Abstract
The baseplate of bacteriophage T4 is a multiprotein molecular machine that controls host cell recognition, attachment, tail sheath contraction and viral DNA ejection. We report here the three-dimensional structure of the baseplate–tail tube complex determined to a resolution of 12 Å by cryoelectron microscopy. The baseplate has a six-fold symmetric, dome-like structure ∼520 Å in diameter and ∼270 Å long, assembled around a central hub. A 940 Å–long and 96 Å–diameter tail tube, coaxial with the hub, is connected to the top of the baseplate. At the center of the dome is a needle-like structure that was previously identified as a cell puncturing device. We have identified the locations of six proteins with known atomic structures, and established the position and shape of several other baseplate proteins. The baseplate structure suggests a mechanism of baseplate triggering and structural transition during the initial stages of T4 infection.
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Acknowledgements
We are grateful for a Keck Foundation Grant for the purchase of the CM300 FEG electron microscope. We thank S. Wilder and C. Towell for help in the preparation of the manuscript. The work was supported by a US National Science Foundation grant to M.G.R., a Howard Hughes Medical Institute grant and Russian Fund for Basic Research grant to V.V.M. and a Russian Fund for Basic Research grant to V.A.K. This work is an initiation of a T4 structural genomics project supported by a Human Frontiers Science Program grant to M.G.R., F.A. and V.V.M.
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Kostyuchenko, V., Leiman, P., Chipman, P. et al. Three-dimensional structure of bacteriophage T4 baseplate. Nat Struct Mol Biol 10, 688–693 (2003). https://doi.org/10.1038/nsb970
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DOI: https://doi.org/10.1038/nsb970
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