Biophysical Characterization of a Riboflavin-conjugated Dendrimer Platform for Targeted Drug Delivery

Overview

Journal Biomacromolecules

Publisher American Chemical Society

Specialties Biochemistry
Biology
Molecular Biology

Date 2011 Dec 24

PMID 22191428

Citations 8

Authors

Amanda B Witte

Christine M Timmer

Jeremy J Gam

Seok Ki Choi

Mark M Banaszak Holl

Bradford G Orr

James R Baker

Kumar Sinniah

Affiliations

Soon will be listed here.

Abstract

The present study describes the biophysical characterization of generation-five poly(amidoamine) (PAMAM) dendrimers conjugated with riboflavin (RF) as a cancer-targeting platform. Two new series of dendrimers were designed, each presenting the riboflavin ligand attached at a different site (isoalloxazine at N-3 and d-ribose at N-10) and at varying ligand valency. Isothermal titration calorimetry (ITC) and differential scanning calorimetry (DSC) were used to determine the binding activity for riboflavin binding protein (RfBP) in a cell-free solution. The ITC data shows dendrimer conjugates have K(D) values of ≥ 465 nM on a riboflavin basis, an affinity ~93-fold lower than that of free riboflavin. The N-3 series showed greater binding affinity in comparison with the N-10 series. Notably, the affinity is inversely correlated with ligand valency. These findings are also corroborated by DSC, where greater protein-conjugate stability is achieved with the N-3 series and at lower ligand valency.

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