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
This fact is not without effect on the activity thus measured (as discussed below) . Substrate Specifity The Hevea enzyme hydrolyzed ATP but also the four other ribonucleoside-triphosphates in the order of preference GTP > ITP > CTP > UTP (D'Auzac, 1977). This specificity has been confirmed with other tonoplast systems isolated from fungi and higher plants. However, an important degree hydrolysis of GTP and UTP was noted for sugarcane vacuoles (Thom et al, 1983). The occurrence of such broad specificity could be interpreted - if the hydrolysis was catalyzed by the same enzyme - as a feature of an unspecific nucleotide-phosphatase.
9). The e xoplasmic fracture (EF) face is quite uneven because it carries a mixture of p i ts and particles often associated in aggregates or in short rows. Fourty perc e nt of the total integral membrane proteins ar e prefer e ntially partitioned with the ' exoplasmic leafl e t of the lip id bilayer and occupy 16 % of the vacuole membrane area (Table 4). As computed from the shadowed replicas, many of these integral prot e ins could span the bilayer. The background matrix is made moderate ly rough by patches of small depressions.
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~. 1982). The phospholipid to protein ratio of the vacuole membrane from red beets (Marty and Branton 1980) is similar to that of yeast tonoplast (Kramer et al. 1978, Van der Wilden and Matile 1978), and of several plasma-niembranes from higher plants (Travis and Booz 1979, Yoshida and Uemura 1984).