Abstract
The wild silkworm Samia cynthia ricini produces silk fibroin containing polyalanine sequences. The structure of a typical tandem repeat sequence YGGDGG(A)12GGAG within S. c. ricini silk fibroin in liquid silk was determined by solution NMR. 13C, 15N, and 1H shifts were assigned from solution NMR spectra for the tandem repeat. TALOS-N was then used to predict the backbone dihedral angles from the chemical shifts. Dihedral angles revealed a well-structured α-helix for the polyalanine region and less stable capping motifs for the N- and C-terminal regions. Consistent with this, the amide proton temperature coefficients of the last glycine in the N-terminal region and the first two glycines in the C-terminal region show more positive values than that of a random coil structure. Thus, the α-helical structure of the polyalanine region of S. c. ricini liquid silk is stabilized by capping motifs.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.