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. 1987 Aug;84(4):1197–1203. doi: 10.1104/pp.84.4.1197

Intracellular Localization of Heat Shock Proteins in Maize 1

Pam Cooper 1,2,2, Tuan-Hua David Ho 1,2
PMCID: PMC1056751  PMID: 16665584

Abstract

The intracellular distribution of the maize root heat shock proteins (hsp) was studied as a step toward understanding their physiological function. Linear sucrose density centrifugation was employed to separate organelles so the relative quantities of hsp in different subcellular compartments could be analyzed in a single preparation. Gradient fractions were assayed for the presence of hsp by sodium dodecyl sulfate-polyacrylamide gel electrophoresis and for marker enzyme activities. Analyses of 15 to 60% gradients showed five hsp to be organelle associated. Hsp 25 and 72 were in fractions containing closely equilibrating Golgi and endoplasmic reticulum marker activities, while hsp 18, 29, and 72 were in fractions containing overlapping plasma membrane, mitochondria, and glyoxysomal marker activities. Hsp larger than 72 kilodaltons were not present in gradient fractions. A second fractionation scheme achieved better separation of the two sets of closely equilibrating organelles. When a 13,000g centrifugation step to remove mitochondria was employed prior to gradient centrifugation, hsp 29 was absent from the gradient fractions. If the buoyant density of the endoplasmic reticulum was shifted by either maintaining the ribosomes on the membrane or removing them, a corresponding shift in the equilibrium positions of hsp 25 and 72 occurred. Hsp 18 and 70 remained in plasma membrane-containing fractions irrespective of these treatments.

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Selected References

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