Protein of insect sperm mitochondrial crystals. Crystallomitin.

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Abstract
Mitochondrial derivatives of insect [Notonecta glauca] sperm usually contain a crystalline protein that shows a 45-nm main period, made up to 20-nm subperiods, determined by the coiling of filament bundles. Filaments are 2 nm thick and have a globular appearance. The cystals contain 2 main polypeptides, 52,000 and 55,000 daltons. These polypeptides are closely related, contain a high percentage of proline, and are insoluble in sodium dodecyl sulfate due to disulfide cross links. The name crystallomitin is suggested for this class of protein.