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Eleven tungsten atom cluster labels: high-resolution, site-specific probes for electron microscopy

JF Hainfeld, CJ Foley, LE Maelia and JJ Lipka

Biology Department, Brookhaven National Laboratory, Upton, New York 11973.

Two derivatives of a tungstate cluster containing 11 tungsten atoms (W11PO39SiR4-) have been synthesized which enable them to be covalently attached to biomolecules at specific sites. The tungstate cluster is 1.0 nm in diameter, electron dense, and visible in the electron microscope. One derivative is a W11-sulfonyl chloride, reactive with amines and sulfhydryls. The second compound is a W11-thiosulfonate which can be used to label sulfhydryl groups. These new labels are beam resistant and provide significantly higher resolution then most other electron microscopy (EM) markers. Labeling of the protein albumin is described as an example.

Volume 38, Issue 12, pp. 1787-1793, 12/01/1990
Copyright © 1990 by The Histochemical Society


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The Journal of Histochemistry & Cytochemistry is owned, published, and licensed by The Histochemical Society © 1990