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Lipid Bilayer Composition Affects Transmembrane Protein Orientation and Function
Sperm membranes change in structure and composition upon ejaculation to undergo capacitation, a molecular transformation which enables spermatozoa to undergo the acrosome reaction and be capable of fertilization. Changes to the membrane environment including lipid composition, specifically lipid mic...
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Formato: | Texto |
Lenguaje: | English |
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Hindawi Publishing Corporation
2011
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3068514/ https://www.ncbi.nlm.nih.gov/pubmed/21490797 http://dx.doi.org/10.1155/2011/208457 |
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author | Hickey, Katie D. Buhr, Mary M. |
author_facet | Hickey, Katie D. Buhr, Mary M. |
author_sort | Hickey, Katie D. |
collection | PubMed |
description | Sperm membranes change in structure and composition upon ejaculation to undergo capacitation, a molecular transformation which enables spermatozoa to undergo the acrosome reaction and be capable of fertilization. Changes to the membrane environment including lipid composition, specifically lipid microdomains, may be responsible for enabling capacitation. To study the effect of lipid environment on proteins, liposomes were created using lipids extracted from bull sperm membranes, with or without a protein (Na(+) K(+)-ATPase or α-amylase). Protein incorporation, function, and orientation were determined. Fluorescence resonance energy transfer (FRET) confirmed protein inclusion in the lipid bilayer, and protein function was confirmed using a colourometric assay of phosphate production from ATP cleavage. In the native lipid liposomes, ATPase was oriented with the β subunit facing the outer leaflet, while changing the lipid composition to 50% native lipids and 50% exogenous lipids significantly altered this orientation of Na(+) K(+)-ATPase within the membranes. |
format | Text |
id | pubmed-3068514 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2011 |
publisher | Hindawi Publishing Corporation |
record_format | MEDLINE/PubMed |
spelling | pubmed-30685142011-04-13 Lipid Bilayer Composition Affects Transmembrane Protein Orientation and Function Hickey, Katie D. Buhr, Mary M. J Lipids Research Article Sperm membranes change in structure and composition upon ejaculation to undergo capacitation, a molecular transformation which enables spermatozoa to undergo the acrosome reaction and be capable of fertilization. Changes to the membrane environment including lipid composition, specifically lipid microdomains, may be responsible for enabling capacitation. To study the effect of lipid environment on proteins, liposomes were created using lipids extracted from bull sperm membranes, with or without a protein (Na(+) K(+)-ATPase or α-amylase). Protein incorporation, function, and orientation were determined. Fluorescence resonance energy transfer (FRET) confirmed protein inclusion in the lipid bilayer, and protein function was confirmed using a colourometric assay of phosphate production from ATP cleavage. In the native lipid liposomes, ATPase was oriented with the β subunit facing the outer leaflet, while changing the lipid composition to 50% native lipids and 50% exogenous lipids significantly altered this orientation of Na(+) K(+)-ATPase within the membranes. Hindawi Publishing Corporation 2011 2011-01-26 /pmc/articles/PMC3068514/ /pubmed/21490797 http://dx.doi.org/10.1155/2011/208457 Text en Copyright © 2011 K. D. Hickey and M. M. Buhr. https://creativecommons.org/licenses/by/3.0/ This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. |
spellingShingle | Research Article Hickey, Katie D. Buhr, Mary M. Lipid Bilayer Composition Affects Transmembrane Protein Orientation and Function |
title | Lipid Bilayer Composition Affects Transmembrane Protein Orientation and Function |
title_full | Lipid Bilayer Composition Affects Transmembrane Protein Orientation and Function |
title_fullStr | Lipid Bilayer Composition Affects Transmembrane Protein Orientation and Function |
title_full_unstemmed | Lipid Bilayer Composition Affects Transmembrane Protein Orientation and Function |
title_short | Lipid Bilayer Composition Affects Transmembrane Protein Orientation and Function |
title_sort | lipid bilayer composition affects transmembrane protein orientation and function |
topic | Research Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3068514/ https://www.ncbi.nlm.nih.gov/pubmed/21490797 http://dx.doi.org/10.1155/2011/208457 |
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