Isolation and ultrastructural identification of membranes from the fungus Gilbertella persicaria
Protoplasma, ISSN: 0033-183X, Vol: 111, Issue: 2, Page: 87-106
1982
- 5Citations
- 2Captures
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Article Description
Methods are described for isolating and identifying subcellular membranes from walled hyphae of Gilbertella persicaria. Differences in thickness and symmetry of membranes and in contents of vesicles were used to distinguish different types of membranes. Mitochondria, vacuoles, plasma membrane, and vesicles with attached ribosomes from homogenized germlings equilibrated at the 1.2/1.4 M interface in discontinuous sucrose gradients. Accelerated flotation in centrifuged Ficol-sucrose gradients resulted in the additional separation of the mixed membranes into three fractions: one contained predominantly intact mitochondria, another was composed of vacuoles and vesicles coated with ribosomes, and a third was enriched in plasma membranes. Based upon morphometric analysis, these fractions contained 92% mitochondria, 53% vacuoles, and 89% plasma membranes, respectively. The source of vesicles coated with ribosomes was investigated since rapidly growing hyphae of G. persicaria contained little rough endoplasmic reticulum as compared with other classes of membranes. Reconstruction from electron micrographs of mitochondrial fragmentation and vesiculation suggested that most of the ribosome-coated vesicles originated from disrupted mitochondria rather than from rough endoplasmic reticulum. The study demonstrates the utility of ultrastructural markers to identify membranes in vitro independent of, or as an adjunct to, cytochemical and biochemical markers. © 1982 Springer-Verlag.
Bibliographic Details
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=34250230970&origin=inward; http://dx.doi.org/10.1007/bf01282067; http://link.springer.com/10.1007/BF01282067; http://link.springer.com/content/pdf/10.1007/BF01282067; http://link.springer.com/content/pdf/10.1007/BF01282067.pdf; http://link.springer.com/article/10.1007/BF01282067/fulltext.html; http://www.springerlink.com/index/pdf/10.1007/BF01282067; http://www.springerlink.com/index/10.1007/BF01282067; https://dx.doi.org/10.1007/bf01282067; https://link.springer.com/article/10.1007/BF01282067
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