TY - JOUR
T1 - Design and use of multi-affinity surfaces in biomolecular interaction analysis-mass spectrometry (BIA/MS)
T2 - A step toward the design of SPR/MS arrays
AU - Nedelkov, Dobrin
AU - Nelson, Randall W.
PY - 2003/1
Y1 - 2003/1
N2 - The feasibility of multi-affinity ligand surfaces in biomolecular interaction analysis-mass spectrometry (BIA/MS) was explored in this work. Multi-protein affinity surfaces were constructed by utilizing antibodies to beta-2-microglobulin, cystatin C, retinol binding protein, transthyretin, serum amyloid P and C-reactive protein. In the initial experiments, all six antibodies were immobilized on a single site (flow cell) on the sensor chip surface, followed by verification of the surface activity via separate injections of purified proteins. After an injection of diluted human plasma aliquot over the antibodies-derivatized surfaces, and subsequent MALDI-TOF MS analysis, signals representing five out of the six targeted proteins were observed in the mass spectra. Further, to avoid the complexity of the spectra, the six proteins were divided into two groups (according to their molecular weight) and immobilized on two separate surfaces on a single sensor chip, followed by an injection of human plasma aliquot. The resulting mass spectra showed signals from all proteins. Also, the convolution resulting from the multiply charged ion species was eliminated. The ability to create such multi-affinity surfaces indicates that smaller-size ligand areas/spots can be employed in the BIA/MS protein interaction screening experiments, and opens up the possibilities for construction of novel multi-arrayed SPR-MS platforms and methods for high-throughput parallel protein interaction investigations.
AB - The feasibility of multi-affinity ligand surfaces in biomolecular interaction analysis-mass spectrometry (BIA/MS) was explored in this work. Multi-protein affinity surfaces were constructed by utilizing antibodies to beta-2-microglobulin, cystatin C, retinol binding protein, transthyretin, serum amyloid P and C-reactive protein. In the initial experiments, all six antibodies were immobilized on a single site (flow cell) on the sensor chip surface, followed by verification of the surface activity via separate injections of purified proteins. After an injection of diluted human plasma aliquot over the antibodies-derivatized surfaces, and subsequent MALDI-TOF MS analysis, signals representing five out of the six targeted proteins were observed in the mass spectra. Further, to avoid the complexity of the spectra, the six proteins were divided into two groups (according to their molecular weight) and immobilized on two separate surfaces on a single sensor chip, followed by an injection of human plasma aliquot. The resulting mass spectra showed signals from all proteins. Also, the convolution resulting from the multiply charged ion species was eliminated. The ability to create such multi-affinity surfaces indicates that smaller-size ligand areas/spots can be employed in the BIA/MS protein interaction screening experiments, and opens up the possibilities for construction of novel multi-arrayed SPR-MS platforms and methods for high-throughput parallel protein interaction investigations.
KW - Array
KW - BIA/MS
KW - Biosensor
KW - Chip
KW - Ligands
KW - MALDI-TOF mass spectrometry
KW - Multi-affinity
KW - SPR
KW - Surface
UR - http://www.scopus.com/inward/record.url?scp=0037271476&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0037271476&partnerID=8YFLogxK
U2 - 10.1002/jmr.601
DO - 10.1002/jmr.601
M3 - Article
C2 - 12557234
AN - SCOPUS:0037271476
SN - 0952-3499
VL - 16
SP - 15
EP - 19
JO - Journal of Molecular Recognition
JF - Journal of Molecular Recognition
IS - 1
ER -