| Maximum yields of microsomal-type membranes from small amounts of plant material without requiring ultracentrifugation. | |
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MedLine Citation:
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PMID: 20193653 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Isolation of a microsomal membrane fraction is a common procedure in studies involving membrane proteins. By conventional definition, microsomal membranes are collected by centrifugation of a postmitochondrial fraction at 100,000g in an ultracentrifuge, a method originally developed for large amounts of mammalian tissue. We present a method for isolating microsomal-type membranes from small amounts of Arabidopsis thaliana plant material that does not rely on ultracentrifugation but instead uses the lower relative centrifugal force (21,000g) of a microcentrifuge. We show that the 21,000g pellet is equivalent to that obtained at 100,000g and that it contains all of the membrane fractions expected in a conventional microsomal fraction. Our method incorporates specific manipulation of sample density throughout the procedure, with minimal preclearance, minimal volumes of extraction buffer, and minimal sedimentation pathlength. These features allow maximal membrane yields, enabling membrane isolation from limited amounts of material. We further demonstrate that conventional ultracentrifuge-based protocols give submaximal yields due to losses during early stages of the procedure; that is, extensive amounts of microsomal-type membranes can sediment prematurely during the typical preclearance steps. Our protocol avoids such losses, thereby ensuring maximal yield and a representative total membrane fraction. The principles of our method can be adapted for nonplant material. |
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Authors:
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Lindy Abas; Christian Luschnig |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2010-03-01 |
Journal Detail:
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Title: Analytical biochemistry Volume: 401 ISSN: 1096-0309 ISO Abbreviation: Anal. Biochem. Publication Date: 2010 Jun |
Date Detail:
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Created Date: 2010-04-26 Completed Date: 2010-07-13 Revised Date: 2011-04-06 |
Medline Journal Info:
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Nlm Unique ID: 0370535 Medline TA: Anal Biochem Country: United States |
Other Details:
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Languages: eng Pagination: 217-27 Citation Subset: IM |
Copyright Information:
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Copyright (c) 2010 Elsevier Inc. All rights reserved. |
Affiliation:
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Department of Applied Genetics and Cell Biology, University of Natural Resources and Applied Life Sciences Vienna (Universität für Bodenkultur Wien), A-1190 Vienna, Austria. melinda.abas@boku.ac.at |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Arabidopsis
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chemistry* Cell Fractionation / methods* Centrifugation / methods Endoplasmic Reticulum / chemistry Membrane Proteins / isolation & purification* Microsomes / chemistry* Plant Proteins / isolation & purification* Ultracentrifugation / methods |
| Grant Support | |
ID/Acronym/Agency:
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P 18840-B16//Austrian Science Fund FWF; P 19585-B16//Austrian Science Fund FWF |
| Chemical | |
Reg. No./Substance:
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0/Membrane Proteins; 0/Plant Proteins |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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