Most of the studies on yeast invertase have been concerned only with the external enzyme (a mannan protein which is localized in the cell wall), but recently it has been reported that the invertase inside the cytoplasmic membrane is a smaller form. This paper presents a comparative study of the distribution of invertase isozymes in two stains of yeast and, after the selection of the best condit...

Polyphenoloxidase from grape berries is extracted only by nonionic detergents with a hydrophilic-lipophilic balance between 12.4 and 13.5. The enzyme was partially purified in latent form, free of phenolics and chlorophylls, by using temperature phase partitioning in a solution of Triton X-114. This method permits the purification of the enzyme with the same fold purification as the commonly us...

Most of the studies on yeast invertase have been concerned only with the external enzyme (a mannan protein which is localized in the cell wall), but recently it has been reported that the invertase inside the cytoplasmic membrane is a smaller form. This paper presents a comparative study of the distribution of invertase isozymes in two stains of yeast and, after the selection of the best condit...

The purification of chitin deacetylase from Mucor rouxii to homogeneity employing conventional methods has already been described. However, a lengthy protocol is required resulting in a low yield and specific activity for the enzyme . A 169-fold one-step purification of chitin deacetylase by immunoaffinity chromatography is reported, resulting in a homogeneous enzyme preparation. The enzyme pur...

Previously, a purification procedure for citrate lyase (EC 4.1.3.6) of Rhodopseudomonas gelathosa has been described [l] which because of the instability of the enzyme in some purification steps and of the low yields is not suited for the preparation of large amounts of citrate lyase. In connection with studies on the enzymes which modify citrate lyase by acetylation or deacetylation [2,3] it w...

In this article, I reflect on research on two ATPases. The first is F(1)F(0)-ATPase, also known as ATP synthase. It is the terminal enzyme in oxidative phosphorylation and famous as a nanomotor. Early work on mitochondrial enzyme involved purification in large amount, followed by deduction of subunit composition and stoichiometry and determination of molecular sizes of holoenzyme and individual...

severe problem: when they are able to degrade a membrane structure, the structure of a membranebound enzyme may be altered simultaneously. This may result not simply in an inactivation of an enzyme (e.g. Mg2+-ATPase; Schoner et al., 1967; J0rgensen & Skou, 1969) but rather in an alteration of some, e.g. kinetic, properties. The present paper describes some results on the side effects ofEDTA and...