The Experts below are selected from a list of 375663 Experts worldwide ranked by ideXlab platform
Takashi Murayama - One of the best experts on this subject based on the ideXlab platform.
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Engineering a Novel Multifunctional Green Fluorescent Protein Tag for a Wide Variety of Protein Research
PLOS ONE, 2008Co-Authors: Takuya Kobayashi, Hideto Oyamada, Nagomi Kurebayashi, Taku Kashiyama, Nobuhiro Morone, Takashi MurayamaAbstract:Background: Genetically encoded tag is a powerful tool for protein research. Various kinds of tags have been developed: fluorescent proteins for live-cell imaging, affinity tags for protein isolation, and epitope tags for immunological detections. One of the major problems concerning the protein tagging is that many constructs with different tags have to be made for different applications, which is time- and resource-consuming. Methodology/Principal Findings: Here we report a novel multifunctional green fluorescent protein (mfGFP) tag which was engineered by inserting multiple peptide tags, i.e., octa-histidine (86His), streptavidin-binding peptide (SBP), and c-Myc tag, in tandem into a loop of GFP. When fused to various proteins, mfGFP monitored their localization in living cells. Streptavidin agarose column chromatography with the SBP tag successfully isolated the protein complexes in a native form with a high purity. Tandem affinity purification (TAP) with 86His and SBP tags in mfGFP further purified the protein complexes. mfGFP was clearly detected by c-Myc-specific antibody both in immunofluorescence and immuno-electron microscopy (EM). These findings indicate that mfGFP works well as a multifunctional tag in mammalian cells. The tag insertion was also successful in other fluorescent protein, mCherry. Conclusions and Significance: The multifunctional fluorescent protein tag is a useful tool for a wide variety of protein research, and may have the advantage over other multiple tag systems in its higher expandability and compatibility with existing and future tag technologies.
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Engineering a Novel Multifunctional Green Fluorescent Protein Tag for a Wide Variety of Protein Research
PLOS ONE, 2008Co-Authors: Takuya Kobayashi, Hideto Oyamada, Nagomi Kurebayashi, Taku Kashiyama, Nobuhiro Morone, Takashi MurayamaAbstract:Background: Genetically encoded tag is a powerful tool for protein research. Various kinds of tags have been developed: fluorescent proteins for live-cell imaging, affinity tags for protein isolation, and epitope tags for immunological detections. One of the major problems concerning the protein tagging is that many constructs with different tags have to be made for different applications, which is time- and resource-consuming. Methodology/Principal Findings: Here we report a novel multifunctional green fluorescent protein (mfGFP) tag which was engineered by inserting multiple peptide tags, i.e., octa-histidine (86His), streptavidin-binding peptide (SBP), and c-Myc tag, in tandem into a loop of GFP. When fused to various proteins, mfGFP monitored their localization in living cells. Streptavidin agarose column chromatography with the SBP tag successfully isolated the protein complexes in a native form with a high purity. Tandem affinity purification (TAP) with 86His and SBP tags in mfGFP further purified the protein complexes. mfGFP was clearly detected by c-Myc-specific antibody both in immunofluorescence and immuno-electron microscopy (EM). These findings indicate that mfGFP works well as a multifunctional tag in mammalian cells. The tag insertion was also successful in other fluorescent protein, mCherry. Conclusions and Significance: The multifunctional fluorescent protein tag is a useful tool for a wide variety of protein research, and may have the advantage over other multiple tag systems in its higher expandability and compatibility with existing and future tag technologies.
Jean-yves Lapointe - One of the best experts on this subject based on the ideXlab platform.
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Functional expression of tagged human Na+-glucose cotransporter in Xenopus laevis oocytes.
The Journal of physiology, 1999Co-Authors: Pierre Bissonnette, Josette Noël, Michael J. Coady, Jean-yves LapointeAbstract:1. High-affinity, secondary active transport of glucose in the intestine and kidney is mediated by an integral membrane protein named SGLT1 (sodium glucose cotransporter). Though basic properties of the transporter are now defined, many questions regarding the structure- function relationship of the protein, its biosynthesis and targeting remain unanswered. In order to better address these questions, we produced a functional hSGLT1 protein (from human) containing a reporter tag. 2. Six constructs, made from three tags (myc, haemaglutinin and poly-His) inserted at both the C- and N-terminal positions, were thus tested using the Xenopus oocyte expression system via electrophysiology and immunohistochemistry. Of these, only the hSGLT1 construct with the myc tag inserted at the N-terminal position proved to be of interest, all other constructs showing no or little transport activity. A systematic comparison of transport properties was therefore performed between the Myc-Tagged and the untagged hSGLT1 proteins. 3. On the basis of both steady-state (affinities for substrate (glucose) and inhibitor (phlorizin) as well as expression levels) and presteady-state parameters (transient currents) we conclude that the two proteins are functionally indistinguishable, at least under these criteria. Immunological detection confirmed the appropriate targeting of the tagged protein to the plasma membrane of the oocyte with the epitope located at the extracellular side. 4. The Myc-Tagged hSGLT1 was also successfully expressed in polarized MDCK cells. alpha-Methylglucose uptake studies on transfected cells showed an exclusively apical uptake pathway, thus indicating that the expressed protein was correctly targeted to the apical domain of the cell. 5. These comparative studies demonstrate that the myc epitope inserted at the N-terminus of hSGLT1 produces a fully functional protein while other epitopes of similar size inserted at either end of the protein inactivated the final protein.
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Functional expression of tagged human Na+—glucose cotransporter in Xenopus laevis oocytes
The Journal of Physiology, 1999Co-Authors: Pierre Bissonnette, Josette Noël, Michael J. Coady, Jean-yves LapointeAbstract:1. High-affinity, secondary active transport of glucose in the intestine and kidney is mediated by an integral membrane protein named SGLT1 (sodium glucose cotransporter). Though basic properties of the transporter are now defined, many questions regarding the structure- function relationship of the protein, its biosynthesis and targeting remain unanswered. In order to better address these questions, we produced a functional hSGLT1 protein (from human) containing a reporter tag. 2. Six constructs, made from three tags (myc, haemaglutinin and poly-His) inserted at both the C- and N-terminal positions, were thus tested using the Xenopus oocyte expression system via electrophysiology and immunohistochemistry. Of these, only the hSGLT1 construct with the myc tag inserted at the N-terminal position proved to be of interest, all other constructs showing no or little transport activity. A systematic comparison of transport properties was therefore performed between the Myc-Tagged and the untagged hSGLT1 proteins. 3. On the basis of both steady-state (affinities for substrate (glucose) and inhibitor (phlorizin) as well as expression levels) and presteady-state parameters (transient currents) we conclude that the two proteins are functionally indistinguishable, at least under these criteria. Immunological detection confirmed the appropriate targeting of the tagged protein to the plasma membrane of the oocyte with the epitope located at the extracellular side. 4. The Myc-Tagged hSGLT1 was also successfully expressed in polarized MDCK cells. alpha-Methylglucose uptake studies on transfected cells showed an exclusively apical uptake pathway, thus indicating that the expressed protein was correctly targeted to the apical domain of the cell. 5. These comparative studies demonstrate that the myc epitope inserted at the N-terminus of hSGLT1 produces a fully functional protein while other epitopes of similar size inserted at either end of the protein inactivated the final protein.
Takuya Kobayashi - One of the best experts on this subject based on the ideXlab platform.
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Engineering a Novel Multifunctional Green Fluorescent Protein Tag for a Wide Variety of Protein Research
PLOS ONE, 2008Co-Authors: Takuya Kobayashi, Hideto Oyamada, Nagomi Kurebayashi, Taku Kashiyama, Nobuhiro Morone, Takashi MurayamaAbstract:Background: Genetically encoded tag is a powerful tool for protein research. Various kinds of tags have been developed: fluorescent proteins for live-cell imaging, affinity tags for protein isolation, and epitope tags for immunological detections. One of the major problems concerning the protein tagging is that many constructs with different tags have to be made for different applications, which is time- and resource-consuming. Methodology/Principal Findings: Here we report a novel multifunctional green fluorescent protein (mfGFP) tag which was engineered by inserting multiple peptide tags, i.e., octa-histidine (86His), streptavidin-binding peptide (SBP), and c-Myc tag, in tandem into a loop of GFP. When fused to various proteins, mfGFP monitored their localization in living cells. Streptavidin agarose column chromatography with the SBP tag successfully isolated the protein complexes in a native form with a high purity. Tandem affinity purification (TAP) with 86His and SBP tags in mfGFP further purified the protein complexes. mfGFP was clearly detected by c-Myc-specific antibody both in immunofluorescence and immuno-electron microscopy (EM). These findings indicate that mfGFP works well as a multifunctional tag in mammalian cells. The tag insertion was also successful in other fluorescent protein, mCherry. Conclusions and Significance: The multifunctional fluorescent protein tag is a useful tool for a wide variety of protein research, and may have the advantage over other multiple tag systems in its higher expandability and compatibility with existing and future tag technologies.
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Engineering a Novel Multifunctional Green Fluorescent Protein Tag for a Wide Variety of Protein Research
PLOS ONE, 2008Co-Authors: Takuya Kobayashi, Hideto Oyamada, Nagomi Kurebayashi, Taku Kashiyama, Nobuhiro Morone, Takashi MurayamaAbstract:Background: Genetically encoded tag is a powerful tool for protein research. Various kinds of tags have been developed: fluorescent proteins for live-cell imaging, affinity tags for protein isolation, and epitope tags for immunological detections. One of the major problems concerning the protein tagging is that many constructs with different tags have to be made for different applications, which is time- and resource-consuming. Methodology/Principal Findings: Here we report a novel multifunctional green fluorescent protein (mfGFP) tag which was engineered by inserting multiple peptide tags, i.e., octa-histidine (86His), streptavidin-binding peptide (SBP), and c-Myc tag, in tandem into a loop of GFP. When fused to various proteins, mfGFP monitored their localization in living cells. Streptavidin agarose column chromatography with the SBP tag successfully isolated the protein complexes in a native form with a high purity. Tandem affinity purification (TAP) with 86His and SBP tags in mfGFP further purified the protein complexes. mfGFP was clearly detected by c-Myc-specific antibody both in immunofluorescence and immuno-electron microscopy (EM). These findings indicate that mfGFP works well as a multifunctional tag in mammalian cells. The tag insertion was also successful in other fluorescent protein, mCherry. Conclusions and Significance: The multifunctional fluorescent protein tag is a useful tool for a wide variety of protein research, and may have the advantage over other multiple tag systems in its higher expandability and compatibility with existing and future tag technologies.
Pierre Bissonnette - One of the best experts on this subject based on the ideXlab platform.
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Functional expression of tagged human Na+-glucose cotransporter in Xenopus laevis oocytes.
The Journal of physiology, 1999Co-Authors: Pierre Bissonnette, Josette Noël, Michael J. Coady, Jean-yves LapointeAbstract:1. High-affinity, secondary active transport of glucose in the intestine and kidney is mediated by an integral membrane protein named SGLT1 (sodium glucose cotransporter). Though basic properties of the transporter are now defined, many questions regarding the structure- function relationship of the protein, its biosynthesis and targeting remain unanswered. In order to better address these questions, we produced a functional hSGLT1 protein (from human) containing a reporter tag. 2. Six constructs, made from three tags (myc, haemaglutinin and poly-His) inserted at both the C- and N-terminal positions, were thus tested using the Xenopus oocyte expression system via electrophysiology and immunohistochemistry. Of these, only the hSGLT1 construct with the myc tag inserted at the N-terminal position proved to be of interest, all other constructs showing no or little transport activity. A systematic comparison of transport properties was therefore performed between the Myc-Tagged and the untagged hSGLT1 proteins. 3. On the basis of both steady-state (affinities for substrate (glucose) and inhibitor (phlorizin) as well as expression levels) and presteady-state parameters (transient currents) we conclude that the two proteins are functionally indistinguishable, at least under these criteria. Immunological detection confirmed the appropriate targeting of the tagged protein to the plasma membrane of the oocyte with the epitope located at the extracellular side. 4. The Myc-Tagged hSGLT1 was also successfully expressed in polarized MDCK cells. alpha-Methylglucose uptake studies on transfected cells showed an exclusively apical uptake pathway, thus indicating that the expressed protein was correctly targeted to the apical domain of the cell. 5. These comparative studies demonstrate that the myc epitope inserted at the N-terminus of hSGLT1 produces a fully functional protein while other epitopes of similar size inserted at either end of the protein inactivated the final protein.
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Functional expression of tagged human Na+—glucose cotransporter in Xenopus laevis oocytes
The Journal of Physiology, 1999Co-Authors: Pierre Bissonnette, Josette Noël, Michael J. Coady, Jean-yves LapointeAbstract:1. High-affinity, secondary active transport of glucose in the intestine and kidney is mediated by an integral membrane protein named SGLT1 (sodium glucose cotransporter). Though basic properties of the transporter are now defined, many questions regarding the structure- function relationship of the protein, its biosynthesis and targeting remain unanswered. In order to better address these questions, we produced a functional hSGLT1 protein (from human) containing a reporter tag. 2. Six constructs, made from three tags (myc, haemaglutinin and poly-His) inserted at both the C- and N-terminal positions, were thus tested using the Xenopus oocyte expression system via electrophysiology and immunohistochemistry. Of these, only the hSGLT1 construct with the myc tag inserted at the N-terminal position proved to be of interest, all other constructs showing no or little transport activity. A systematic comparison of transport properties was therefore performed between the Myc-Tagged and the untagged hSGLT1 proteins. 3. On the basis of both steady-state (affinities for substrate (glucose) and inhibitor (phlorizin) as well as expression levels) and presteady-state parameters (transient currents) we conclude that the two proteins are functionally indistinguishable, at least under these criteria. Immunological detection confirmed the appropriate targeting of the tagged protein to the plasma membrane of the oocyte with the epitope located at the extracellular side. 4. The Myc-Tagged hSGLT1 was also successfully expressed in polarized MDCK cells. alpha-Methylglucose uptake studies on transfected cells showed an exclusively apical uptake pathway, thus indicating that the expressed protein was correctly targeted to the apical domain of the cell. 5. These comparative studies demonstrate that the myc epitope inserted at the N-terminus of hSGLT1 produces a fully functional protein while other epitopes of similar size inserted at either end of the protein inactivated the final protein.
Hideto Oyamada - One of the best experts on this subject based on the ideXlab platform.
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Engineering a Novel Multifunctional Green Fluorescent Protein Tag for a Wide Variety of Protein Research
PLOS ONE, 2008Co-Authors: Takuya Kobayashi, Hideto Oyamada, Nagomi Kurebayashi, Taku Kashiyama, Nobuhiro Morone, Takashi MurayamaAbstract:Background: Genetically encoded tag is a powerful tool for protein research. Various kinds of tags have been developed: fluorescent proteins for live-cell imaging, affinity tags for protein isolation, and epitope tags for immunological detections. One of the major problems concerning the protein tagging is that many constructs with different tags have to be made for different applications, which is time- and resource-consuming. Methodology/Principal Findings: Here we report a novel multifunctional green fluorescent protein (mfGFP) tag which was engineered by inserting multiple peptide tags, i.e., octa-histidine (86His), streptavidin-binding peptide (SBP), and c-Myc tag, in tandem into a loop of GFP. When fused to various proteins, mfGFP monitored their localization in living cells. Streptavidin agarose column chromatography with the SBP tag successfully isolated the protein complexes in a native form with a high purity. Tandem affinity purification (TAP) with 86His and SBP tags in mfGFP further purified the protein complexes. mfGFP was clearly detected by c-Myc-specific antibody both in immunofluorescence and immuno-electron microscopy (EM). These findings indicate that mfGFP works well as a multifunctional tag in mammalian cells. The tag insertion was also successful in other fluorescent protein, mCherry. Conclusions and Significance: The multifunctional fluorescent protein tag is a useful tool for a wide variety of protein research, and may have the advantage over other multiple tag systems in its higher expandability and compatibility with existing and future tag technologies.
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Engineering a Novel Multifunctional Green Fluorescent Protein Tag for a Wide Variety of Protein Research
PLOS ONE, 2008Co-Authors: Takuya Kobayashi, Hideto Oyamada, Nagomi Kurebayashi, Taku Kashiyama, Nobuhiro Morone, Takashi MurayamaAbstract:Background: Genetically encoded tag is a powerful tool for protein research. Various kinds of tags have been developed: fluorescent proteins for live-cell imaging, affinity tags for protein isolation, and epitope tags for immunological detections. One of the major problems concerning the protein tagging is that many constructs with different tags have to be made for different applications, which is time- and resource-consuming. Methodology/Principal Findings: Here we report a novel multifunctional green fluorescent protein (mfGFP) tag which was engineered by inserting multiple peptide tags, i.e., octa-histidine (86His), streptavidin-binding peptide (SBP), and c-Myc tag, in tandem into a loop of GFP. When fused to various proteins, mfGFP monitored their localization in living cells. Streptavidin agarose column chromatography with the SBP tag successfully isolated the protein complexes in a native form with a high purity. Tandem affinity purification (TAP) with 86His and SBP tags in mfGFP further purified the protein complexes. mfGFP was clearly detected by c-Myc-specific antibody both in immunofluorescence and immuno-electron microscopy (EM). These findings indicate that mfGFP works well as a multifunctional tag in mammalian cells. The tag insertion was also successful in other fluorescent protein, mCherry. Conclusions and Significance: The multifunctional fluorescent protein tag is a useful tool for a wide variety of protein research, and may have the advantage over other multiple tag systems in its higher expandability and compatibility with existing and future tag technologies.
