6.6.1.1 ? - 644254 6.6.1.1 ? x * 150000, subunit ChlH, SDS-PAGE -, 749215 6.6.1.1 ? x * 153491, calculation from sequence of cDNA, ChlH subunit 644269 6.6.1.1 ? x * 38000, SDS-PAGE, a construct expressing I subunit 644264 6.6.1.1 ? x * 40000 + x * 70000 + x * 140000 661635 6.6.1.1 ? x * 40000, SDS-PAGE, I subunit 644256 6.6.1.1 ? x * 42000, SDS-PAGE, a construct expressing I subunit 644264 6.6.1.1 ? x * 44000, SDS-PAGE, ChlI subunit 644270 6.6.1.1 ? x * 46000, calculation from sequence of cDNA, I subunit 644254, 644256 6.6.1.1 ? x * 60000, calculation from sequence of cDNA, D subunit 644254 6.6.1.1 ? x * 73000, calculation from sequence of cDNA, D subunit 644254 6.6.1.1 ? x * 82900, calculation from sequence of cDNA, D subunit 644274 6.6.1.1 ? x * 87000, calculation from sequence of cDNA, D subunit 644254 6.6.1.1 ? x * 90000-130000, gel filtration, BchI subunit 644261 6.6.1.1 dimer 2 * 40000, BchI subunit 644275 6.6.1.1 heterotrimer 1 * 148000 + 1 * 39000 + 1 * 73000, subunits ChlH, ChlI and ChlD 715033 6.6.1.1 heterotrimer 1 * 150000 + 1 * 70000 + 1 * 40000, SDS-PAGE 747024 6.6.1.1 homodimer 2 * 150000, subunit ChlH, SDS-PAGE 748752 6.6.1.1 additional information - 644254 6.6.1.1 additional information 1 * 110000, gel filtration, BchH subunit 644265 6.6.1.1 additional information 1 * 140000, BchH subunit 644275 6.6.1.1 additional information 1 * 148000, gel filtration, ChlH subunit 644265 6.6.1.1 additional information ChlH forms high-molecular aggregates when preincubated with ATP and Mg2+ 644265 6.6.1.1 additional information ChlI subunit forms high-molecular-mass aggregates 644258 6.6.1.1 additional information enzyme interacts with the next enzyme in the pathway, magnesium protoporphyrine IX methyltransferase BchM. Activitiy of BchM in presence of isoform BchH1 is 132% of the activity of BchM alone 687761 6.6.1.1 additional information enzyme interacts with the next enzyme in the pathway, magnesium protoporphyrine IX methyltransferase BchM. Activitiy of BchM in presence of isoform BchH2 is 157% of the activity of BchM alone 687761 6.6.1.1 additional information enzyme interacts with the next enzyme in the pathway, magnesium protoporphyrine IX methyltransferase BchM. Activitiy of BchM in presence of isoform BchH3 is 68% of the activity of BchM alone 687761 6.6.1.1 additional information enzyme is composed of subunits BchI, BchD, BchH. The BchIBchD complex has intrinsic ATPase activity, and addition of BchH greatly increased ATPase activity. This is concentration-dependent and gives sigmoidal kinetics. ATPase activity is about 40fold higher than magnesium chelatase activity and continues despite cessation of magnesium chelation, implying secondary roles for ATP hydrolysis 693170 6.6.1.1 additional information H subunit is a monomer and I subunit is a dimer, determined by dynamic-light-scattering studies 644254 6.6.1.1 additional information I subunit is hexameric 644255 6.6.1.1 additional information M1 and M2 domains of ChlD subunit participate in homodimerization and interaction between ChlI and ChlD 644260 6.6.1.1 additional information the 40000 Da subunit functions as a chaperon that is esential for the survival of the 70000 Da subunit. The ATPase activity of the 40000 Da subunit is essential for this function. Binding between the two subunits is not sufficient to maintain the 70000 Da subunit in the cell 661635 6.6.1.1 additional information the enzyme has three subunits, BchI, BchH and BchD 644254, 644255, 644264, 644275 6.6.1.1 additional information the enzyme has three subunits, ChlI, ChlH and ChlD 644254, 644256, 644274 6.6.1.1 octamer 8 * 70000, D subunit, the molecular mass of the polymeric protein is approximately 550000 Da 644275 6.6.1.1 trimer 1 * 40000 (I-subunit) + 1 * 70000 (D-subunit) + 1 * 140000 (H-subunit) 671881