Crystal structure of the MazG-related nucleoside triphosphate pyrophosphohydrolase from Thermotoga maritima MSB8

Journal of Structural and Functional Genomics
Balasundaram PadmanabhanYoshitaka Bessho

Abstract

The MazG family proteins, which are highly conserved in bacteria, are nucleoside triphosphate pyrophosphohydrolases that hydrolyze all canonical nucleoside triphosphates, and are also involved in removing noncanonical nucleoside triphosphates to prevent their incorporation into DNA or RNA. The primary structure of TM0360 from Thermotoga maritima MSB8 suggested that TM0360 is a MazG-related nucleoside triphosphate pyrophosphohydrolase. The crystal structure of the TM0360 protein was determined by the MAD technique at 2.0 Å resolution. The asymmetric unit contains an intact dimer molecule. The overall structure of TM0360 is similar to the known structures of the dimeric MazG protein and dUTPases. The putative NTP binding pocket in TM0360, identified by considering the probable NTP-interacting residues and structural features, suggested that TM0360 resembles the C-terminal domain of Escherichia coli MazG, although TM0360 may be a truncated paralog of the N-terminal domain of T. maritima MazG (TM0913), according to its primary structure. The putative function of TM0360 is discussed, based on structural homology.

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