Download MendeleyA novel two-chain proteinase inhibitor generated by circularization of a multidomain precursor protein.
Lee, M.C., Scanlon, M.J., Craik, D.J., Anderson, M.A.(1999) Nat Struct Biol 6: 526-530
- PubMed: 10360353
- DOI: https://doi.org/10.1038/9293
- Primary Citation of Related Structures:
1QH2 - PubMed Abstract:
Female reproductive tissues of the ornamental tobacco amass high levels of serine proteinase inhibitors (PIs) for protection against pests and pathogens. These PIs are produced from a precursor protein composed of six repeats each with a protease reactive site. Here we show that proteolytic processing of the precursor generates five single-chain PIs and a remarkable two-chain inhibitor formed by disulfide-bond linkage of N- and C-terminal peptide fragments. Surprisingly, PI precursors adopt this circular structure regardless of the number of inhibitor domains, suggesting this bracelet-like conformation is characteristic of the widespread potato inhibitor II (Pot II) protein family.
Organizational Affiliation:
School of Biochemistry, La Trobe University, Bundoora, Victoria, Australia.
