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Volumn 12, Issue 31, 2006, Pages 8106-8122

Acid - Base and metal-ion-binding properties of xanthosine 5′-monophosphate (XMP) in aqueous solution: Complex stabilities, isomeric equilibria, and extent of macrochelation

Author keywords

Alkaline earth metals; Bioinorganic chemistry; Chelates; Isomers; Nucleotides; Transition metals; Xanthosinate

Indexed keywords

ACIDITY; COMPLEXATION; ISOMERS; METABOLISM; NUCLEIC ACIDS; TRANSITION METALS;

EID: 33750541655     PISSN: 09476539     EISSN: 15213765     Source Type: Journal    
DOI: 10.1002/chem.200600160     Document Type: Article
Times cited : (18)

References (95)
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    • (1995) Bioanorganische Chemie , pp. 341
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    • (compiled by L. D. Pettit, H. K. J. Powell), Academic Software, Timble, Otley, West Yorkshire (UK)
    • IUPAC Stability Constants Database, Release 5, Version 5.16 (compiled by L. D. Pettit, H. K. J. Powell), Academic Software, Timble, Otley, West Yorkshire (UK), 2001.
    • (2001) IUPAC Stability Constants Database, Release 5, Version 5.16
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    • (data collected and selected by R. M. Smith, A. E. Martell), US Department of Commerce, National Institute of Standards and Technology: Gaithersburg, MD (USA)
    • NIST Critically Selected Stability Constants of Metal Complexes, Reference Database 46, Version 6.0 (data collected and selected by R. M. Smith, A. E. Martell), US Department of Commerce, National Institute of Standards and Technology: Gaithersburg, MD (USA), 2001.
    • (2001) NIST Critically Selected Stability Constants of Metal Complexes, Reference Database 46, Version 6.0
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    • (joint venture by K. Murray, P. M. May), Division of Water Technology, CSIR, Pretoria (South Africa) and School of Mathematical and Physical Sciences, Murdoch University, Murdoch (Western Australia)
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    • Note added in proof: See, for example, R. A. Alberty, Biophys. Chem. 2006, 127, 157-162.
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  • 32
    • 33750568129 scopus 로고    scopus 로고
    • note
    • XMP·H = 1.11 ± 0.08, is certainly a reliable estimate (for details see reference [7] and also note [53] vide infra).
  • 40
    • 33750548994 scopus 로고    scopus 로고
    • note
    • a values measured; because this would allow an exact calculation of the concentration of the various tautomers.
  • 59
    • 33750570598 scopus 로고    scopus 로고
    • note
    • 2+; in fact, this situation corresponds to the one considered here.
  • 60
    • 33750566200 scopus 로고    scopus 로고
    • note
    • These constants are listed in a footnote to Table 9 on page 164 of ref. [21b].
  • 61
    • 33750565981 scopus 로고    scopus 로고
    • note
    • a differences of the indicated kind have no effect within the given error limits on the listed log stability constants.
  • 77
    • 33750567696 scopus 로고    scopus 로고
    • note
    • - group was estimated as 0.7±0.2 log units (see footnote [44] of reference [60b] and footnote [2] of reference [68]).
  • 82
    • 33750568126 scopus 로고    scopus 로고
    • note
    • Due to discussions with colleagues we add that one might argue that in Equation (31) a statistical factor should be introduced, because once one of the monodentate ligands has coordinated to a metal ion then the second monodentate ligand finds a lower number of binding sites available at the metal ion. However, we prefer to ignore statistical effects for principle reasons (see below), though this would also be justified due to the smallness of the effect: The first coordinating ligand has six possibilities for binding at an octahedral coordinating sphere, whereas the second ligand has only five because one is already occupied; this statistical factor of 5/6 amounts to 0.08 log unit which should be deducted from the result obtained for the term at the right in Equation (29b) making log Chelate [Eq. (31)] a bit larger. Inspection of the results listed in column 9 of Table 7 shows that this effect is within the given error limits anyway. More importantly, we argue against the use of a statistical effect for principle reasons: Assuming that no chelate is formed but that both sites may bind a metal ion independently in a monodentate fashion, then the total (analytical) concentration of ML is simply given by the sum of the concentrations of the two individual isomers; clearly, statistics do not play a role here.
  • 89
  • 93
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    • See also the comment in the footnote on page 258 in: M. Bastian, H. Sigel, Inorg. Chim. Acta 1990, 178, 249-259.
    • (1990) Inorg. Chim. Acta , vol.178 , pp. 249-259
    • Bastian, M.1    Sigel, H.2


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.