H2O)n AS STUDIED BY LASER-ABLATION MOLECULAR BEAM (LAMB) METHOD: PREFERRED OR NONSPECIFIC COORDINATION

1996 ◽  
Vol 03 (01) ◽  
pp. 671-674 ◽  
Author(s):  
H. SATO ◽  
A. MATSUZAKI ◽  
S. NISHIO ◽  
Y. HORIKI ◽  
O. ITO
Keyword(s):  
Laser Ablation ◽  
Metal Ions ◽  
Gas Phase ◽  
Molecular Beam ◽  
Magic Number ◽  
Molecular Clusters ◽  
The Other ◽  
Monovalent Metal ◽  
Binary Clusters ◽  
Beam Method

Three distinct types of competitive solvation around monopositive metal ions in the gas phase have been revealed by the laser-ablation molecular beam method using binary clusters in the molecular beam: (i) preferred solvation of one of the two components, (ii) essentially nonselective solvation, and (iii) magic-number-like behavior of one component in the presence of the other component in the outer solvation sphere.

Thermal stability of β-tricalcium phosphate doped with monovalent metal ions

2009 ◽  
Vol 44 (9) ◽  
pp. 1889-1894 ◽  
Author(s):  
Naoyuki Matsumoto ◽  
Katsumi Yoshida ◽  
Kazuaki Hashimoto ◽  
Yoshitomo Toda
Keyword(s):  
Thermal Stability ◽  
Metal Ions ◽  
Tricalcium Phosphate ◽  
Monovalent Metal ◽  
Thermal Stability Of

Effect of Calcium and Other Minerals on Ripening of Tomatoes

1979 ◽  
Vol 6 (2) ◽  
pp. 221 ◽  
Author(s):  
RBH Wills ◽  
SIH Tirmazi
Keyword(s):  
Metal Ions ◽  
Colour Change ◽  
Calcium Content ◽  
Divalent Metal ◽  
Divalent Metal Ions ◽  
Fresh Weight ◽  
Ethylene Evolution ◽  
Ripening Process ◽  
Monovalent Metal ◽  
Sodium And Potassium

Ripening of green tomatoes (Lycopersicon esculentum) cv. Daydream, as expressed by change of colour, increased ethylene evolution and respiration, was inhibited when the calcium content of the fruit was raised to greater than 40 mg/100 g fresh weight (1 mmol Ca/100 g). The inhibition of ripening was long-lasting as such fruit showed no signs of ripening even after 6 weeks storage at 20°C, and the application of 1000 �l/l ethylene for 3 weeks had no effect. Application of calcium also inhibited the ripening process in tomatoes that had commenced ripening. Further change in colour was halted and a reduction in respiration and ethylene evolution was observed when calcium was applied at any stage of ripening including fully ripe. Inhibition of ripening was not specific to calcium as other divalent metal ions-manganese, cobalt and magnesium-were as effective as calcium, while the monovalent metal ions sodium and potassium were less effective than calcium but did give some retardation of ripening. Silver was as effective as the divalent metals in inhibiting colour change but its effect on ethylene production was similar to that obtained with sodium and potassium.

scholarly journals A Single Serine Residue Determines Selectivity to Monovalent Metal Ions in Metalloregulators of the MerR Family

2015 ◽  
Vol 197 (9) ◽  
pp. 1606-1613 ◽  
Author(s):  
María M. Ibáñez ◽  
Susana K. Checa ◽  
Fernando C. Soncini
Keyword(s):  
Metal Ions ◽  
Metal Binding ◽  
Metal Ion ◽  
Target Genes ◽  
Divalent Metal ◽  
Serine Residue ◽  
Ion Sensors ◽  
Monovalent Metal ◽  
Divalent Metal Ion ◽  
Metal Ion Sensors

ABSTRACTMerR metalloregulators alleviate toxicity caused by an excess of metal ions, such as copper, zinc, mercury, lead, cadmium, silver, or gold, by triggering the expression of specific efflux or detoxification systems upon metal detection. The sensor protein binds the inducer metal ion by using two conserved cysteine residues at the C-terminal metal-binding loop (MBL). Divalent metal ion sensors, such as MerR and ZntR, require a third cysteine residue, located at the beginning of the dimerization (α5) helix, for metal coordination, while monovalent metal ion sensors, such as CueR and GolS, have a serine residue at this position. This serine residue was proposed to provide hydrophobic and steric restrictions to privilege the binding of monovalent metal ions. Here we show that the presence of alanine at this position does not modify the activation pattern of monovalent metal sensors. In contrast, GolS or CueR mutant sensors with a substitution of cysteine for the serine residue respond to monovalent metal ions or Hg(II) with high sensitivities. Furthermore, in a mutant deleted of the Zn(II) exporter ZntA, they also trigger the expression of their target genes in response to either Zn(II), Cd(II), Pb(II), or Co(II).IMPORTANCESpecificity in a stressor's recognition is essential for mounting an appropriate response. MerR metalloregulators trigger the expression of specific resistance systems upon detection of heavy metal ions. Two groups of these metalloregulators can be distinguished, recognizing either +1 or +2 metal ions, depending on the presence of a conserved serine in the former or a cysteine in the latter. Here we demonstrate that the serine residue in monovalent metal ion sensors excludes divalent metal ion detection, as its replacement by cysteine renders a pan-metal ion sensor. Our results indicate that the spectrum of signals detected by these sensors is determined not only by the metal-binding ligand availability but also by the metal-binding cavity flexibility.

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