Faculty and Student Publications
Document Type
Article
Publication Date
12-1-2020
Abstract
© 2020, The Author(s). The cation-independent mannose 6-phosphate receptor (CI-MPR, IGF2 receptor or CD222), is a multifunctional glycoprotein required for normal development. Through the receptor’s ability to bind unrelated extracellular and intracellular ligands, it participates in numerous functions including protein trafficking, lysosomal biogenesis, and regulation of cell growth. Clinically, endogenous CI-MPR delivers infused recombinant enzymes to lysosomes in the treatment of lysosomal storage diseases. Although four of the 15 domains comprising CI-MPR’s extracellular region bind phosphorylated glycans on lysosomal enzymes, knowledge of how CI-MPR interacts with ~60 different lysosomal enzymes is limited. Here, we show by electron microscopy and hydroxyl radical protein footprinting that the N-terminal region of CI-MPR undergoes dynamic conformational changes as a consequence of ligand binding and different pH conditions. These data, coupled with X-ray crystallography, surface plasmon resonance and molecular modeling, allow us to propose a model explaining how high-affinity carbohydrate binding is achieved through allosteric domain cooperativity.
Relational Format
journal article
Recommended Citation
Olson, L. J., Misra, S. K., Ishihara, M., Battaile, K. P., Grant, O. C., Sood, A., Woods, R. J., Kim, J.-J. P., Tiemeyer, M., Ren, G., Sharp, J. S., & Dahms, N. M. (2020). Allosteric regulation of lysosomal enzyme recognition by the cation-independent mannose 6-phosphate receptor. Communications Biology, 3(1), 498. https://doi.org/10.1038/s42003-020-01211-w
DOI
10.1038/s42003-020-01211-w