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Inter‐subunit interaction and quaternary rearrangement defined by the central stalk of prokaryotic V 1 ‐ATPase
Author(s) -
Numoto Nobutaka,
Hasegawa Yu,
Takeda Kazuki,
Miki Kunio
Publication year - 2009
Publication title -
embo reports
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 4.584
H-Index - 184
eISSN - 1469-3178
pISSN - 1469-221X
DOI - 10.1038/embor.2009.202
Subject(s) - thermus thermophilus , atpase , protein subunit , stalk , protein quaternary structure , biology , atp synthase , f atpase , stereochemistry , crystallography , aaa proteins , biophysics , chemistry , biochemistry , enzyme , escherichia coli , chloroplast , thylakoid , horticulture , gene
V‐type ATPases (V‐ATPases) are categorized as rotary ATP synthase/ATPase complexes. The V‐ATPases are distinct from F‐ATPases in terms of their rotation scheme, architecture and subunit composition. However, there is no detailed structural information on V‐ATPases despite the abundant biochemical and biophysical research. Here, we report a crystallographic study of V 1 ‐ATPase, from Thermus thermophilus , which is a soluble component consisting of A, B, D and F subunits. The structure at 4.5 Å resolution reveals inter‐subunit interactions and nucleotide binding. In particular, the structure of the central stalk composed of D and F subunits was shown to be characteristic of V 1 ‐ATPases. Small conformational changes of respective subunits and significant rearrangement of the quaternary structure observed in the three AB pairs were related to the interaction with the straight central stalk. The rotation mechanism is discussed based on a structural comparison between V 1 ‐ATPases and F 1 ‐ATPases.