Ahmet hulusi kuran tefsiri
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Most interestingly, it was found that FtsZ’s treadmilling dynamics drive processive movements of the essential sPG transpeptidase (TPase, FtsI in E. New studies employing super-resolution and single-molecule imaging in vitro and in vivo have demonstrated that the FtsZ polymers exhibit GTP hydrolysis-driven treadmilling dynamics, which are the continuous polymerization at one end and depolymerization at the other end, with individual FtsZ monomers remaining stationary in the middle 12, 13, 14, 15.
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The Z-ring then locally recruits an ensemble of more than 30 proteins, many of which are sPG-remodeling enzymes 1, 11, to initiate septal cell wall constriction. During cell division, FtsZ polymerizes at the cytoplasmic face of the inner membrane to form a ring-like structure (Z-ring) at mid-cell 8, 9, 10. FtsZ is a highly conserved bacterial tubulin homolog and GTPase 5, 6, 7. Recent studies have indicated that FtsZ, an essential component of the bacterial cell division machinery, may play a central part in regulating the spatiotemporal coordination of sPG synthesis enzymes. Perturbations of PG remodeling at septum compromise cell division and often lead to cell lysis 4. However, it remains unclear how these proteins are orchestrated in time and space to achieve successful cytokinesis, and at the same time maintain the structural integrity of the septal cell wall 2, 3. A large number of the cell wall enzymes involved in this process and their regulators have been identified. During cell wall constriction in most Gram-negative bacteria, new septal peptidoglycan (sPG) synthesis and old cell wall degradation occur simultaneously 1.