These tools will no longer be maintained as of December 31, 2024. Archived website can be found here. PubMed4Hh GitHub repository can be found here. Contact NLM Customer Service if you have questions.


Pubmed for Handhelds

PUBMED FOR HANDHELDS

Search MEDLINE/PubMed

  • Title: Spectroscopic studies on the interaction of riboflavin with bovine serum albumin.
    Author: Kamat BP, Seetharamappa J, Melwanki MB.
    Journal: Indian J Biochem Biophys; 2004 Aug; 41(4):173-8. PubMed ID: 22900349.
    Abstract:
    The mechanism of interaction of riboflavin (RF) with bovine serum albumin (BSA) using fluorometric and circular dichroism (CD) methods has been reported. The association constant (K) for RF-BSA binding shows that the interaction is non-covalent in nature. Stern-Volmer analysis of fluorescence quenching data shows that the fraction of fluorophore (BSA) accessible to the quencher (RF) is close to unity, indicating that both tryptophan residues of BSA are involved in the interaction. The high magnitude of rate constant for quenching kq (10(13) M(-1) s(-1) indicates that RF binding site is in close proximity to tryptophan residue of BSA. Thermodynamic parameters obtained from data at different temperatures showed that the binding of RF to BSA predominantly involves the formation of hydrophobic bonds. Binding studies in the presence of a hydrophobic probe 8-anilino-1-naphthalene sulphonic acid, sodium salt (ANS) showed that RF and ANS do not share common sites in BSA. The small decrease in critical micellar concentration of anionic surfactant, sodium dodecyl sulphate in the presence of RF shows that ionic character of RF also contributes to binding and is not solubilized inside the micelle. Significant decrease in concentration of free RF has been observed in the presence of paracetamol. The CD spectrum shows the binding of RF leads to a change in the alpha helical structure of BSA.
    [Abstract] [Full Text] [Related] [New Search]