Isolation of monomeric human V(H)s by a phage selection.
Human V(H) domains are promising molecules in applications involving antibodies, in particular, immunotherapy because of their human origin. However, they are, in general, prone to aggregation. Therefore, various strategies have been employed to acquire monomeric human V(H)s. We had previously discovered that filamentous phages displaying engineered monomeric V(H) domains gave rise to significantly larger plaques on bacterial lawns than phages displaying wild type V(H)s with aggregation tendencies. Using plaque size as the selection criterion and a phage-displayed naïve human V(H) library we identified 15 V(H)s that were monomeric. Additionally, the V(H)s demonstrated good expression yields, good refolding properties following thermal denaturation, resistance to aggregation during long incubation at 37 degrees C, and to trypsin at 37 degrees C. These 15 V(H)s should serve as good scaffolds for developing immunotherapeutics, and the selection method employed here should have general utility for isolating proteins with desirable biophysical properties.
To
Rebecca
R
Institute for Biological Sciences, National Research Council of Canada, Ottawa, Ontario K1A 0R6, Canada.
Hirama
Tomoko
T
Arbabi-Ghahroudi
Mehdi
M
MacKenzie
Roger
R
Wang
Ping
P
Xu
Ping
P
Ni
Feng
F
Tanha
Jamshid
J
D000595:Amino Acid Sequence; D001665:Binding Sites; D001703:Biophysics / Q000379:methods; D002850:Chromatography, Gel; D018076:DNA, Complementary / Q000378:metabolism; D015723:Gene Library; D006801:Humans; D007128:Immunoglobulin Fragments / Q000737:chemistry; D007135:Immunoglobulin Variable Region / Q000737:chemistry*; D007167:Immunotherapy / Q000379:methods; D017912:Inovirus / Q000378:metabolism; D007700:Kinetics; D008024:Ligands; D009682:Magnetic Resonance Spectroscopy; D008969:Molecular Sequence Data; D009154:Mutation; D019151:Peptide Library; D011485:Protein Binding; D011489:Protein Denaturation; D015202:Protein Engineering / Q000379:methods; D017510:Protein Folding; D017434:Protein Structure, Tertiary; D011522:Protons; D012333:RNA, Messenger / Q000378:metabolism; D017386:Sequence Homology, Amino Acid; D013696:Temperature; D013997:Time Factors; D014357:Trypsin / Q000737:chemistry
D018076:DNA, Complementary; D007128:Immunoglobulin Fragments; D007135:Immunoglobulin Variable Region; D008024:Ligands; D019151:Peptide Library; D011522:Protons; D012333:RNA, Messenger; D014357:Trypsin