Combining MALDI mass spectrometry and biomolecular interaction analysis using a biomolecular interaction analysis...

Area of Science:

• Biochemistry
• Analytical Chemistry
• Molecular Biology

Background:

• Biomolecular Interaction Analysis (BIA) using Biacore instruments quantifies surface-bound molecules.
• Identifying the precise molecular identity of bound analytes often requires complementary techniques.
• Mass spectrometry offers high sensitivity and specificity for molecular identification.

Purpose of the Study:

• To develop and validate a method for recovering affinity-bound molecules from a Biacore sensor chip.
• To combine BIA with Matrix-Assisted Laser Desorption/Ionization Mass Spectrometry (MALDI-MS) for comprehensive analysis.
• To enable accurate molecular mass determination of eluted analytes.

Main Methods:

• Integration of a Biacore instrument with MALDI-MS.
• Development of an elution protocol for recovering bound molecules from the sensor chip in microliter volumes.
• Analysis of antibody-antigen and DNA-protein interaction systems.

Main Results:

• Successful elution of femtomole quantities of affinity-bound proteins.
• Detection and accurate molecular mass determination of eluted proteins using MALDI-MS.
• Demonstration of combined BIA-MALDI-MS for quantifying surface-bound molecules.

Conclusions:

• The developed method enables the recovery and identification of affinity-bound molecules.
• Combining BIA and MALDI-MS provides both quantitative (surface concentration) and qualitative (molecular identity) data.
• This integrated approach allows for precise calculation of the total surface molar concentration of affinity-bound molecules.