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Preparation of plant cells for transmission electron microscopy to optimize immunogold labeling of carbohydrate and protein epitopes
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Preparation of plant cells for transmission electron microscopy to optimize immunogold labeling of carbohydrate and protein epitopes
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Preparation of plant cells for transmission electron microscopy to optimize immunogold labeling of carbohydrate and protein epitopes
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Journal Article
Preparation of plant cells for transmission electron microscopy to optimize immunogold labeling of carbohydrate and protein epitopes
2012
Overview
Despite the remarkable advances in electron microscopy, the difficulty in preserving the ultrastructural details of many plant cells is the major limitation to exploiting the full potential of this technology. The very nature of plant cells, including their hydrophobic surfaces, rigid cell walls and large vacuoles, make them recalcitrant to the efficient exchange of reagents that are crucial to preserving their fine structure. Achieving ultrastructural preservation while protecting the antigenicity of molecular epitopes has proven difficult. Here we describe two methods that provide good ultrastructural detail in plant cells while preserving the binding capacity of carbohydrate and protein epitopes. The first is a traditional, chemical-based protocol used to prepare developing grass (cereal) grain for electron microscopy and to locate carbohydrates as they are deposited using immunogold labeling. The second uses cryofixation techniques, including high-pressure freezing and freeze substitution, to prepare delicate, tip-growing pollen tubes and to locate the intracellular site of a polysaccharide synthase. Both procedures can take as long as 2 weeks to achieve results, but there is scope to fast-track some steps depending on the physical characteristics of the material being processed.
Publisher
Nature Publishing Group UK,Nature Publishing Group
Subject
/ Analytic Sample Preparation Methods - methods
/ Computational Biology/Bioinformatics
/ Epitopes
/ Freezing
/ Grasses
/ Immunohistochemistry - methods
/ Labeling
/ Microscopy, Electron, Transmission - methods
/ Plant Cells - ultrastructure
/ Pollen
/ Proteins
/ Protocol
/ Reagents
/ Transmission electron microscopy
/ Vacuoles
