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Abstract
The metal hydration state within a designed coiled coil can be progressively tuned across the full integer range (3 → 0 aqua ligands), by careful choice of a second sphere terminal residue, including the lesser used Trp. Potential implications include a four-fold change in MRI relaxivity when applied to lanthanide coiled coils.
Highlights
The metal hydration state within a designed coiled coil can be progressively tuned across the full integer range (3 - 0 aqua ligands), by careful choice of a second sphere terminal residue, including the lesser used Trp
Despite the importance of second coordination sphere residues in molecular inorganic chemistry and biology, there has been no systematic study of second coordination sphere effects to control designed metal site hydration states beyond one water molecule within coiled coils
We recently reported the first example of a gadolinium coiled coil and its promising MRI relaxivity.[21]
Summary
The metal hydration state within a designed coiled coil can be progressively tuned across the full integer range (3 - 0 aqua ligands), by careful choice of a second sphere terminal residue, including the lesser used Trp. Potential implications include a four-fold change in MRI relaxivity when applied to lanthanide coiled coils. Despite the importance of second coordination sphere residues in molecular inorganic chemistry and biology, there has been no systematic study of second coordination sphere effects to control designed metal site hydration states beyond one water molecule within coiled coils.
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