Biochemistry and Function of Vacuolar by R. K. Salyaev (auth.), Dr. Bernard P. Marin (eds.)

By R. K. Salyaev (auth.), Dr. Bernard P. Marin (eds.)

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Extra resources for Biochemistry and Function of Vacuolar Adenosine-Triphosphatase in Fungi and Plants

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About 62 % of the total vacuole proteins, 70 % of non-dialyzable carbohydrates, and almost all of the phospholipids and sterols were recovered in the membrane fraction. 30, and thus shares some of the known characteristics of other intracellular membranes. 38 have been reported for thoroughly washed tonoplasts of the same Table 1. Gross composition of vacuole tissue* (from Marty and Branton 1980) Proteins (mg) 100 Phospholipids (mg) 58 Sterols (rng) 17,5 *Normalized to 100 mg of protein membra~e from beetroot storage Carbohydrates (mg) 79 Betanin (mg) trace 18 plant material (Salyaev £l~.

The carbohydrate 26 CYTOPLASM Fig. 11. see text Hypothetical model of the vacuole membrane. For details, chains of the glycoconjugates are envisionned as exoplasmic macromolecular extensions of the vacuole membrane . A schematic representation of the vacuole membrane is shown in Figure 11. New research avenues have been opened with the advent of techniques suitable for the isolation of purified vacuole membranes . Biochemical analysis of membrane fractions has made possible an inventory of the building blocks of the membrane.

These observations reveal the unique microenvironment at the exoplasmic surface of the vacuole membrane. Finally, colloidal gold particles coated with ConA have been incubated with unsealed fragments derived from the vacuole membrane of red beetroot. Because of the electron scattering properties of the gold we were able to demonstrate by standard thin sectioning techniques that the particles were attached to the exoplasmic surface of the vacuole membrane (Fig . 10) . Therefore, it has been concluded that the receptors for Con A and possibly for other lectins (WGA, RCA) are localized on the exoplasmic side of the vacuole membrane.

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