13C NMR or coenzyme A and its constituent moieties

Area of Science:

• Biochemistry
• Organic Chemistry
• Spectroscopy

Background:

• Coenzyme A (CoA) is a vital metabolic cofactor involved in numerous biochemical reactions.
• Understanding the structure and conformation of CoA is crucial for elucidating its biological functions.
• Nuclear Magnetic Resonance (NMR) spectroscopy is a powerful tool for structural determination of biomolecules.

Purpose of the Study:

• To obtain and analyze natural abundance 13C NMR spectra for coenzyme A (CoA) and several related compounds.
• To assign the 13C chemical shifts within the NMR spectrum of CoA.
• To investigate the solution-state conformation of CoA.

Main Methods:

• Acquisition of natural abundance 13C Nuclear Magnetic Resonance (NMR) spectra in deuterium oxide (D2O).
• Analysis of spectra for pantoyl lactone, beta-alanine, cysteamine hydrochloride, cystamine dihydrochloride, calcium pantothenate, beta-aletheine oxalate, pantetheine, pantethine, pantetheine 4'-phosphate, oxypantetheine 4'-phosphate, desulfopantetheine 4'-phosphate, N-acetyl-aminodesthiopantetheine 4'-phosphate, adenosine 2',5'-diphosphate, adenosine 3',5'-diphosphate, and coenzyme A (CoA).
• Complete assignment of 13C chemical shifts for CoA.

Main Results:

• 13C NMR spectra were successfully obtained for all listed compounds, including CoA.
• A comprehensive assignment of 13C chemical shifts for coenzyme A (CoA) was achieved.
• Spectral comparisons indicated that CoA likely exists in an extended conformation in solution.

Conclusions:

• The study provides detailed 13C NMR spectral data for CoA and related molecules.
• The assignment of 13C chemical shifts aids in the structural characterization of CoA.
• The findings suggest an extended conformation for CoA in aqueous solution, offering insights into its molecular behavior.