Two distinct mechanisms help to ensure the correct compartmentalization of σF activity in the prespore. a–c | The SpoIIE protein (blue spots) has a phosphatase activity that can overcome the negative regulation of σF by the SpoIIAB protein. SpoIIE is also required for the correct formation of the prespore septum (FIG. 2). SpoIIE is recruited to the FtsZ rings by a direct interaction with FtsZ. The development of the two rings is asymmetrical and the ring that contains the most SpoIIE protein (upper in this case) usually
achieves division first. During or following division, it seems that
the SpoIIE protein becomes enriched in the prespore
compartment, greatly enhancing the likelihood of σF
activation in that compartment. SpoIIE phosphatase activity also seems to
be regulated and it is possible that this regulation responds in
some way to formation of the septum
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