Abstract
Bdellovibrio sp. strain W bdellocysts were produced inEscherichia coli using three sources of3H-diaminopimelic acid (DAP) for incorporation into the cyst wall peptidoglycan: (a) labeledE. coli peptidoglycan, (b) labeledBdellovibrio peptidoglycan, and (c) exogenous3H-DAP in the encystment medium. After cysts were produced, they were either sonicated to remove the prey cell wall, or germinated to solubilize the cyst wall. The results show that label was incorporated into the cyst wall preferentially from the exogenous DAP in the medium, and not from the bdellovibrio or bdelloplast peptidoglycan. The encysting bdellovibrio does not therefore incorporate existing peptidoglycan units from the bdelloplast for synthesis of the cyst wall.
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