Structures of Zymomonas 2-Keto-3-Deoxy-6-Phosphogluconate Aldolase with and without a Substrate Analog at the Phosphate-Binding Loop
2018
Seo, P.W., Chonnam National University, Gwangju, Republic of Korea | Ryu, H.C., Chonnam National University, Gwangju, Republic of Korea | Gu, D.H., Chonnam National University, Gwangju, Republic of Korea | Park, H.S., Chonnam National University, Gwangju, Republic of Korea | Park, S.Y., Pohang Accelerator Laboratory, Pohang, Republic of Korea | Kim, J.S., Chonnam National University, Gwangju, Republic of Korea
2-Keto-3-deoxy-6-phosphogluconate (KDPG) aldolase, which catalyzes aldol cleavage and condensation reactions, has two distinct substrate-binding sites. The substrate-binding mode at the catalytic site and Schiff-base formation have been well studied. However, structural information on the phosphate-binding loop (P-loop) is limited. Zymomonas mobilis KDPG aldolase is one of the aldolases with a wide substrate spectrum. Its structure in complex with the substrate-mimicking 3-phosphoglycerate (3PG) shows that the phosphate moiety of 3PG interacts with the P-loop and a nearby conserved serine residue. 3PG-binding to the P-loop replaces water molecules aligned from the P-loop to the catalytic site, as observed in the apostructure. The extra electron density near the P-loop and comparison with other aldolases suggest the diversity and flexibility of the serine-containing loop among KDPG aldolases. These structural data may help to understand the substrate-binding mode and the broad substrate specificity of the Zymomonas KDPG aldolase.
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