Selective neoglycosylation increases the structural stability of vicilin, the 7S storage globulin from pea seeds.

Abstract:

:The effects of glycosylation on the stability and subunit interactions of vicilin, the major storage protein in pea seeds, were investigated. Glycosylated vicilin derivatives were prepared by alkylation of lysine epsilon-amino groups with various carbohydrates. Average modification levels of 13.4 +/- 3.0, 11.1 +/- 3.6, 7.5 +/- 4.2, and 4.7 +/- 0.3 moles of carbohydrate/mol of vicilin were obtained with glucose, galactose, galacturonic acid, and lactose, respectively. Nondenaturing polyacrylamide gel electrophoresis and size-exclusion chromatography indicated that the quaternary structure and hydrodynamic radius of vicilin were not affected by glycosylation at the levels used. We have previously shown that application of hydrostatic pressure causes dissociation of vicilin subunits [C. Pedrosa and S. T. Ferreira (1994) Biochemistry 33, 4046-4055]. Analysis of pressure dissociation data allowed determination of the Gibbs free energy change (deltaG(diss)) and molar volume change (deltaV(diss)) of dissociation of vicilin subunits. For unmodified vicilin, deltaG(diss) = 18.2 kcal/mol and deltaV(diss) = -102 ml/mol. Glycosylated vicilin derivatives were significantly stabilized against subunit dissociation, with deltaG(diss) of 19.4, 19.2, 20.6, and 22.1 kcal/mol for glucose, galactose, lactose, and galacturonic acid derivatives, respectively. No changes in deltaV(diss) were found for the glucose and galactose derivatives, whereas deltaV(diss) of -128 and -135 ml/mol, respectively, were found for the lactose and galacturonic acid derivatives. The glycosylated derivatives also appeared more resistant to unfolding by guanidine hydrochloride than unmodified vicilin. Intrinsic fluorescence lifetime measurements showed that glycosylation caused a significant increase in heterogeneity of the fluorescence decay, possibly reflecting increased conformational heterogeneity of glycosylated derivatives relative to unmodified vicilin. These results indicate that the stability and subunit interactions of vicilin may be modulated by mild, selective glycosylation at low modification levels, an effect that may be of interest in the study of other oligomeric proteins.

journal_name

Arch Biochem Biophys

authors

Pedrosa C,De Felice FG,Trisciuzzi C,Ferreira ST

doi

10.1006/abbi.2000.2024

subject

Has Abstract

pub_date

2000-10-15 00:00:00

pages

203-10

issue

2

eissn

0003-9861

issn

1096-0384

pii

S0003-9861(00)92024-1

journal_volume

382

pub_type

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