Journal article 709 views
Microsomal glutathione transferase 1 exhibits one-third-of-the-sites-reactivity towards glutathione
Archives of Biochemistry and Biophysics, Volume: 487, Issue: 1, Pages: 42 - 48
Swansea University Author: William Griffiths
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DOI (Published version): 10.1016/j.abb.2009.04.009
Abstract
The trimeric membrane protein microsomal glutathione transferase 1 (MGST1) possesses glutathione transferase and peroxidase activity. Previous data indicated one active site/trimer whereas structural data suggests three GSH-binding sites. Here we have determined ligand interactions of MGST1 by sever...
Published in: | Archives of Biochemistry and Biophysics |
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ISSN: | 0003-9861 |
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2009
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URI: | https://cronfa.swan.ac.uk/Record/cronfa10949 |
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2011-10-01T00:00:00.0000000 v2 10949 2012-06-05 Microsomal glutathione transferase 1 exhibits one-third-of-the-sites-reactivity towards glutathione 3316b1d1b524be1831790933eed1c26e 0000-0002-4129-6616 William Griffiths William Griffiths true false 2012-06-05 BMS The trimeric membrane protein microsomal glutathione transferase 1 (MGST1) possesses glutathione transferase and peroxidase activity. Previous data indicated one active site/trimer whereas structural data suggests three GSH-binding sites. Here we have determined ligand interactions of MGST1 by several techniques. Nanoelectrospray mass spectrometry of native MGST1 revealed binding of three GSH molecules/trimer and equilibrium dialysis showed three product molecules/trimer (Kd = 320 ± 50 μM). All three product molecules could be competed out with GSH. Reinvestigation of GSH-binding showed one high affinity site per trimer, consistent with earlier data. Using single turnover stopped flow kinetic measurements, Kd could be determined for a low affinity GSH-binding site (2.5 ± 0.5 mM). Thus we can reconcile previous observations and show here that MGST1 contains three active sites with different affinities for GSH and that only the high affinity site is catalytically competent. Journal Article Archives of Biochemistry and Biophysics 487 1 42 48 0003-9861 31 12 2009 2009-12-31 10.1016/j.abb.2009.04.009 COLLEGE NANME Biomedical Sciences COLLEGE CODE BMS Swansea University 2011-10-01T00:00:00.0000000 2012-06-05T16:39:57.4585246 Faculty of Medicine, Health and Life Sciences Swansea University Medical School - Medicine Johan Ålander 1 Johan Lengqvist 2 Peter J Holm 3 Richard Svensson 4 Pascal Gerbaux 5 Robert H.H. van den Heuvel 6 Hans Hebert 7 William Griffiths 0000-0002-4129-6616 8 Richard N Armstrong 9 Ralf Morgenstern 10 |
title |
Microsomal glutathione transferase 1 exhibits one-third-of-the-sites-reactivity towards glutathione |
spellingShingle |
Microsomal glutathione transferase 1 exhibits one-third-of-the-sites-reactivity towards glutathione William Griffiths |
title_short |
Microsomal glutathione transferase 1 exhibits one-third-of-the-sites-reactivity towards glutathione |
title_full |
Microsomal glutathione transferase 1 exhibits one-third-of-the-sites-reactivity towards glutathione |
title_fullStr |
Microsomal glutathione transferase 1 exhibits one-third-of-the-sites-reactivity towards glutathione |
title_full_unstemmed |
Microsomal glutathione transferase 1 exhibits one-third-of-the-sites-reactivity towards glutathione |
title_sort |
Microsomal glutathione transferase 1 exhibits one-third-of-the-sites-reactivity towards glutathione |
author_id_str_mv |
3316b1d1b524be1831790933eed1c26e |
author_id_fullname_str_mv |
3316b1d1b524be1831790933eed1c26e_***_William Griffiths |
author |
William Griffiths |
author2 |
Johan Ålander Johan Lengqvist Peter J Holm Richard Svensson Pascal Gerbaux Robert H.H. van den Heuvel Hans Hebert William Griffiths Richard N Armstrong Ralf Morgenstern |
format |
Journal article |
container_title |
Archives of Biochemistry and Biophysics |
container_volume |
487 |
container_issue |
1 |
container_start_page |
42 |
publishDate |
2009 |
institution |
Swansea University |
issn |
0003-9861 |
doi_str_mv |
10.1016/j.abb.2009.04.009 |
college_str |
Faculty of Medicine, Health and Life Sciences |
hierarchytype |
|
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facultyofmedicinehealthandlifesciences |
hierarchy_top_title |
Faculty of Medicine, Health and Life Sciences |
hierarchy_parent_id |
facultyofmedicinehealthandlifesciences |
hierarchy_parent_title |
Faculty of Medicine, Health and Life Sciences |
department_str |
Swansea University Medical School - Medicine{{{_:::_}}}Faculty of Medicine, Health and Life Sciences{{{_:::_}}}Swansea University Medical School - Medicine |
document_store_str |
0 |
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description |
The trimeric membrane protein microsomal glutathione transferase 1 (MGST1) possesses glutathione transferase and peroxidase activity. Previous data indicated one active site/trimer whereas structural data suggests three GSH-binding sites. Here we have determined ligand interactions of MGST1 by several techniques. Nanoelectrospray mass spectrometry of native MGST1 revealed binding of three GSH molecules/trimer and equilibrium dialysis showed three product molecules/trimer (Kd = 320 ± 50 μM). All three product molecules could be competed out with GSH. Reinvestigation of GSH-binding showed one high affinity site per trimer, consistent with earlier data. Using single turnover stopped flow kinetic measurements, Kd could be determined for a low affinity GSH-binding site (2.5 ± 0.5 mM). Thus we can reconcile previous observations and show here that MGST1 contains three active sites with different affinities for GSH and that only the high affinity site is catalytically competent. |
published_date |
2009-12-31T03:12:30Z |
_version_ |
1763750078808326144 |
score |
11.016235 |