Direct measurement of a tethered ligand-receptor interaction potential

Science

Volumn 275, Issue 5301, 1997, Pages 820-822

  Wong, Joyce Y ^a   Kuhl, Tonya L ^a   Israelachvili, Jacob N ^a   Mullah, Nasreen ^b   Zalipsky, Samuel ^b  

^a University of California at Santa Barbara   (United States)

^b ALZA CORPORATION   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

ARTICLE; BINDING AFFINITY; BINDING SITE; ELECTRIC POTENTIAL; LIGAND BINDING; PRIORITY JOURNAL; RECEPTOR BINDING;

BACTERIAL PROTEINS; BINDING SITES; BIOTIN; CHEMISTRY, PHYSICAL; LIGANDS; LIPID BILAYERS; MATHEMATICS; MODELS, CHEMICAL; MOLECULAR CONFORMATION; POLYETHYLENE GLYCOLS; STREPTAVIDIN;

EID: 0031016904     PISSN: 00368075     EISSN: None     Source Type: Journal    
DOI: 10.1126/science.275.5301.820     Document Type: Article

References (25)

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2. G. Blume et al., Biochim. Biophys. Acta 1149, 180 (1993); T. M. Allen, E. Brandeis, C. B. Hansen, G. Y. Kao, S. Zalipsky, ibid. 1237, 99 (1995); S. A. DeFrees, L. Phillips, L. Guo, S. Zalipsky, J. Am. Chem. Soc. 118, 6101 (1996); S. Zalipsky, B. Puntambekar, P. Boulikas, C. M. Engbers, M. C. Woodle, Bioconjugate Chem. 6, 705 (1995); R. J. Lee and P. S. Low, J. Biol. Chem. 269, 3198 (1994).
3. G. Blume et al., Biochim. Biophys. Acta 1149, 180 (1993); T. M. Allen, E. Brandeis, C. B. Hansen, G. Y. Kao, S. Zalipsky, ibid. 1237, 99 (1995); S. A. DeFrees, L. Phillips, L. Guo, S. Zalipsky, J. Am. Chem. Soc. 118, 6101 (1996); S. Zalipsky, B. Puntambekar, P. Boulikas, C. M. Engbers, M. C. Woodle, Bioconjugate Chem. 6, 705 (1995); R. J. Lee and P. S. Low, J. Biol. Chem. 269, 3198 (1994).
4. G. Blume et al., Biochim. Biophys. Acta 1149, 180 (1993); T. M. Allen, E. Brandeis, C. B. Hansen, G. Y. Kao, S. Zalipsky, ibid. 1237, 99 (1995); S. A. DeFrees, L. Phillips, L. Guo, S. Zalipsky, J. Am. Chem. Soc. 118, 6101 (1996); S. Zalipsky, B. Puntambekar, P. Boulikas, C. M. Engbers, M. C. Woodle, Bioconjugate Chem. 6, 705 (1995); R. J. Lee and P. S. Low, J. Biol. Chem. 269, 3198 (1994).
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9. 2OP, 1H).
10. J. Marra and J. Israelachvili, Methods Enzymol. 127, 353 (1986).
11. The surfaces jump in or out whenever the gradient of the force exceeds the mechanical restoring force (here, the spring constant of the apparatus).
12. The true potential is actually closer to a Langevin function and at 10% below full extension is likely to be larger than the parabolic potential. Although the freely hinged potential is more accurate, the quadratic form (Kramer's type approximation) is a good approximation for the following reasons: (i) the chains are barely overlapping, hence "brush effects" should be small; and (ii) the strongly stretched configurations make the chain interact even less with its neighbors.
13. 0.6a ≈ 43 Å for PEG-2000, where N is the number of monomer units and a is the length of a monomer unit.
14. G. I. Bell, Science 200, 618 (1978).
15. The force required to break a biotin-streptavidin bond is >130 pN [N. Green, Methods Enzymol. 184, 51 (1990); V. T. Moy, E.-L. Florin, H. E. Gaub, Science 266, 257 (1994)]. The force needed to pull out a PEG-lipid from a bilayer into water is ∼16kT or 23 pN {[G. Cevc and D. Marsh, Phospholipid Bilayers (Wiley, New York, 1987)]; critical micellar concentration of MPEG1900-DSPE ≈ 5.8 μM [P. S. Uster et al., FEBS Lett. 386, 243 (1996)]}.
16. The force required to break a biotin-streptavidin bond is >130 pN [N. Green, Methods Enzymol. 184, 51 (1990); V. T. Moy, E.-L. Florin, H. E. Gaub, Science 266, 257 (1994)]. The force needed to pull out a PEG-lipid from a bilayer into water is ∼16kT or 23 pN {[G. Cevc and D. Marsh, Phospholipid Bilayers (Wiley, New York, 1987)]; critical micellar concentration of MPEG1900-DSPE ≈ 5.8 μM [P. S. Uster et al., FEBS Lett. 386, 243 (1996)]}.
17. The force required to break a biotin-streptavidin bond is >130 pN [N. Green, Methods Enzymol. 184, 51 (1990); V. T. Moy, E.-L. Florin, H. E. Gaub, Science 266, 257 (1994)]. The force needed to pull out a PEG-lipid from a bilayer into water is ∼16kT or 23 pN {[G. Cevc and D. Marsh, Phospholipid Bilayers (Wiley, New York, 1987)]; critical micellar concentration of MPEG1900-DSPE ≈ 5.8 μM [P. S. Uster et al., FEBS Lett. 386, 243 (1996)]}.
18. The force required to break a biotin-streptavidin bond is >130 pN [N. Green, Methods Enzymol. 184, 51 (1990); V. T. Moy, E.-L. Florin, H. E. Gaub, Science 266, 257 (1994)]. The force needed to pull out a PEG-lipid from a bilayer into water is ∼16kT or 23 pN {[G. Cevc and D. Marsh, Phospholipid Bilayers (Wiley, New York, 1987)]; critical micellar concentration of MPEG1900-DSPE ≈ 5.8 μM [P. S. Uster et al., FEBS Lett. 386, 243 (1996)]}.
19. E. Evans and K. Ritchie, Biophys. J., in press.
20. J. Israelachvili, Intermolecular and Surface Forces (Academic Press, London, ed. 2, 1992).
21. Over biological time scales, the interaction was intrinsically irreversible and therefore a nonequilibrium one, where the interaction energy or force on approach was quite different from that on separation (compare with Fig. 3). Nonequilibrium effects are usually not discussed when considering complementary interactions. However, it is the energy or force on approach that determines the "on-rates" of binding reactions, whereas that on separation determines the "off-rate."
22. The particular dynamics or characteristic time of the tether coupled with the ligand receptor pair will ultimately determine the effective on- and off-rates.
23. See G. Cevc and D. Marsh, in (11).
24. D. E. Leckband, J. N. Israelachvili, F.-J. Schmitt, W. Knoll, Science 255, 1419 (1992).
25. We thank P. Pincus, G. Fredrickson, and C. Marques for valuable discussions and D. McLaren for preparing the figures. J.Y.W. was supported by an NIH/ National Research Service Award individual postdoctoral fellowship (GM17876). T.L.K. and J.N.I. were supported by NIH grant GM 47334.