Structure of gamma-conglutin: insight into the quaternary structure of 7S basic globulins from legumes.Czubinski, J., Barciszewski, J., Gilski, M., Szpotkowski, K., Debski, J., Lampart-Szczapa, E., Jaskolski, M.
(2015) Acta Crystallogr D Biol Crystallogr 71: 224-238
- PubMed: 25664733
- DOI: 10.1107/S1399004714025073
- Primary Citation of Related Structures:
- PubMed Abstract:
- Characterisation of different digestion susceptibility of lupin seed globulins.
Czubinski, J., Dwiecki, K., Siger, A., Neunert, G., Lampart-Szczapa, E.
(2014) Food Chem 143: 418
- Release of flavonoids from lupin globulin proteins during digestion in a model system.
Czubinski, J., Dwiecki, K., Siger, A., Kachlicki, P., Neunert, G., Lampart-Szczapa, E., Nogala-Kalucka, M.
(2012) J Agric Food Chem 60: 1830
- Crystal structure of basic 7S globulin, a xyloglucan-specific endo-beta-1,4-glucanase inhibitor protein-like protein from soybean lacking inhibitory activity against endo-beta-glucanase.
Yoshizawa, T., Shimizu, T., Yamabe, M., Taichi, M., Nishiuchi, Y., Shichijo, N., Unzai, S., Hirano, H., Sato, M., Hashimoto, H.
(2011) FEBS J 278: 1944
- Internalisation and multiple phosphorylation of gamma-Conglutin, the lupin seed glycaemia-lowering protein, in HepG2 cells.
Capraro, J., Magni, C., Faoro, F., Maffi, D., Scarafoni, A., Tedeschi, G., Maffioli, E., Parolari, A., Manzoni, C., Lovati, M.R., Duranti, M.
(2013) Biochem Biophys Res Commun 437: 648
- Lupin seed gamma-conglutin lowers blood glucose in hyperglycaemic rats and increases glucose consumption of HepG2 cells.
Lovati, M.R., Manzoni, C., Castiglioni, S., Parolari, A., Magni, C., Duranti, M.
(2012) Br J Nutr 107: 67
γ-Conglutin from lupin seeds is an unusual 7S basic globulin protein. It is capable of reducing glycaemia in mammals, but the structural basis of this activity is not known. γ-Conglutin shares a high level of structural homology with glycoside hydrolase inhibitor proteins, although it lacks any kind of inhibitory activity against plant cell-wall degradation enzymes ...
γ-Conglutin from lupin seeds is an unusual 7S basic globulin protein. It is capable of reducing glycaemia in mammals, but the structural basis of this activity is not known. γ-Conglutin shares a high level of structural homology with glycoside hydrolase inhibitor proteins, although it lacks any kind of inhibitory activity against plant cell-wall degradation enzymes. In addition, γ-conglutin displays a less pronounced structural similarity to pepsin-like aspartic proteases, but it is proteolytically dysfunctional. Only one structural study of a legume 7S basic globulin, that isolated from soybean, has been reported to date. The quaternary assembly of soybean 7S basic globulin (Bg7S) is arranged as a cruciform-shaped tetramer comprised of two superposed dimers. Here, the crystal structure of γ-conglutin isolated from Lupinus angustifolius seeds (LangC) is presented. The polypeptide chain of LangC is post-translationally cleaved into α and β subunits but retains its covalent integrity owing to a disulfide bridge. The protomers of LangC undergo an intricate quaternary assembly, resulting in a ring-like hexamer with noncrystallographic D3 symmetry. The twofold-related dimers are similar to those in Bg7S but their assembly is different as a consequence of mutations in a β-strand that is involved in intermolecular β-sheet formation in γ-conglutin. Structural elucidation of γ-conglutin will help to explain its physiological role, especially in the evolutionary context, and will guide further research into the hypoglycaemic activity of this protein in humans, with potential consequences for novel antidiabetic therapies.
Center for Biocrystallographic Research, Institute of Bioorganic Chemistry, Polish Academy of Sciences, Poznan, Poland.