Electron microscopy and image analysis of the multicatalytic proteinase

Baumeister, W.; Dahlmann, B.; Hegerl, R.; Kopp, F.; Kühn, L.; Pfeifer, G.

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Electron microscopy and image analysis of the multicatalytic proteinase

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Baumeister, W., Dahlmann, B., Hegerl, R., Kopp, F., Kühn, L., & Pfeifer, G. (1988). Electron microscopy and image analysis of the multicatalytic proteinase. FEBS Letters., 241(1-2), 239-245.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0010-74AA-E

Abstract

One electron micrographs, negatively stained multicatalytic proteinase molecules are viewed end-on (ring shaped) or side-on (rectangular shaped). For aurothioglucose, ammonium molybdate- and phosphotungstate-stained molecules, the dimensions measured are consistent. In contrast, uranyl acetate-staining reveals ring-shaped particles which vary in diameter between 12 and 16 nm. This is due to a partial collapse and substantial flattening of the structure. Digital image analysis of side-on views of the particles reveals a tripartite, reel-shaped structure. Within the ring-like, end-on projections of ammonium molybdate-stained molecules six local centres of mass can be discerned; their position appears to depart, however, from a true six-fold symmetry.