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Vazquez de Vasquez MG, Wellen Rudd BA, Baer MD, Beasley EE, Allen HC. Role of Hydration in Magnesium versus Calcium Ion Pairing with Carboxylate: Solution and the Aqueous Interface. J Phys Chem B 2021; 125:11308-11319. [PMID: 34601874 DOI: 10.1021/acs.jpcb.1c06108] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The binding of group II metal cations such as Ca2+ and Mg2+ has been largely categorized as electrostatic or ionic using carboxylate symmetric and asymmetric stretching frequency assignments that have been historically used with little regard for the solvation environment of aqueous solutions. However, given the importance of these cations and their binding mechanisms related to biological function and in revealing surface enrichment factors for ocean to marine aerosol transfer, it is imperative that a deeper understanding be sought to include hydration effects. Here, infrared reflection-absorption and Raman spectra for surface and solution phase carboxylate binding information, respectively, are compared against bare (unbound) carboxylate and bidentate Zn2+:carboxylate spectral signatures. Spectral non-coincidence effect analysis, temperature studies, and spectral and potential of mean force calculations result in a concise interpretation of binding motifs that include the role of mediating water molecules, that is, contact and solvent-shared ion pairs. Calcium directly binds to the carboxylate group in contact ion pairs where magnesium rarely does. Moreover, we reveal the dominance of the solvent-shared ion pair of magnesium with carboxylate at the air-water interface and in solution.
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Affiliation(s)
| | - Bethany A Wellen Rudd
- Department of Chemistry, Ohio Wesleyan University, Delaware, Ohio 43015, United States
| | - Marcel D Baer
- Physical Sciences Division, Pacific Northwest National Laboratory, Richland, Washington 99352, United States
| | - Emma E Beasley
- Department of Chemistry & Biochemistry, The Ohio State University, Columbus, Ohio 43210, United States
| | - Heather C Allen
- Department of Chemistry & Biochemistry, The Ohio State University, Columbus, Ohio 43210, United States
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Recent advances in the aqueous chemistry of the calcium(II)-gluconate system – Equilibria, structure and composition of the complexes forming in neutral and in alkaline solutions. Coord Chem Rev 2020. [DOI: 10.1016/j.ccr.2020.213337] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Mendes de Oliveira D, Zukowski SR, Palivec V, Hénin J, Martinez-Seara H, Ben-Amotz D, Jungwirth P, Duboué-Dijon E. Binding of divalent cations to acetate: molecular simulations guided by Raman spectroscopy. Phys Chem Chem Phys 2020; 22:24014-24027. [DOI: 10.1039/d0cp02987d] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We combine Raman-MCR vibrational spectroscopy experiments with ab initio and classical MD simulations to gain molecular insights into carboxylate–cation binding.
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Affiliation(s)
| | | | - Vladimir Palivec
- Institute of Organic Chemistry and Biochemistry
- Academy of Sciences of the Czech Republic
- Flemingovo nám. 2
- 16610 Prague 6
- Czech Republic
| | - Jérôme Hénin
- CNRS, Université de Paris
- UPR 9080
- Laboratoire de Biochimie Théorique
- 13 Rue Pierre et Marie Curie
- Paris
| | - Hector Martinez-Seara
- Institute of Organic Chemistry and Biochemistry
- Academy of Sciences of the Czech Republic
- Flemingovo nám. 2
- 16610 Prague 6
- Czech Republic
| | - Dor Ben-Amotz
- Department of Chemistry
- Purdue University
- West Lafayette
- USA
| | - Pavel Jungwirth
- Institute of Organic Chemistry and Biochemistry
- Academy of Sciences of the Czech Republic
- Flemingovo nám. 2
- 16610 Prague 6
- Czech Republic
| | - Elise Duboué-Dijon
- Institute of Organic Chemistry and Biochemistry
- Academy of Sciences of the Czech Republic
- Flemingovo nám. 2
- 16610 Prague 6
- Czech Republic
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McGuigan JAS, Kay JW, Elder HY. Ionized concentrations in Ca 2+ and Mg 2+ buffers must be measured, not calculated. Exp Physiol 2019; 105:427-437. [PMID: 31758871 DOI: 10.1113/ep088345] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2019] [Accepted: 11/22/2019] [Indexed: 11/08/2022]
Abstract
NEW FINDINGS What is the topic of this review? The [Ca2+ ]/[Mg2+ ] in buffers are usually calculated using one of eight programs. These all give different values, thus [Ca2+ ]/[Mg2+ ] must be measured. What advances does it highlight? The ligand optimization method (LOM) using electrodes is an accurate method to do this. The limitations of the method are described. The LOM has been generalized to include calibration of fluorochromes and aequorin. It is the method of choice to measure intracellular equilibrium constants. Owing to the uncertainties for the values of resting [Ca2+ ], ∆[Ca2+ ] and the pK' values for intracellular Ca2+ /Mg2+ binding used in modelling, these values must now be re-examined critically. ABSTRACT Modelling intracellular regulation of Ca2+ /Mg2+ is now an established part of physiology. However, the conclusions drawn from such studies depend on accurate knowledge of intracellular [Ca2+ ], ∆[Ca2+ ] and the pK' values for the intracellular binding of Ca2+ /Mg2+ . Calculation of [Ca2+ ]/[Mg2+ ] in buffers is normal. The eight freely available programs all give different values for the [Ca2+ ]/[Mg2+ ] in the buffer solutions, varying by up to a factor of 4.3. As a result, concentrations must be measured. There are two methods to do this, both based on the ligand optimization method (LOM): (1) calibration solutions from 0.5 to 4 mmol l-1 ; and (2) calibration solutions from 0.1 µmol l-1 to 2 mmol l-1 . Both methods can be used to calibrate Ca2+ /Mg2+ electrodes. Only Method 2 can be used directly to calibrate fluorochromes and aequorin. Software in the statistical program R to calculate the [Ca2+ ]/[Mg2+ ] in buffers is provided for both methods. The LOM has now been generalized for use with electrodes, fluorochromes and aequorin, making it the ideal method to determine the pK' values for intracellular binding of Ca2+ /Mg2+ . The [Ca2+ ]/[Mg2+ ] in buffers must be measured routinely, which is best done by calibrating electrodes with the LOM and software written in R. If [Ca2+ ]/[Mg2+ ] in buffers are calculated, the parameters used in modelling show the same degree of variability as the software programs. Uncritical acceptance of such parameters means that conclusions reached from such studies are relative, not absolute, and must now be re-examined.
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Affiliation(s)
| | - James W Kay
- School of Mathematics and Statistics, University of Glasgow, Glasgow, G12 8QQ, UK
| | - Hugh Y Elder
- School of Life Sciences, University of Glasgow, Glasgow, G12 8QQ, UK
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Sheng L, Liu J, Zhang C, Zou L, Li YY, Xu ZP. Pretreating anaerobic fermentation liquid with calcium addition to improve short chain fatty acids extraction via in situ synthesis of layered double hydroxides. BIORESOURCE TECHNOLOGY 2019; 271:190-195. [PMID: 30268014 DOI: 10.1016/j.biortech.2018.09.086] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/30/2018] [Revised: 09/09/2018] [Accepted: 09/16/2018] [Indexed: 06/08/2023]
Abstract
In situ synthesis of layered double hydroxides (LDHs) was proved to be an effective way to extract short chain fatty acids (SCFAs) from anaerobic fermentation liquid (AFL) as carbon source for biodenitrification, but the SCFAs content in SCFAs-LDH was unsatisfactory because of the existence of much carbonate in AFL. Pretreatment of AFL with calcium addition was investigated to remove carbonate and improve SCFAs extraction via LDHs synthesis. Results of batch tests showed that, the carbonate removal efficiency was as high as 76.6% when the calcium addition was 0.06 mol/L at pH 12. When using the optimal SCFAs/Al3+ ratio of 3.0, the total SCFAs content in SCFAs-LDH with pretreatment was improved to 46.5 mg COD/g LDH, which was 4.5 times of the control (10.4 mg COD/g LDH). These results suggest that adding calcium to AFL was an effective way to eliminate the negative effect of carbonates on SCFAs-LDH synthesis.
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Affiliation(s)
- Liang Sheng
- School of Environmental and Chemical Engineering, Shanghai University, 333 Nanchen Road, Shanghai 200444, China
| | - Jianyong Liu
- School of Environmental and Chemical Engineering, Shanghai University, 333 Nanchen Road, Shanghai 200444, China.
| | - Cheng Zhang
- School of Environmental and Chemical Engineering, Shanghai University, 333 Nanchen Road, Shanghai 200444, China
| | - Lianpei Zou
- School of Environmental and Chemical Engineering, Shanghai University, 333 Nanchen Road, Shanghai 200444, China
| | - Yu-You Li
- Department of Civil and Environmental Engineering, Graduate School of Engineering, Tohoku University, 6-6-06 Aza, Aramaki, Aoba-ku, Sendai, Miyagi 980-8579, Japan
| | - Zhi Ping Xu
- ARC Centre of Excellence for Functional Nanomaterials, Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, Brisbane, QLD 4072, Australia
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An improved measurement of the Ca2+-binding affinity of fluorescent Ca2+ indicators. Cell Calcium 2018; 71:86-94. [DOI: 10.1016/j.ceca.2018.01.001] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2017] [Revised: 12/11/2017] [Accepted: 01/07/2018] [Indexed: 01/18/2023]
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Abstract
Magnesium (Mg2+) is an essential mineral without known specific regulatory mechanisms. In ruminants, plasma Mg2+ concentration depends primarily on the balance between Mg2+ absorption and Mg2+ excretion. The primary site of Mg2+ absorption is the rumen, where Mg2+ is apically absorbed by both potential-dependent and potential-independent uptake mechanisms, reflecting involvement of ion channels and electroneutral transporters, respectively. Transport is energised in a secondary active manner by a basolateral Na+/Mg2+ exchanger. Ruminal transport of Mg2+ is significantly influenced by a variety of factors such as high K+ concentration, sudden increases of ammonia, pH, and the concentration of SCFA. Impaired Mg2+ absorption in the rumen is not compensated for by increased transport in the small or large intestine. While renal excretion can be adjusted to compensate precisely for any surplus in Mg2+ uptake, a shortage in dietary Mg2+ cannot be compensated for either via skeletal mobilisation of Mg2+ or via up-regulation of ruminal absorption. In such situations, hypomagnesaemia will lead to decrease of a Mg2+ in the cerebrospinal fluid and clinical manifestations of tetany. Improved knowledge concerning the factors governing Mg2+ homeostasis will allow reliable recommendations for an adequate Mg2+ intake and for the avoidance of possible disturbances. Future research should clarify the molecular identity of the suggested Mg2+ transport proteins and the regulatory mechanisms controlling renal Mg excretion as parameters influencing Mg2+ homeostasis.
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McGuigan JA, Kay JW, Elder HY. Ionised concentrations in calcium and magnesium buffers: Standards and precise measurement are mandatory. PROGRESS IN BIOPHYSICS AND MOLECULAR BIOLOGY 2017; 126:48-64. [DOI: 10.1016/j.pbiomolbio.2017.03.001] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/17/2015] [Revised: 01/20/2016] [Accepted: 03/10/2016] [Indexed: 11/16/2022]
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Kutus B, Ozsvár D, Varga N, Pálinkó I, Sipos P. ML and ML2 complex formation between Ca(ii) and d-glucose derivatives in aqueous solutions. Dalton Trans 2017; 46:1065-1074. [DOI: 10.1039/c6dt04356a] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Besides the well-known ML species, Ca(ii) forms ML2 complexes with carbohydrates having at least one carboxylate group and conformational flexibility.
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Affiliation(s)
- Bence Kutus
- Department of Inorganic and Analytical Chemistry
- University of Szeged
- H-6720 Szeged
- Hungary
- Materials and Solution Structure Research Group
| | - Dániel Ozsvár
- Department of Inorganic and Analytical Chemistry
- University of Szeged
- H-6720 Szeged
- Hungary
- Materials and Solution Structure Research Group
| | - Norbert Varga
- Department of Inorganic and Analytical Chemistry
- University of Szeged
- H-6720 Szeged
- Hungary
- Materials and Solution Structure Research Group
| | - István Pálinkó
- Department of Organic Chemistry
- University of Szeged
- H-6720 Szeged
- Hungary
- Materials and Solution Structure Research Group
| | - Pál Sipos
- Department of Inorganic and Analytical Chemistry
- University of Szeged
- H-6720 Szeged
- Hungary
- Materials and Solution Structure Research Group
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McGuigan JAS, Kay JW, Elder HY. Ionised concentrations in calcium and magnesium buffers: Standards and precise measurement are mandatory. PROGRESS IN BIOPHYSICS AND MOLECULAR BIOLOGY 2016; 121:195-211. [PMID: 26975789 DOI: 10.1016/j.pbiomolbio.2016.03.002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/17/2015] [Revised: 01/20/2016] [Accepted: 03/10/2016] [Indexed: 06/05/2023]
Abstract
In Ca(2+) and Mg(2+) buffer solutions the ionised concentrations ([X(2+)]) are either calculated or measured. Calculated values vary by up to a factor of seven due to the following four problems: 1) There is no agreement amongst the tabulated constants in the literature. These constants have usually to be corrected for ionic strength and temperature. 2) The ionic strength correction entails the calculation of the single ion activity coefficient, which involves non-thermodynamic assumptions; the data for temperature correction is not always available. 3) Measured pH is in terms of activity i.e. pHa. pHa measurements are complicated by the change in the liquid junction potentials at the reference electrode making an accurate conversion from H(+) activity to H(+) concentration uncertain. 4) Ligands such as EGTA bind water and are not 100% pure. Ligand purity has to be measured, even when the [X(2+)] are calculated. The calculated [X(2+)] in buffers are so inconsistent that calculation is not an option. Until standards are available, the [X(2+)] in the buffers must be measured. The Ligand Optimisation Method is an accurate and independently verified method of doing this (McGuigan & Stumpff, Anal. Biochem. 436, 29, 2013). Lack of standards means it is not possible to compare the published [Ca(2+)] in the nmolar range, and the apparent constant (K(/)) values for Ca(2+) and Mg(2+) binding to intracellular ligands amongst different laboratories. Standardisation of Ca(2+)/Mg(2+) buffers is now essential. The parameters to achieve this are proposed.
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Affiliation(s)
- John A S McGuigan
- Medical, Veterinary and Life Sciences Faculty, University of Glasgow, G12 8QQ, UK.
| | - James W Kay
- Medical, Veterinary and Life Sciences Faculty, University of Glasgow, G12 8QQ, UK
| | - Hugh Y Elder
- Medical, Veterinary and Life Sciences Faculty, University of Glasgow, G12 8QQ, UK
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