Phospholipid-Dependence of Plant UDP-Glucose Sterol beta-d-Glucosyl Transferase : IV. Reconstitution into Small Unilamellar Vesicles.

Abstract:

:The phospholipid dependence of the UDP-glucose sterol glucosyl transferase (UDPG-SGTase) from maize coleoptiles was previously demonstrated using the partially purified and highly delipidated enzyme, in the presence of the detergent Triton X-100 (P Ullmann, P Bouvier-Navé, P Benveniste [1987] Plant Physiol 85: 51-55). We now report the reconstitution of the enzyme activity into unilamellar lipid vesicles. This was achieved by adding phospholipids, sterols and beta-octylglucoside to the solubilized enzyme and passing the mixture through Sephadex G-50. The treatment led to almost complete removal of the detergents. The incorporation of UDPG-SGTase in the lipid vesicles was demonstrated by (a) coelution of the enzyme activity with the labeled lipid vesicles (average diameter: 260A) on a Sephacryl S-1000 column and (b) flotation experiments on metrizamide density gradients. Release of dithiobis-(2-nitro-benzoic acid) (DTNB) from DTNB-preloaded vesicles was very slow, indicating good membrane integrity of the vesicles. Treatment of the intact vesicles with the nonpermeant reagent p-chloro-mercuribenzene sulfonate led to more than 95% inactivation of the total enzyme activity, i.e. the activity measured in the presence of Triton X-100 at permeabilizing concentration. This suggests an outward orientation for the active site of the enzyme. Finally, the enzyme was incorporated into vesicles of various phospholipid compositions and the kinetic parameters of the reactions were determined. Our results clearly show that the reconstituted UDPG-SGTase activity is stimulated to a large extent by negatively charged phospholipids.

journal_name

Plant Physiol

journal_title

Plant physiology

authors

Ury A,Benveniste P,Bouvier-Navé P

doi

10.1104/pp.91.2.567

subject

Has Abstract

pub_date

1989-10-01 00:00:00

pages

567-73

issue

2

eissn

0032-0889

issn

1532-2548

journal_volume

91

pub_type

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