Abstract

An intracellular structure previously identified in archaeal cells (Halobacterium salinarum) was studied by electron microscopy of single and serial ultrathin sections. This structure was localized under the cytoplasmic membrane near the cellular poles on both sides of the disc-like lamellar structure (DLS), which we found earlier in the motility apparatus of Hb. salinarum. The organization of this structure differs from that of DLS. Morphological characteristics of the new structure coincide with those of bacterial “polar organelle” (PO) described previously. Similar to PO, the new structure exhibited cytochemical staining that reveals the ATPase activity. The bacterial PO is compared with the analogous structure in archaea.

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