The solution structure of concanavalin A probed by FT-IR spectroscopy

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Pages261268; # of pages: 8
SubjectFourier transform infrared spectroscopy; Concanavalin A; Protein secondary structure; Lectin
AbstractThe secondary structural properties of various forms of concanavalin A in solution were investigated by Fourier-transform infrared spectroscopy in the Amide I region. As in the crystal, the solution structure of the native protein consists mainly of antiparallel β-sheet. Carbohydrate binding does not produce major changes in the overall secondary structure of concanavalin A, but affects infrared bands due to loops and β-turns. Upon demetallization, the spectrum of concanavalin A shows only a small change in the Amide I band, indicating that whereas the β-sheet structure is conserved, the tertiary properties may be altered. There are also changes in the bands from the tyrosine residues which are compatible with local changes in structure. Confirming tertiary structural differences, the cation-depleted apoprotein is much less stable, denaturing around 63°C, while the native protein denatures only at temperatures around 85°C. Tetramerization proceeds without significant secondary structural change. However, aggregation of the tetramers leads to a significant decrease of the bands corresponding to β-sheet structure, and changes in the tyrosine bands.
Publication date
PublisherElsevier B.V.
AffiliationNRC Institute for Biological Sciences; National Research Council Canada
Peer reviewedYes
NRC numberARRONDO1988
NPARC number9362392
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Record identifierb4f839a8-fab0-4039-81ad-8f28964a5d8c
Record created2009-07-10
Record modified2016-12-22
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