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Theoretical structures of MPO substrates built using Gd(III), which has a coordination number of 9. A, - A novel substrate bis-HTrp- DTPA(Gd) (substrate I) synthesized using L-5-hydroxytryptophan. B, - Bis-5HT-DTPA(Gd) (substrate II) synthesized using serotonin (5-hydroxytryptamide). This substrate is also known as MPO-Gd in the literature.2 C,-Hypothetical MPO reaction pathways leading to enzyme-generated products with higher relaxivity. R= paramagnetic moiety.
