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Publikācija: Diversified Structural Basis of a Conserved Molecular Mechanism for pH-Dependent Dimerization in Spider Silk N-Terminal Domains

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Publikācijas valoda English (en)
Nosaukums oriģinālvalodā Diversified Structural Basis of a Conserved Molecular Mechanism for pH-Dependent Dimerization in Spider Silk N-Terminal Domains
Pētniecības nozare 1. Dabaszinātnes
Pētniecības apakšnozare 1.4. Ķīmija
Autori Mārtiņš Otikovs
G. Chen
K. Nordling
M. Landreh
Q. Meng
H. Jörnvall
N. Kronqvist
A. Rising
J. Johansson
Kristaps Jaudzems
Atslēgas vārdi
Anotācija Conversion of spider silk proteins from soluble dope to insoluble fibers involves pH-dependent dimerization of the N-terminal domain (NT). This conversion is tightly regulated to prevent premature precipitation and enable rapid silk formation at the end of the duct. Three glutamic acid residues that mediate this process in the NT from Euprosthenops australis major ampullate spidroin 1 are well conserved among spidroins. However, NTs of minor ampullate spidroins from several species, including Araneus ventricosus (AvMiSp NT), lack one of the glutamic acids. Here we investigate the pH-dependent structural changes of AvMiSp NT, revealing that it uses the same mechanism but involves a non-conserved glutamic acid residue instead. Homology modeling of the structures of other MiSp NTs suggests that these harbor different compensatory residues. This indicates that, despite sequence variations, the molecular mechanism underlying pH-dependent dimerization of NT is conserved among different silk types.
DOI: 10.1002/cbic.201590036
Atsauce Otikovs, M., Chen, G., Nordling, K., Landreh, M., Meng, Q., Jörnvall, H., Kronqvist, N., Rising, A., Johansson, J., Jaudzems, K. Diversified Structural Basis of a Conserved Molecular Mechanism for pH-Dependent Dimerization in Spider Silk N-Terminal Domains. ChemBioChem, 2015, Vol.16, Iss.12, 1720.-1724.lpp. e-ISSN 1439-7633. Pieejams: doi:10.1002/cbic.201590036
ID 21248