Structure and stability of the spinach aquaporin SoPIP2;1 in detergent micelles and lipid membranes.
BACKGROUND: SoPIP2;1 constitutes one of the major integral proteins in spinach leaf plasma membranes and belongs to the aquaporin family. SoPIP2;1 is a highly permeable and selective water channel that has been successfully overexpressed and purified with high yields. In order to optimize reconstitu...
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| Format: | Article |
| Language: | English |
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Public Library of Science (PLoS)
2011-01-01
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| Series: | PLoS ONE |
| Online Access: | http://europepmc.org/articles/PMC3038850?pdf=render |
| _version_ | 1818536884012318720 |
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| author | Inés Plasencia Sabeen Survery Sania Ibragimova Jesper S Hansen Per Kjellbom Claus Helix-Nielsen Urban Johanson Ole G Mouritsen |
| author_facet | Inés Plasencia Sabeen Survery Sania Ibragimova Jesper S Hansen Per Kjellbom Claus Helix-Nielsen Urban Johanson Ole G Mouritsen |
| author_sort | Inés Plasencia |
| collection | DOAJ |
| description | BACKGROUND: SoPIP2;1 constitutes one of the major integral proteins in spinach leaf plasma membranes and belongs to the aquaporin family. SoPIP2;1 is a highly permeable and selective water channel that has been successfully overexpressed and purified with high yields. In order to optimize reconstitution of the purified protein into biomimetic systems, we have here for the first time characterized the structural stability of SoPIP2;1. METHODOLOGY/PRINCIPAL FINDING: We have characterized the protein structural stability after purification and after reconstitution into detergent micelles and proteoliposomes using circular dichroism and fluorescence spectroscopy techniques. The structure of SoPIP2;1 was analyzed either with the protein solubilized with octyl-β-D-glucopyranoside (OG) or reconstituted into lipid membranes formed by E. coli lipids, diphytanoylphosphatidylcholine (DPhPC), or reconstituted into lipid membranes formed from mixtures of 1-palmitoyl-2-oleoyl-phosphatidylcholine (POPE), 1-palmitoyl-2oleoyl-phosphatidylethanolamine (POPE), 1-palmitoyl-2-oleoyl-phosphatidylserine (POPS), and ergosterol. Generally, SoPIP2;1 secondary structure was found to be predominantly α-helical in accordance with crystallographic data. The protein has a high thermal structural stability in detergent solutions, with an irreversible thermal unfolding occurring at a melting temperature of 58°C. Incorporation of the protein into lipid membranes increases the structural stability as evidenced by an increased melting temperature of up to 70°C. CONCLUSION/SIGNIFICANCE: The results of this study provide insights into SoPIP2;1 stability in various host membranes and suggest suitable choices of detergent and lipid composition for reconstitution of SoPIP2;1 into biomimetic membranes for biotechnological applications. |
| first_indexed | 2024-12-11T18:43:40Z |
| format | Article |
| id | doaj.art-c0c334add6fa486c9579fa41934b2ddf |
| institution | Directory Open Access Journal |
| issn | 1932-6203 |
| language | English |
| last_indexed | 2024-12-11T18:43:40Z |
| publishDate | 2011-01-01 |
| publisher | Public Library of Science (PLoS) |
| record_format | Article |
| series | PLoS ONE |
| spelling | doaj.art-c0c334add6fa486c9579fa41934b2ddf2022-12-22T00:54:32ZengPublic Library of Science (PLoS)PLoS ONE1932-62032011-01-0162e1467410.1371/journal.pone.0014674Structure and stability of the spinach aquaporin SoPIP2;1 in detergent micelles and lipid membranes.Inés PlasenciaSabeen SurverySania IbragimovaJesper S HansenPer KjellbomClaus Helix-NielsenUrban JohansonOle G MouritsenBACKGROUND: SoPIP2;1 constitutes one of the major integral proteins in spinach leaf plasma membranes and belongs to the aquaporin family. SoPIP2;1 is a highly permeable and selective water channel that has been successfully overexpressed and purified with high yields. In order to optimize reconstitution of the purified protein into biomimetic systems, we have here for the first time characterized the structural stability of SoPIP2;1. METHODOLOGY/PRINCIPAL FINDING: We have characterized the protein structural stability after purification and after reconstitution into detergent micelles and proteoliposomes using circular dichroism and fluorescence spectroscopy techniques. The structure of SoPIP2;1 was analyzed either with the protein solubilized with octyl-β-D-glucopyranoside (OG) or reconstituted into lipid membranes formed by E. coli lipids, diphytanoylphosphatidylcholine (DPhPC), or reconstituted into lipid membranes formed from mixtures of 1-palmitoyl-2-oleoyl-phosphatidylcholine (POPE), 1-palmitoyl-2oleoyl-phosphatidylethanolamine (POPE), 1-palmitoyl-2-oleoyl-phosphatidylserine (POPS), and ergosterol. Generally, SoPIP2;1 secondary structure was found to be predominantly α-helical in accordance with crystallographic data. The protein has a high thermal structural stability in detergent solutions, with an irreversible thermal unfolding occurring at a melting temperature of 58°C. Incorporation of the protein into lipid membranes increases the structural stability as evidenced by an increased melting temperature of up to 70°C. CONCLUSION/SIGNIFICANCE: The results of this study provide insights into SoPIP2;1 stability in various host membranes and suggest suitable choices of detergent and lipid composition for reconstitution of SoPIP2;1 into biomimetic membranes for biotechnological applications.http://europepmc.org/articles/PMC3038850?pdf=render |
| spellingShingle | Inés Plasencia Sabeen Survery Sania Ibragimova Jesper S Hansen Per Kjellbom Claus Helix-Nielsen Urban Johanson Ole G Mouritsen Structure and stability of the spinach aquaporin SoPIP2;1 in detergent micelles and lipid membranes. PLoS ONE |
| title | Structure and stability of the spinach aquaporin SoPIP2;1 in detergent micelles and lipid membranes. |
| title_full | Structure and stability of the spinach aquaporin SoPIP2;1 in detergent micelles and lipid membranes. |
| title_fullStr | Structure and stability of the spinach aquaporin SoPIP2;1 in detergent micelles and lipid membranes. |
| title_full_unstemmed | Structure and stability of the spinach aquaporin SoPIP2;1 in detergent micelles and lipid membranes. |
| title_short | Structure and stability of the spinach aquaporin SoPIP2;1 in detergent micelles and lipid membranes. |
| title_sort | structure and stability of the spinach aquaporin sopip2 1 in detergent micelles and lipid membranes |
| url | http://europepmc.org/articles/PMC3038850?pdf=render |
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