Gas phase interaction of (L)-proline with Be2+, Mg2+ and Ca2+ ions

A computational study

G. J. Fleming, P. R. McGill, Hicham Idriss

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Geometry optimisation and metal ion affinities (MIAs) of the binding configurations of Be2+, Mg2+ and Ca2+ to (L)-proline were calculated using the hybrid Density Functional Theory (DFT-B3LYP) and second order Mollet-Plesset perturbation theory (MP2) methods. Be2+ was found to bind preferentially in a charge transfer type arrangement through the carbonyl oxygen (-C=O) and the lone pair of the imino-group nitrogen atom (-NH-). On the contrary Mg2+ and Ca2+ were found to prefer binding in a bi-dentate manner through the carboxylate group of L-proline (OCO) in a zwitterion form. The main types of interactions found to influence the binding preference Of M2+ ions to L-proline were (i) charge transfer in the case of Be2+ ions and (ii) electrostatic interactions in the case of Mg2+ and Ca2+ ions. Inspection of the IR stretching of the N-H and the O-H groups of (L)-proline with M2+ ions in a chelating configuration (to both O and N atoms) indicated a considerable shift to higher frequency with decreasing MIA. On the other hand, the MIA for the zwitterion L-proline with M2+ tracks the reciprocal distance of the M2+-OCO bond further confirming that the nature of the bond is mainly electrostatic. Comparison with other molecules containing the carboxylic function is also included in order to gain more insight on the types of interaction of this amino acid with metal ions in general.

Original languageEnglish
Pages (from-to)1032-1042
Number of pages11
JournalJournal of Physical Organic Chemistry
Volume20
Issue number12
Early online date22 Aug 2007
DOIs
Publication statusPublished - Dec 2007

Keywords

  • (L)-proline
  • metal ion affinity (MIF)
  • free energy (Delta G)
  • zwitterion structure
  • Ca2+
  • Mg2+
  • Be2+
  • infrared frequency
  • natural charge
  • DFIF B3LYP
  • MP2
  • alpha-amino-acids
  • metal-ion
  • infrared-spectroscopy
  • binding energies
  • ab-initio
  • kinetic method
  • proline
  • glycine
  • affinities
  • CU+

Cite this

Gas phase interaction of (L)-proline with Be2+, Mg2+ and Ca2+ ions : A computational study. / Fleming, G. J.; McGill, P. R.; Idriss, Hicham.

In: Journal of Physical Organic Chemistry, Vol. 20, No. 12, 12.2007, p. 1032-1042.

Research output: Contribution to journalArticle

Fleming, G. J. ; McGill, P. R. ; Idriss, Hicham. / Gas phase interaction of (L)-proline with Be2+, Mg2+ and Ca2+ ions : A computational study. In: Journal of Physical Organic Chemistry. 2007 ; Vol. 20, No. 12. pp. 1032-1042.
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abstract = "Geometry optimisation and metal ion affinities (MIAs) of the binding configurations of Be2+, Mg2+ and Ca2+ to (L)-proline were calculated using the hybrid Density Functional Theory (DFT-B3LYP) and second order Mollet-Plesset perturbation theory (MP2) methods. Be2+ was found to bind preferentially in a charge transfer type arrangement through the carbonyl oxygen (-C=O) and the lone pair of the imino-group nitrogen atom (-NH-). On the contrary Mg2+ and Ca2+ were found to prefer binding in a bi-dentate manner through the carboxylate group of L-proline (OCO) in a zwitterion form. The main types of interactions found to influence the binding preference Of M2+ ions to L-proline were (i) charge transfer in the case of Be2+ ions and (ii) electrostatic interactions in the case of Mg2+ and Ca2+ ions. Inspection of the IR stretching of the N-H and the O-H groups of (L)-proline with M2+ ions in a chelating configuration (to both O and N atoms) indicated a considerable shift to higher frequency with decreasing MIA. On the other hand, the MIA for the zwitterion L-proline with M2+ tracks the reciprocal distance of the M2+-OCO bond further confirming that the nature of the bond is mainly electrostatic. Comparison with other molecules containing the carboxylic function is also included in order to gain more insight on the types of interaction of this amino acid with metal ions in general.",
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T1 - Gas phase interaction of (L)-proline with Be2+, Mg2+ and Ca2+ ions

T2 - A computational study

AU - Fleming, G. J.

AU - McGill, P. R.

AU - Idriss, Hicham

PY - 2007/12

Y1 - 2007/12

N2 - Geometry optimisation and metal ion affinities (MIAs) of the binding configurations of Be2+, Mg2+ and Ca2+ to (L)-proline were calculated using the hybrid Density Functional Theory (DFT-B3LYP) and second order Mollet-Plesset perturbation theory (MP2) methods. Be2+ was found to bind preferentially in a charge transfer type arrangement through the carbonyl oxygen (-C=O) and the lone pair of the imino-group nitrogen atom (-NH-). On the contrary Mg2+ and Ca2+ were found to prefer binding in a bi-dentate manner through the carboxylate group of L-proline (OCO) in a zwitterion form. The main types of interactions found to influence the binding preference Of M2+ ions to L-proline were (i) charge transfer in the case of Be2+ ions and (ii) electrostatic interactions in the case of Mg2+ and Ca2+ ions. Inspection of the IR stretching of the N-H and the O-H groups of (L)-proline with M2+ ions in a chelating configuration (to both O and N atoms) indicated a considerable shift to higher frequency with decreasing MIA. On the other hand, the MIA for the zwitterion L-proline with M2+ tracks the reciprocal distance of the M2+-OCO bond further confirming that the nature of the bond is mainly electrostatic. Comparison with other molecules containing the carboxylic function is also included in order to gain more insight on the types of interaction of this amino acid with metal ions in general.

AB - Geometry optimisation and metal ion affinities (MIAs) of the binding configurations of Be2+, Mg2+ and Ca2+ to (L)-proline were calculated using the hybrid Density Functional Theory (DFT-B3LYP) and second order Mollet-Plesset perturbation theory (MP2) methods. Be2+ was found to bind preferentially in a charge transfer type arrangement through the carbonyl oxygen (-C=O) and the lone pair of the imino-group nitrogen atom (-NH-). On the contrary Mg2+ and Ca2+ were found to prefer binding in a bi-dentate manner through the carboxylate group of L-proline (OCO) in a zwitterion form. The main types of interactions found to influence the binding preference Of M2+ ions to L-proline were (i) charge transfer in the case of Be2+ ions and (ii) electrostatic interactions in the case of Mg2+ and Ca2+ ions. Inspection of the IR stretching of the N-H and the O-H groups of (L)-proline with M2+ ions in a chelating configuration (to both O and N atoms) indicated a considerable shift to higher frequency with decreasing MIA. On the other hand, the MIA for the zwitterion L-proline with M2+ tracks the reciprocal distance of the M2+-OCO bond further confirming that the nature of the bond is mainly electrostatic. Comparison with other molecules containing the carboxylic function is also included in order to gain more insight on the types of interaction of this amino acid with metal ions in general.

KW - (L)-proline

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KW - free energy (Delta G)

KW - zwitterion structure

KW - Ca2+

KW - Mg2+

KW - Be2+

KW - infrared frequency

KW - natural charge

KW - DFIF B3LYP

KW - MP2

KW - alpha-amino-acids

KW - metal-ion

KW - infrared-spectroscopy

KW - binding energies

KW - ab-initio

KW - kinetic method

KW - proline

KW - glycine

KW - affinities

KW - CU+

U2 - 10.1002/poc.1249

DO - 10.1002/poc.1249

M3 - Article

VL - 20

SP - 1032

EP - 1042

JO - Journal of Physical Organic Chemistry

JF - Journal of Physical Organic Chemistry

SN - 0894-3230

IS - 12

ER -