2lwv | pdb_00002lwv

NMR solution structure of PawS Derived Peptide 6 (PDP-6)

spinqualitylabelsall models 2lwv Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2lwv is a 1 chain structure. Full experimental information is available from OCA. For a guided tour on the structure components use FirstGlance. Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed The de novo evolution of proteins is now considered a frequented route for biological innovation, but the genetic and biochemical processes that lead to each newly created protein are often poorly documented. The common sunflower (Helianthus annuus) contains the unusual gene PawS1 (Preproalbumin with SFTI-1) that encodes a precursor for seed storage albumin; however, in a region usually discarded during albumin maturation, its sequence is matured into SFTI-1, a protease-inhibiting cyclic peptide with a motif homologous to unrelated inhibitors from legumes, cereals, and frogs. To understand how PawS1 acquired this additional peptide with novel biochemical functionality, we cloned PawS1 genes and showed that this dual destiny is over 18 million years old. This new family of mostly backbone-cyclic peptides is structurally diverse, but the protease-inhibitory motif was restricted to peptides from sunflower and close relatives from its subtribe. We describe a widely distributed, potential evolutionary intermediate PawS-Like1 (PawL1), which is matured into storage albumin, but makes no stable peptide despite possessing residues essential for processing and cyclization from within PawS1. Using sequences we cloned, we retrodict the likely stepwise creation of PawS1's additional destiny within a simple albumin precursor. We propose that relaxed selection enabled SFTI-1 to evolve its inhibitor function by converging upon a successful sequence and structure. Evolutionary origins of a bioactive peptide buried within Preproalbumin.,Elliott AG, Delay C, Liu H, Phua Z, Rosengren KJ, Benfield AH, Panero JL, Colgrave ML, Jayasena AS, Dunse KM, Anderson MA, Schilling EE, Ortiz-Barrientos D, Craik DJ, Mylne JS Plant Cell. 2014 Mar;26(3):981-95. doi: 10.1105/tpc.114.123620. Epub 2014 Mar 28. PMID:24681618 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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