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. 1994 Apr;104(4):1287–1294. doi: 10.1104/pp.104.4.1287

Characterization of the kinetic, regulatory, and structural properties of ADP-glucose pyrophosphorylase from Chlamydomonas reinhardtii.

A A Iglesias 1, Y Y Charng 1, S Ball 1, J Preiss 1
PMCID: PMC159292  PMID: 8016263

Abstract

ADP-glucose pyrophosphorylase (ADP-Glc PPase) from Chlamydomonas reinhardtii cells was purified over 2000-fold to a specific activity of 81 units/mg protein, and its kinetic and regulatory properties were characterized. Inorganic orthophosphate and 3-phosphoglycerate were the most potent inhibitor and activator, respectively. Rabbit antiserum raised against the spinach leaf ADP-Glc PPase (but not the one raised against the enzyme from Escherichia coli) inhibited the activity of the purified algal enzyme, which migrated as a single protein band in native polyacrylamide gel electrophoresis. Two-dimensional and sodium dodecyl sulfate-polyacrylamide gel electrophoresis indicate that the enzyme from C. reinhardtii is composed of two subunits with molecular masses of 50 and 53 kD, respectively. The molecular mass of the native enzyme is estimated to be 210 kD. Antisera raised against the spinach leaf holoenzyme and against the 51-kD spinach subunit cross-reacted with both subunits of the algal ADP-Glc PPase in immunoblot hybridization, but the cross-reaction was stronger for the 50-kD algal subunit than for the 53-kD subunit. No cross-reaction was observed when antiserum raised against the spinach leaf pyrophosphorylase 54-kD subunit was used. These results suggest that the ADP-Glc PPase from C. reinhardtii is a heterotetrameric protein, since the enzyme from higher plants and its two subunits are structurally more related to the small subunit of the spinach leaf enzyme than to its large subunit. This information is discussed in the context of the possible evolutionary changes leading from the bacterial ADP-Glc PPase to the cyanobacterial and higher plant enzymes.

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Selected References

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