4mli

Crystal structure of the SpyTag/SpyCatcher complex

spinqualitylabelsall models 4mli, resolution 2.10Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4mli is a 4 chain structure with sequence from Streptococcus pyogenes. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.1Å Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function Q8G9G1_STRPY Publication Abstract from PubMed Peptide tagging is a key strategy for observing and isolating proteins. However, the interactions of proteins with peptides are nearly all rapidly reversible. Proteins tagged with the peptide SpyTag form an irreversible covalent bond to the SpyCatcher protein via a spontaneous isopeptide linkage, thereby offering a genetically encoded way to create peptide interactions that resist force and harsh conditions. Here, we determined the crystal structure of the reconstituted covalent complex of SpyTag and SpyCatcher at 2.1A resolution. The structure showed the expected reformation of the beta-sandwich domain seen in the parental streptococcal adhesin, but flanking sequences at both N- and C-termini of SpyCatcher were disordered. In addition, only 10 out of 13 amino acids of the SpyTag peptide were observed to interact with SpyCatcher, pointing to specific contacts important for rapid split protein reconstitution. Based on these structural insights, we expressed a range of SpyCatcher variants and identified a minimized SpyCatcher, 32 residues shorter, that maintained rapid reaction with SpyTag. Together, these results give insight into split protein beta-strand complementation and enhance a distinct approach to ultrastable molecular interaction. Structural Analysis and Optimization of the Covalent Association between SpyCatcher and a Peptide Tag.,Li L, Fierer JO, Rapoport TA, Howarth M J Mol Biol. 2013 Oct 23. pii: S0022-2836(13)00666-9. doi:, 10.1016/j.jmb.2013.10.021. PMID:24161952 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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