Studies of interactions with weak affinities and low-molecular-weight compounds using surface plasmon resonance technology

✍ Scribed by Magnus Strandh; Björn Persson; Håkan Roos; Sten Ohlson

• Publisher: John Wiley and Sons
• Year: 1998
• Tongue: English
• Weight: 51 KB
• Volume: 11
• Category: Article
• ISSN: 0952-3499
• DOI: 10.1002/(sici)1099-1352(199812)11:1/6<188::aid-jmr420>3.0.co;2-o

✦ Synopsis

Interactions between the immobilized weak-affinity monoclonal IgG antibody 39.5, which is specific for the glucose-a1,4-glucose motif, and various oligosaccharides were studied with surface plasmon resonance technology. The antibody was immobilized at high levels on the surface of the sensor chip and different concentrations of the analytes were injected at 25 and 40 °C. The 39.5 antibody exhibited specific binding to maltose, tetraglucose and maltotriose, with dissociation constants K d in the range from 0.07 mM (25 °C) to 1.0 mM (40 °C). Association and dissociation rate constants (k a and k d ) were rapid and baseline was obtained almost immediately after the end of each antigen injection. This excluded the need for a regeneration step but also made calculation of the kinetic values impossible. Owing to the weak affinity and the small size of the analytes (`1000 Da), a careful design of control surfaces is demanded to exclude artefactual results.