Target type: cellularcomponent
The segment of the sperm flagellum where the mitochondrial sheath ends, and the outer dense fibers (ODFs) associated with outer axonemal doublets 3 and 8 are replaced by the 2 longitudinal columns of the fibrous sheath (FS) which run the length of the principal piece and are stabilized by circumferential ribs. The principal piece makes up ~2/3 of the length of the sperm flagellum and is defined by the presence of the FS and of only 7 (rather than 9) ODFs which taper and then terminate near the distal end of the principal piece. [GOC:cjm, MP:0009836]
| Protein | Definition | Taxonomy |
|---|---|---|
| Sodium/hydrogen exchanger 9B2 | A sodium/hydrogen exchanger 9B2 that is encoded in the genome of human. [PRO:DNx, UniProtKB:Q86UD5] | Homo sapiens (human) |
| Amiloride-sensitive sodium channel subunit alpha | An amiloride-sensitive sodium channel subunit alpha that is encoded in the genome of human. [PRO:DNx, UniProtKB:P37088] | Homo sapiens (human) |
| Compound | Definition | Classes | Roles |
|---|---|---|---|
| phloretin | dihydrochalcones | antineoplastic agent; plant metabolite | |
| amiloride | amiloride : A member of the class of pyrazines resulting from the formal monoacylation of guanidine with the carboxy group of 3,5-diamino-6-chloropyrazine-2-carboxylic acid. Amiloride: A pyrazine compound inhibiting SODIUM reabsorption through SODIUM CHANNELS in renal EPITHELIAL CELLS. This inhibition creates a negative potential in the luminal membranes of principal cells, located in the distal convoluted tubule and collecting duct. Negative potential reduces secretion of potassium and hydrogen ions. Amiloride is used in conjunction with DIURETICS to spare POTASSIUM loss. (From Gilman et al., Goodman and Gilman's The Pharmacological Basis of Therapeutics, 9th ed, p705) | aromatic amine; guanidines; organochlorine compound; pyrazines | diuretic; sodium channel blocker |
| benzamil | guanidines; pyrazines | ||
| phenylamil | phenylamil: irreversible inhibitor of sodium channels in the toad urinary bladder | guanidines; pyrazines |