Chapter 4. Synthetic Receptors for Small Organic and Inorganic Anions Stefan Kubik Fachbereich Chemie - Organische Chemie, Technische Universität Kaiserslautern,

Chapter 4. Synthetic Receptors for Small Organic and Inorganic Anions

Stefan Kubik

Fachbereich Chemie - Organische Chemie,

Technische Universität Kaiserslautern, Erwin-Schrödinger-Straße,

D-67663 Kaiserslautern, Germany

Email: [email protected]

Supplementary information for Synthetic Receptors for Biomolecules: Design Principles and Applications© The Royal Society of Chemistry 2015

Table 1 Ionic radii, enthalpies of solvation, Gibbs energies of solvation, and pKa values of selected inorganic anions.

a. Relative amount of the anion in water at pH 7.4 based on its pKa value. Other species present under these conditions are the protonated and/or deprotonated forms of the anion; b. not available.


Figure 4.1 Typical Hofmeister series for a selection of common inorganic anions. Note that the order depends on the experiment used to determine the anion effect, on the counterion, and on concentration, so that anions can sometimes exchange position in this series.


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Figure 4.2 Electrostatic potential surfaces of the four halides fluoride, chloride, bromide and iodide.


Figure 4.3 Binding arrangement of a chloride anion inside the narrowest pore region of the chloride ion channel from S. typhimurium (left) and schematic representation of the underlying interactions (right). The picture was generated by using VMD from the structure deposited in the RCSB Protein Data Bank (code 1KPL).


Figure 4.4 Examples of prodigiosins.


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Figure 4.5 Calculated structures of the sandwich type iodide complexes of receptors 4.35 (left) and 4.36, and crystal structure of the corresponding complex of 4.37 (right). Calculations were performed by the author by using Spartan 10 and the MMFF force-field. Hydrogen atoms except those on the NH groups are omitted for reasons of clarity.


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Figure 4.6 Electrostatic potential surfaces of the azide and the cyanide anion.


Figure 4.7 Coordination of the cyanide anion to the heme a3 and CuB centers of bovine cytochrome c oxidase (left) and schematic representation of the underlying interactions (right). The picture was generated by using VMD from the structure deposited in the RCSB Protein Data Bank (code 3AG4).


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Figure 4.8 Electrostatic potential surfaces of the nitrate, carbonate, and acetate anion.


Figure 4.9 Arrangement of L-N-(hydroxyaminocarbonyl)phenylalanine inside the binding site of carboxypeptidase A (left) and schematic representation of the underlying interactions (right). The picture was generated by using VMD from the structure deposited in the RCSB Protein Data Bank (code 1HEE).


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Figure 4.10 Electrostatic potential surfaces of the sulfate, phosphate, arsenate, and perchlorate anion.


Figure 4.11 Binding arrangement of a hydrogenphosphate anion inside the binding site of the phosphate-binding protein (PBP) (left) and schematic representation of the underlying interactions (right). The picture was generated by using VMD from the structure deposited in the RCSB Protein Data Bank (code 1IXH).


Figure 4.12 Binding arrangement of a sulfate anion inside the binding site of the sulfate-binding protein (SBP) from Salmonella typhimurium (left) and schematic representation of the underlying interactions (right). The picture was generated by using VMD from the structure deposited in the RCSB Protein Data Bank (code 1SBP).


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Chapter 4. Synthetic Receptors for Small Organic and Inorganic Anions Stefan Kubik Fachbereich Chemie - Organische Chemie, Technische Universität Kaiserslautern,