Isolation and Characterization of Vacuoles from the Ergot Fungus Claviceps purpurea.

Abstract:

:Protoplasts of Claviceps purpurea were prepared by treatment of mycelium with a lytic mixture of snail gut enzyme and cellulase from Trichoderma viride. Such protoplasts could be efficiently lysed by Triton X-100 treatment at high osmotic pressure without Ca or Mg, allowing the release of intact vacuoles in high yields. Vacuoles obtained from cells grown in modified Vogel medium (vegetative-type cells not producing alkaloids) were isolated and purified by centrifugation from a 5% Ficoll 400 (wt/vol) phase into the interphase between two layers, one containing 0.25 M each of mannitol and sucrose, and one containing 0.5 M mannitol. Vacuoles derived from cells grown in a medium favoring ergot alkaloid synthesis (sclerotia-like cells) were isolated by gentle centrifugation of filtered protoplast lysates without addition of Ficoll 400. Biochemical analyses of the vacuole fraction isolated from either kind of cell revealed their function as compartments harboring several hydrolytic enzymes. However, the enrichment of free amino acids in vacuoles of sclerotia-like cells was less pronounced than that in vacuoles of vegetative-type cells, indicating a difference in metabolic compartmentation in the two types of cells.

journal_name

Appl Environ Microbiol

authors

Keller U,Madry N,Kleinkauf H,Glund K

doi

10.1128/AEM.47.4.710-714.1984

keywords:

subject

Has Abstract

pub_date

1984-04-01 00:00:00

pages

710-4

issue

4

eissn

0099-2240

issn

1098-5336

journal_volume

47

pub_type

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