Characterization of Folic Acid and Poly(amidoamine) Dendrimer Interactions with Folate Binding Protein: A Force-Pulling Study
Journal Article
·
· Journal of Physical Chemistry. B, Condensed Matter, Materials, Surfaces, Interfaces and Biophysical Chemistry
- Univ. of Michigan, Ann Arbor, MI (United States). Dept. of Chemistry
- Xavier Univ., New Orleans, LA (United States). Dept. of Chemistry
- Calvin College, Grand Rapids, MI (United States). Dept. of Chemistry & Biochemistry
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). Physical and Life Sciences Division
- Univ. of Michigan, Ann Arbor, MI (United States). Dept. of Physics
In this paper, atomic force microscopy force-pulling experiments have been used to measure the binding forces between folic acid (FA) conjugated poly(amidoamine) (PAMAM) dendrimers and folate binding protein (FBP). The generation 5 (G5) PAMAM conjugates contained an average of 2.7, 4.7, and 7.2 FA per dendrimer. The most probable rupture force was measured to be 83, 201, and 189 pN for G5-FA2.7, G5-FA4.7, and G5-FA7.2, respectively. Folic acid blocking experiments for G5-FA7.2 reduced the frequency of successful binding events and increased the magnitude of the average rupture force to 274 pN. Finally, the force data are interpreted as arising from a network of van der Waals and electrostatic interactions that form between FBP and G5 PAMAM dendrimer, resulting in a binding strength far greater than that expected for an interaction between FA and FBP alone.
- Research Organization:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Univ. of Michigan, Ann Arbor, MI (United States)
- Sponsoring Organization:
- USDOE; National Inst. of Health (NIH) (United States)
- Grant/Contract Number:
- AC52-07NA27344
- OSTI ID:
- 1458700
- Report Number(s):
- LLNL-JRNL--742632; 896737
- Journal Information:
- Journal of Physical Chemistry. B, Condensed Matter, Materials, Surfaces, Interfaces and Biophysical Chemistry, Journal Name: Journal of Physical Chemistry. B, Condensed Matter, Materials, Surfaces, Interfaces and Biophysical Chemistry Journal Issue: 35 Vol. 119; ISSN 1520-6106
- Publisher:
- American Chemical SocietyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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