Identification of 2H phosphoesterase superfamily proteins with 2'-CPDase activity.
Biochimie 2019;
165:235-244. [PMID:
31422053 DOI:
10.1016/j.biochi.2019.08.008]
[Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2019] [Accepted: 08/13/2019] [Indexed: 12/22/2022]
Abstract
The 2H phosphoesterase superfamily (2H family) proteins are widely conserved among organisms. The 2H family is classified into several subgroups, including YjcG-like proteins whose enzymatic activity has not been reported. In the present study, we found that two YjcG-like proteins (Staphylococcus aureus SA0873 and Bacillus subtilis YjcG) have 2'-CPDase activity that hydrolyzes a 2',3'-cyclic nucleotide, thereby producing a nucleotide with a 3'-phosphate. The SA0873 protein selectively hydrolyzes a 2',3'-cyclic nucleotide with a purine base. Four SA0873 mutant proteins (H34A, T36A, H115A, and T117A), in which alanine was substituted for amino acid residues in the HxT/Sx motifs that are conserved in the 2H family, abolished the 2'-CPDase activity. Comparison of three-dimensional structures between the YjcG-like proteins with 2'-CPDase activity and another 2H family subgroup, LigT/2'-5' RNA ligase-like proteins with 3'-CPDase activity, revealed that the orientation of the substrate binding pocket is reversed between the two groups. Our findings revealed that YjcG-like proteins not only have a substrate-binding pocket different from that of LigT/2'-5' RNA ligase-like proteins, but they also have 2'-CPDase activity.
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