Together with ARC3 and MCD1, regulates FtsZ ring positioning in chloroplasts in an ARC6-dependent manner (PubMed:29967285, PubMed:28984364, PubMed:23936263). Calcium-dependent ATPase required for the correct placement of the plastid division site. Inhibits FtsZ filament and ring formation in the plastid. Mediates inhibition of plastid division (PubMed:28984364). In cooperation with MINE1, prevents FtsZ ring formation anywhere outside of the mid-plastids. Stimulated ATPase activity by MINE1. Optimum pH is 7.5-8. Active from pH 7 to 9. Homodimer (Probable). Interacts with MINE1 (PubMed:16014621, PubMed:16146521, PubMed:17855384). Binds to ARC3 (PubMed:17304239). Interacts with MCD1 (PubMed:19135368). Interacts with CDP1/PARC6 (PubMed:28984364). Attached to membranes in punctate structures dispersed on the inner envelope and at the mid-chloroplast division site in an ATPase activity-dependent manner (PubMed:29967285). Also present at the chloroplast to a ring structure at the constriction site (PubMed:29967285). Accumulates during seed germination, at the beginning of rapid greening. Heterogeneous population of chloroplasts in mesophyll cells and petals, with normal and larger plastids, due to reduced chloroplast divisions and asymmetrically constricted chloroplasts (PubMed:18204083, PubMed:23936263). Contains highly elongated and multiple-arrayed chloroplasts in developing green tissues (PubMed:18204083). Formation of some FtsZ rings that fail to initiate or progress the membrane constriction of developing chloroplasts (PubMed:18204083). Normal shape and number of etioplasts in cotyledons (PubMed:23936263). Belongs to the ParA family. MinD subfamily.