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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Grüber, Gerhard Basak, Sandip Lim, Jackwee Manimekalai, Malathy Sony Subramanian Balakrishna, Asha Manikkoth |
| Description | Author Affiliation: Basak S ( Nanyang Technological University, School of Biological Sciences, 60 Nanyang Drive, Singapore 637551, Singapore.) |
| Abstract | Subunit F of V-ATPases is proposed to undergo structural alterations during catalysis and reversible dissociation from the V1VO complex. Recently, we determined the low resolution structure of F from Saccharomyces cerevisiae V-ATPase, showing an N-terminal egg shape, connected to a C-terminal hook-like segment via a linker region. To understand the mechanistic role of subunit F of S. cerevisiae V-ATPase, composed of 118 amino acids, the crystal structure of the major part of F, F(1-94), was solved at 2.3 â « resolution. The structural features were confirmed by solution NMR spectroscopy using the entire F subunit. The eukaryotic F subunit consists of the N-terminal F(1-94) domain with four-parallel ß-strands, which are intermittently surrounded by four -helices, and the C terminus, including the 5-helix encompassing residues 103 to 113. Two loops (26)GQITPETQEK(35) and (60)ERDDI(64) are described to be essential in mechanistic processes of the V-ATPase enzyme. The (26)GQITPETQEK(35) loop becomes exposed when fitted into the recently determined EM structure of the yeast V1VO-ATPase. A mechanism is proposed in which the (26)GQITPETQEK(35) loop of subunit F and the flexible C-terminal domain of subunit H move in proximity, leading to an inhibitory effect of ATPase activity in V1. Subunits D and F are demonstrated to interact with subunit d. Together with NMR dynamics, the role of subunit F has been discussed in the light of its interactions in the processes of reversible disassembly and ATP hydrolysis of V-ATPases by transmitting movements of subunit d and H of the VO and V1 sector, respectively. |
| ISSN | 00219258 |
| e-ISSN | 1083351X |
| Journal | Journal of Biological Chemistry |
| Issue Number | 17 |
| Volume Number | 288 |
| Language | English |
| Publisher | American Society for Biochemistry and Molecular Biology (United States) |
| Publisher Date | 2013-04-26 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Protein Subunits Chemistry Saccharomyces Cerevisiae Proteins Saccharomyces Cerevisiae Enzymology Vacuolar Proton-Translocating ATPases Adenosine Triphosphate Genetics Metabolism Crystallography, X-Ray Hydrolysis Nuclear Magnetic Resonance, Biomolecular Protein Structure, Secondary Protein Structure, Tertiary Research Support, Non-U.S. Gov't Biochemistry Molecular Biology |
| Content Type | Text |
| Resource Type | Article |
| Subject | Cell Biology Biochemistry Molecular Biology |
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