Crystal structure of Hyp-1, a St. John's wort protein implicated in the biosynthesis of hypericinMichalska, K., Fernandes, H., Sikorski, M.M., Jaskolski, M.
(2010) J.Struct.Biol. 169: 161-171
- PubMed: 19853038
- DOI: 10.1016/j.jsb.2009.10.008
- Also Cited By: 5I8F, 4GY9, 3RWS
- PubMed Abstract:
- Crystallization and preliminary crystallographic studies of Hyp-1, a St John's wort protein implicated in the biosynthesis of hypericin
Fernandes, H.,Konieczna, M.,Kolodziejczyk, R.,Bujacz, G.,Sikorski, M.M.,Jaskolski, M.
(2008) Acta Crystallogr.,Sect.F 64: 405
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- X-ray and NMR structure of Bet v 1, the origin of birch pollen allergy
Gajhede, M.,Osmark, P.,Poulsen, F.M.,Ipsen, H.,Larsen, J.N.,Joost van Neerven, R.J.,Schou, C.,Lowenstein, H.,Spangfort, M.D.
(1996) Nat.Struct.Mol.Biol. 3: 1040
- Crystal structures of two homologous pathogenesis-related proteins from yellow lupine
Biesiadka, J.,Bujacz, G.,Sikorski, M.M.,Jaskolski, M.
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- Crystal structure of Vigna radiata cytokinin-specific binding protein in complex with zeatin
Pasternak, O.,Bujacz, G.D.,Fujimoto, Y.,Hashimoto, Y.,Jelen, F.,Otlewski, J.,Sikorski, M.M.,Jaskolski, M.
(2006) Plant Cell 18: 2622
- Cytokinin-induced structural adaptability of a Lupinus luteus PR-10 protein
Fernandes, H.,Bujacz, A.,Bujacz, G.,Jelen, F.,Jasinski, M.,Kachlicki, P.,Otlewski, J.,Sikorski, M.M.,Jaskolski, M.
(2009) Febs J. 276: 1596
- Structure of a yellow lupin pathogenesis-related PR-10 protein belonging to a novel subclass
Pasternak, O.,Biesiadka, J.,Dolot, R.,Handschuh, L.,Bujacz, G.,Sikorski, M.M.,Jaskolski, M.
(2005) Acta Crystallogr.,Sect.D 61: 99
Hypericin, a red-colored naphtodianthrone, is a natural product synthesized in the medicinal plant Hypericum perforatum, widely known as St. John's wort. Hypericin has been attracting a growing attention of the pharmaceutical industry because of its ...
Hypericin, a red-colored naphtodianthrone, is a natural product synthesized in the medicinal plant Hypericum perforatum, widely known as St. John's wort. Hypericin has been attracting a growing attention of the pharmaceutical industry because of its potential application in various therapies, including the treatment of depression. In vivo, hypericin is synthesized by dimerization of emodin in a complicated multistep reaction that is reportedly catalyzed by a small (17.8kDa) protein, Hyp-1. Based on relatively low sequence similarity ( approximately 50%), Hyp-1 has been tentatively classified as a plant PR-10 (pathogenesis-related class 10) protein. Members of the PR-10 family are ubiquitous plant proteins associated with stress control and tissue differentiation but with no clearly understood molecular mechanism. They have, however, a well-defined folding canon, consisting of an extended antiparallel beta-sheet wrapped around a C-terminal alpha-helix, enclosing in the protein interior a huge cavity, in which various hydrophobic ligands can be bound. Apart from Hyp-1, only two other PR-10 members have been found to possess enzymatic activity (S-norcoclaurine synthase and TcmN aromatase/cyclase). In this paper, we report a high-resolution crystal structure of Hyp-1, confirming that it indeed has a PR-10 fold. The protein binds multiple polyethylene glycol molecules, some of which occupy the hydrophobic cavity. The crystallographic model illustrates a high degree of conformational adaptability of both interacting partners for efficient binding. We have been unable, however, to dimerize emodin to hypericin using Hyp-1 as biocatalyst. This puzzling result does not have a clear explanation at this time.
Department of Crystallography, Faculty of Chemistry, A. Mickiewicz University, Poznan, Poland.