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Small alterations in cobinamide structure considerably influence sGC activation.

Maciej Giedyk1, Keith ó Proinsias, Sylwester Kurcoń

  • 1Institute of Organic Chemistry PAS, Kasprzaka 44/52, 01-224 Warsaw (Poland), Fax: (+48) 22-632-6681.

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|July 22, 2014
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Summary

Modified cobalamin derivatives were synthesized to activate soluble guanylyl cyclase (sGC). Amide groups at specific positions significantly influenced sGC activation, especially in hydrophobic compounds, offering new therapeutic activation strategies.

Keywords:
aminolysiscGMPcobinamidessoluble guanylyl cyclasevitamin B12

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Area of Science:

  • Biochemistry
  • Medicinal Chemistry
  • Pharmacology

Background:

  • Soluble guanylyl cyclase (sGC) is a key enzyme in cellular signaling pathways.
  • Cobalamin derivatives are explored for their potential to modulate sGC activity.
  • Understanding structure-activity relationships is crucial for developing effective sGC activators.

Purpose of the Study:

  • To synthesize and evaluate novel B-ring-modified cobalamin derivatives as sGC activators.
  • To investigate the impact of substituents at the c- and d-positions of cobyrinic acid derivatives on sGC activation.
  • To compare the effects of structural modifications on both hydrophilic and hydrophobic cobalamin derivatives.

Main Methods:

  • Chemical synthesis of specifically designed B-ring-modified cobalamin derivatives.
  • Testing the synthesized compounds for their ability to activate soluble guanylyl cyclase (sGC).
  • Systematic variation of substituents at the c- and d-positions of cobyrinic acid scaffolds.

Main Results:

  • The presence of an amide group at the c-/d-position of cobyrinic acid derivatives significantly influences the level of sGC activation.
  • Removal of the d-position had a profound effect on the sGC activating capacity of hydrophobic cobalamin derivatives.
  • Hydrophilic cobalamin derivatives showed minimal changes in sGC activation upon removal of the d-position.

Conclusions:

  • B-ring modification of cobalamin derivatives, particularly with amide groups at c-/d-positions, can modulate sGC activation.
  • Hydrophobic cobalamin derivatives are more sensitive to structural changes at the d-position for sGC activation.
  • These findings provide insights into the rational design of novel sGC activators based on cobalamin scaffolds.