Doublet microtubules (DMTs) are flagellar components required for the protist ( ) to swim through the human genitourinary tract to cause trichomoniasis, the most common non-viral sexually transmitted disease. Lack of DMT structures has prevented structure-guided drug design to manage infection. Here, we determined the cryo-EM structure of native DMTs, identifying 29 unique proteins, including 18 microtubule inner proteins and 9 microtubule outer proteins.
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