Cell biology Intelligent Design Irreducible Complexity

The bacterial flagellar hook as a universal joint

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Here’s the Abstract: of an open-access paper:

Fig. 5

Three-layered architecture and the atomic model of the native hook. a The tube, mesh, and spring layers of the hook structure are colored pink, yellow, and cyan, respectively. b The complete atomic model of the native hook (rainbow) with the flagellar basal body (gray) consisting of the C ring, MS ring, and LP ring from the bottom to the top where the rod encapsulated inside the LP ring is directly connected to the bottom of the hook.

The Bacterial flagellar hook is a short supercoiled tubular structure made from a helical assembly of the hook protein FlgE. The hook acts as a universal joint that connects the flagellar basal body and filament, and smoothly transmits torque generated by the rotary motor to the helical filament propeller. In peritrichously flagellated bacteria, the hook allows the filaments to form a bundle behind the cell for swimming, and for the bundle to fall apart for tumbling. Here we report a native supercoiled hook structure at 3.6 Å resolution by cryoEM single particle image analysis of the polyhook. The atomic model built into the three-dimensional (3D) density map reveals the changes in subunit conformation and intersubunit interactions that occur upon compression and extension of the 11 protofilaments during their smoke ring-like rotation. These observations reveal how the hook functions as a dynamic molecular universal joint with high bending flexibility and twisting rigidity. – Kato, T., Makino, F., Miyata, T. et al. Structure of the native supercoiled flagellar hook as a universal joint. Nat Commun 10, 5295 (2019) doi:10.1038/s41467-019-13252-9 More.

A friend points out that the paper just describes the intricate machinery of the hook, adding to what we know, without any resort to Darwinspeak. It seems to be getting safer all the time to just not talk that way any more.

2 Replies to “The bacterial flagellar hook as a universal joint

  1. 1
    polistra says:

    Yup. I’m noticing a small but increasing number of conventional academic articles that say “was designed” instead of “was evolved”.

  2. 2
    BobRyan says:

    Darwinists rather enjoy referring to evolution as fact, despite the simple word taking it out of science. As long as they can call it a fact, then all the evidence in the world does not matter at all. There is no evidence to support macro evolution, despite their best efforts to point to things that never actually support their ideological beliefs. It takes far more faith to believe in macro evolution than it does to believe something with great intellect, far greater than man, created everything. It is only through design and intellect that absolutes can exist in the universe. Nature is chaotic and man always seeks to bring order to the chaos, which means we are driven by far more than nature and are unique as a species.

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