PMID: 6945586Jul 1, 1981Paper

Stabilization and the cytoplasmic ground substance in detergent-opened cells and a structural and biochemical analysis of its composition

Proceedings of the National Academy of Sciences of the United States of America
M SchliwaK R Porter


Treatment of epithelial BSC-1 cells with low concentrations of the detergent Brij 58 results in partial or complete removal of the plasmalemma and partial extraction of internal membrane-bound organelles without causing massive release of "cytosolic" proteins from the cytoplasmic ground substance. Stereoscopic high-voltage electron microscopy of such extracted and fixed cells demonstrates a system of slender (4-20 nm) strands in a three-dimensional "microtrabecular" arrangement similar to that observed in unextracted whole-mount preparations. Extraction of Brij-extracted cells with Triton X-100 dissolves many of the microtrabecular strands, leaving, as a more stable structure, a characteristic cytoskeletal network composed of various filaments and microtubules. Two-dimensional polyacrylamide gel electrophoresis of 35S-labeled polypeptides performed concurrently with the morphological studies demonstrates that Triton extraction of Brij-extracted cells releases a large number of polypeptides. This release parallels the loss of structural components observed by electron microscopy. Labeling of Brij-extracted cells with heavy meromyosin subfragment 1 decorates actin filaments with characteristic arrowhead complexes which are readil...Continue Reading


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