Journal
JOURNAL OF CELL BIOLOGY
Volume 183, Issue 5, Pages 923-932Publisher
ROCKEFELLER UNIV PRESS
DOI: 10.1083/jcb.200808050
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Funding
- Swiss National Science Foundation
- National Centres of Competence in Research Structural Biology [NF 3100A0-107540]
- Special Coordination Funds for Promoting Science and Technology [16083207]
- Ministry of Education, Culture, Sports, Science and Technology
- Grants-in-Aid for Scientific Research [16083207] Funding Source: KAKEN
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The inner dynein arm regulates axonemal bending motion in eukaryotes. We used cryo-electron tomography to reconstruct the three-dimensional structure of inner dynein arms from Chlamydomonas reinhardtii. All the eight different heavy chains were identified in one 96-nm periodic repeat, as expected from previous biochemical studies. Based on mutants, we identified the positions of the AAA rings and the N-terminal tails of all the eight heavy chains. The dynein f dimer is located close to the surface of the A-microtubule, whereas the other six heavy chain rings are roughly colinear at a larger distance to form three dyads. Each dyad consists of two heavy chains and has a corresponding radial spoke or a similar feature. In each of the six heavy chains (dynein a, b, c, d, e, and g), the N-terminal tail extends from the distal side of the ring. To interact with the B-microtubule through stalks, the inner-arm dyneins must have either different handedness or, more probably, the opposite orientation of the AAA rings compared with the outer-arm dyneins.
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