5yrj | pdb_00005yrj

PPL3B-isomaltose complex

spinqualitylabelsall models 5yrj, resolution 1.80Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 5yrj is a 2 chain structure with sequence from Pteria penguin. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: BGC, GLC, SO4 NonStd Res: PCA Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed The nacreous layer of pearl oysters is one of the major biominerals of commercial and industrial interest. Jacalin-related lectins, including PPL3 isoforms, are known to regulate biomineralization of the Pteria penguin pearl shell, although the molecular mechanisms are largely unknown. The PPL3 crystal structures were determined partly by utilizing microgravity environments for 3 isoforms, namely, PPL3A, PPL3B, and PPL3C. The structures revealed a tail-to-tail dimer structure established by forming a unique inter-subunit disulfide bond at C-termini. The N-terminal residues were found in pyroglutamate form, and this was partly explained by the post-translational modification of PPL3 isoforms implied from the discrepancy between amino acid and gene sequences. The complex structures with trehalose and isomaltose indicated that the novel specificity originated from the unique alpha-helix of PPL3 isoforms. Docking simulations of PPL3B to various calcite crystal faces suggested the edge of a beta-sheet and the carbohydrate-binding site rich in charged residues were the interface to the biomineral, and implied that the isoforms differed in calcite interactions. Structures of jacalin-related lectin PPL3 regulating pearl shell biomineralization.,Nakae S, Shionyu M, Ogawa T, Shirai T Proteins. 2018 Jun;86(6):644-653. doi: 10.1002/prot.25491. Epub 2018 Mar 23. PMID:29524263 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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