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Structure of the lens MP20 mediated adhesive junction

biorxiv. 2024-05; 
William J Nicolas, Anna Shiriaeva, Michael W Martynowycz, Angus C Grey, Yasmeen Ruma, Paul J Donaldson, Tamir Gonen
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Proteins, Expression, Isolation and Analysis … the protein to homogeneity and successfully grew very small crystals of the protein embedded in … ) and detected by western blotting using HRP-conjugated anti-his antibody (Genscript). … Get A Quote

摘要

Human lens fiber membrane intrinsic protein MP20 is the second most abundant membrane protein of the human eye lens. Despite decades of effort its structure and function remained elusive. Here, we determined the MicroED structure of full-length human MP20 in lipidic-cubic phase to a resolution of 3.5 Å. MP20 forms tetramers each of which contain 4 transmembrane α-helices that are packed against one another forming a helical bundle. Both the N- and C- termini of MP20 are cytoplasmic. We found that each MP20 tetramer formed adhesive interactions with an opposing tetramer in a head-to-head fashion. These interactions were mediated by the extracellular loops of the protein. The dimensions of the MP20 adhesive jun... More

关键词

Lens membrane protein, MicroED, cryoEM, ion-beam milling, junction, lipidic cubic phase