Solution structure of subunit a, a 104-363, of the Saccharomyces cerevisiae V-ATPase and the importance of its C-terminus in structure formation

The 95 kDa subunit a of eukaryotic V-ATPases consists of a C-terminal, ion-translocating part and an N-terminal cytosolic domain. The latter’s N-terminal domain (~40 kDa) is described to bind in an acidification-dependent manner with cytohesin-2 (ARNO), giving the V-ATPase the putative function as p...

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Main Authors: Dip, Phat Vinh, Saw, Wuan Geok, Roessle, Manfred, Marshansky, Vladimir, Grüber, Gerhard
Other Authors: School of Biological Sciences
Format: Article
Language:English
Published: 2013
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Online Access:https://hdl.handle.net/10356/104131
http://hdl.handle.net/10220/17044
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spelling sg-ntu-dr.10356-1041312020-03-07T12:24:55Z Solution structure of subunit a, a 104-363, of the Saccharomyces cerevisiae V-ATPase and the importance of its C-terminus in structure formation Dip, Phat Vinh Saw, Wuan Geok Roessle, Manfred Marshansky, Vladimir Grüber, Gerhard School of Biological Sciences DRNTU::Science::Biological sciences The 95 kDa subunit a of eukaryotic V-ATPases consists of a C-terminal, ion-translocating part and an N-terminal cytosolic domain. The latter’s N-terminal domain (~40 kDa) is described to bind in an acidification-dependent manner with cytohesin-2 (ARNO), giving the V-ATPase the putative function as pH-sensing receptor. Recently, the solution structure of the very N-terminal segment of the cytosolic N-terminal domain has been solved. Here we produced the N-terminal truncated form SCa104-363 of the N-terminal domain (SCa1-363) of the Saccharomyces cerevisiae V-ATPase and determined its low resolution solution structure, derived from SAXS data. SCa104-363 shows an extended S-like conformation with a width of about 3.88 nm and a length of 11.4 nm. The structure has been superimposed into the 3D reconstruction of the related A1AO ATP synthase from Pyrococcus furiosus, revealing that the SCa104-363 fits well into the density of the collar structure of the enzyme complex. To understand the importance of the C-terminus of the protein SCa1-363, and to determine the localization of the N- and C-termini in SCa104-363, the C-terminal truncated form SCa106-324 was produced and analyzed by SAXS. Comparison of the SCa104-363 and SCa106-324 shapes showed that the additional loop region in SCa104-363 consists of the C-terminal residues. Whereas SCa104-363 is monomeric in solution, SCa106-324 forms a dimer, indicating the importance of the very C-terminus in structure formation. Finally, the solution structure of SCa104-363 and SCa106-324 will be discussed in terms of the topological arrangement of subunit a and cytoheisn-2 in V-ATPases. 2013-10-30T04:22:02Z 2019-12-06T21:27:08Z 2013-10-30T04:22:02Z 2019-12-06T21:27:08Z 2012 2012 Journal Article Dip, P. V., Saw, W. G., Roessle, M., Marshansky, V.,& Grüber, G. (2012). Solution structure of subunit a, a 104-363, of the Saccharomyces cerevisiae V-ATPase and the importance of its C-terminus in structure formation. Journal of Bioenergetics and Biomembranes, 44(3), 341-350. 0145-479X https://hdl.handle.net/10356/104131 http://hdl.handle.net/10220/17044 10.1007/s10863-012-9442-3 en Journal of bioenergetics and biomembranes
institution Nanyang Technological University
building NTU Library
country Singapore
collection DR-NTU
language English
topic DRNTU::Science::Biological sciences
spellingShingle DRNTU::Science::Biological sciences
Dip, Phat Vinh
Saw, Wuan Geok
Roessle, Manfred
Marshansky, Vladimir
Grüber, Gerhard
Solution structure of subunit a, a 104-363, of the Saccharomyces cerevisiae V-ATPase and the importance of its C-terminus in structure formation
description The 95 kDa subunit a of eukaryotic V-ATPases consists of a C-terminal, ion-translocating part and an N-terminal cytosolic domain. The latter’s N-terminal domain (~40 kDa) is described to bind in an acidification-dependent manner with cytohesin-2 (ARNO), giving the V-ATPase the putative function as pH-sensing receptor. Recently, the solution structure of the very N-terminal segment of the cytosolic N-terminal domain has been solved. Here we produced the N-terminal truncated form SCa104-363 of the N-terminal domain (SCa1-363) of the Saccharomyces cerevisiae V-ATPase and determined its low resolution solution structure, derived from SAXS data. SCa104-363 shows an extended S-like conformation with a width of about 3.88 nm and a length of 11.4 nm. The structure has been superimposed into the 3D reconstruction of the related A1AO ATP synthase from Pyrococcus furiosus, revealing that the SCa104-363 fits well into the density of the collar structure of the enzyme complex. To understand the importance of the C-terminus of the protein SCa1-363, and to determine the localization of the N- and C-termini in SCa104-363, the C-terminal truncated form SCa106-324 was produced and analyzed by SAXS. Comparison of the SCa104-363 and SCa106-324 shapes showed that the additional loop region in SCa104-363 consists of the C-terminal residues. Whereas SCa104-363 is monomeric in solution, SCa106-324 forms a dimer, indicating the importance of the very C-terminus in structure formation. Finally, the solution structure of SCa104-363 and SCa106-324 will be discussed in terms of the topological arrangement of subunit a and cytoheisn-2 in V-ATPases.
author2 School of Biological Sciences
author_facet School of Biological Sciences
Dip, Phat Vinh
Saw, Wuan Geok
Roessle, Manfred
Marshansky, Vladimir
Grüber, Gerhard
format Article
author Dip, Phat Vinh
Saw, Wuan Geok
Roessle, Manfred
Marshansky, Vladimir
Grüber, Gerhard
author_sort Dip, Phat Vinh
title Solution structure of subunit a, a 104-363, of the Saccharomyces cerevisiae V-ATPase and the importance of its C-terminus in structure formation
title_short Solution structure of subunit a, a 104-363, of the Saccharomyces cerevisiae V-ATPase and the importance of its C-terminus in structure formation
title_full Solution structure of subunit a, a 104-363, of the Saccharomyces cerevisiae V-ATPase and the importance of its C-terminus in structure formation
title_fullStr Solution structure of subunit a, a 104-363, of the Saccharomyces cerevisiae V-ATPase and the importance of its C-terminus in structure formation
title_full_unstemmed Solution structure of subunit a, a 104-363, of the Saccharomyces cerevisiae V-ATPase and the importance of its C-terminus in structure formation
title_sort solution structure of subunit a, a 104-363, of the saccharomyces cerevisiae v-atpase and the importance of its c-terminus in structure formation
publishDate 2013
url https://hdl.handle.net/10356/104131
http://hdl.handle.net/10220/17044
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