We developed an in vitro protein expression and interaction analysis platform based on a highly parallel and sensitive microfluidic affinity assay, and used it for 14,792 on-chip experiments, which exhaustively measured the protein-protein interactions of 43 Streptococcus pneumoniae proteins in quadruplicate. The resulting network of 157 interactions was denser than expected based on known networks. Analysis of the network revealed previously undescribed physical interactions among members of some biochemical pathways.
Bibliographical noteFunding Information:
We thank members of the Stanford microfluidics foundry for help with device fabrication. This work was supported in part by the US National Institutes of Health Director’s Pioneer award (to S.R.Q.) and a Fulbright award (to D.G.).