title: Use of Spectroscopic Techniques to Reveal the Nature of the Interactions of Two Sialic Acid Specific Lectins with Gold Nanoparticles.
abstract: From UV-vis absorption, steady state and time resolved fluorescence measurements coupled with circular dichroism (CD) spectral studies, it was revealed that among the two lectins: Sambucus nigra agglutinin (SNA) and Saraca indica (saracin II), SNA forms stronger binding complex in the ground state with gold nanoparticles (GNPs). From the measurements of Stern-Volmer (SV) constants Ksv, and binding constants K(A) and number of binding sites two important inferences could be drawn. Firstly, the fluorescence quenching is primarily due to static quenching and secondly SNA forms stronger binding with GNPs relative to the other lectin saracin II. Synchronous fluorescence spectral measurements further substantiate this proposition of exhibiting the fully exposed tryptophan residue in case of SNA. It appears that the lectin SNA adopted a relatively looser conformation with the extended polypeptide structures leading to the exposure of the hydrophobic cavities which favoured stronger binding with GNPs. CD measurements demonstrate that gold nanoparticles when interact with the lectins (glycoproteins), no significant distortion in the structural pattern of the later occurs. The unaltered identity in the secondary structural pattern of both SNA and saracin II in presence of gold nanoparticles hints that GNPs may be used as useful drug or drug delivery systems.
authors.forename: Shuvendu
authors.initials: S
authors.lastname: Singha
authors.forename: Gopa
authors.initials: G
authors.lastname: Dutta
authors.forename: Partha P
authors.initials: PP
authors.lastname: Bose
authors.forename: Subrata
authors.initials: S
authors.lastname: Das
authors.forename: Munmun
authors.initials: M
authors.lastname: Bardhan
authors.forename: Bishnu P
authors.initials: BP
authors.lastname: Chatterjee
authors.forename: Tapan
authors.initials: T
authors.lastname: Ganguly
mesh_terms: D006046:Gold / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry*; D019158:N-Acetylneuraminic Acid / Q000737:chemistry*; D037121:Plant Lectins / Q000737:chemistry*; D027924:Sambucus nigra / Q000737:chemistry*; D013050:Spectrometry, Fluorescence
chemical_list: D037121:Plant Lectins; D006046:Gold; D019158:N-Acetylneuraminic Acid