Abstract
Interaction of small molecules with collagen has far reaching consequences in biological and industrial processes. The interaction between collagen and selected polyphenols viz., Gallic acid (GA), Pyrogallol (PG), Catechin (CA) and Epigallocatechin gallate (EGCG) has been investigated by various solution NMR measurements viz., 1H and 13C chemical shifts (?H and ?C), 1H non-selective spin-lattice relaxation times (T1NS) and selective spin-lattice relaxation times (T1SEL) as well as spin-spin relaxation times (T2). Furthermore, we have employed saturation transfer difference (STD) NMR method to monitor the site of GA, CA, PG and EGCG which are in close proximity to collagen. It is found that -COOH group of GA provides an important contribution for the interaction of GA with collagen, as evidenced from 13C analysis, while PG, which is devoid of -COOH group in comparison to GA, does not show any significant interaction with collagen. STD NMR data indicates that the resonances of A-ring (H2?, H5? and H6?) and C-ring (H6 and H8) protons of CA, and A-ring (H2? and H6?), C-ring (H6 and H8) and D-ring (H2??and H6??) protons of EGCG persist in the spectra, demonstrating that these protons are in spatial proximity to collagen, which is further validated by independent proton spin-relaxation measurement and analysis. The selective 1H T1 measurments of polyphenols in the presence of protein at various concentrations have enabled us to determine their binding affinities with collagen. EGCG exhbits high binding affinity with collagen followed by CA, GA and PG. Further, NMR results propose that presence of gallic acid moity in a small molecule increases its affinity with collagen. Our experimental findings provide molecular insights on the binding of collagen and plant polyphenols.
PMID: 26447653 [PubMed - as supplied by publisher]
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Abstract
The binding affinity and specificity of heparin to proteins is widely recognized to be sulfation-pattern dependent. However, for the majority of heparin-binding proteins (HBPs), it still remains...
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[Question from NMRWiki Q&A forum] Saturation transfer difference TROSY
Saturation transfer difference TROSY
Has anyone added a pulse scheme for cross saturation to their TROSY for Bruker platform?
Could you share a pulse sequence if you have one?
Thanks!
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05-18-2013 09:22 AM
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Linear Mode
