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- W2803670094 abstract "Chloroplasts host photosynthesis and fulfill other metabolic functions that are essential to plant life. They have to divide by binary fission to maintain their numbers throughout cycles of cell division. Chloroplast division is achieved by a complex ring-shaped division machinery located on both the inner (stromal) and the outer (cytosolic) side of the chloroplast envelope. The inner division ring (termed the Z ring) is formed by the assembly of tubulin-like FtsZ1 and FtsZ2 proteins. ARC6 is a key chloroplast division protein that interacts with the Z ring. ARC6 spans the inner envelope membrane, is known to stabilize or maintain the Z ring, and anchors the Z ring to the inner membrane through interaction with FtsZ2. The underlying mechanism of Z ring stabilization is not well-understood. Here, biochemical and structural characterization of ARC6 was conducted using light scattering, sedimentation, and light and transmission EM. The recombinant protein was purified as a dimer. The results indicated that a truncated form of ARC6 (tARC6), representing the stromal portion of ARC6, affects FtsZ2 assembly without forming higher-order structures and exerts its effect via FtsZ2 dynamics. tARC6 prevented GDP-induced FtsZ2 disassembly and caused a significant net increase in FtsZ2 assembly when GDP was present. Single particle analysis and 3D reconstruction were performed to elucidate the structural basis of ARC6 activity. Together, the data reveal that a dimeric form of tARC6 binds to FtsZ2 filaments and does not increase FtsZ polymerization rates but rather inhibits GDP-associated FtsZ2 disassembly." @default.
- W2803670094 created "2018-06-01" @default.
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- W2803670094 date "2018-07-01" @default.
- W2803670094 modified "2023-10-16" @default.
- W2803670094 title "The chloroplast division protein ARC6 acts to inhibit disassembly of GDP-bound FtsZ2" @default.
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- W2803670094 doi "https://doi.org/10.1074/jbc.ra117.000999" @default.
- W2803670094 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6036205" @default.
- W2803670094 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/29769312" @default.
- W2803670094 hasPublicationYear "2018" @default.
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