Title

Identification of the Minimal Bacterial 2'-deoxy-7-amido-7-deazaguanine Synthesis Machinery

Published In

Molecular Microbiology

Document Type

Citation

Publication Date

11-18-2018

Abstract

Summary: The 7?deazapurine derivatives, 2??deoxy?7?cyano?7?deazaguanosine (dPreQ0) and 2??deoxy?7?amido?7?deazaguanosine (dADG) are recently discovered DNA modifications encoded by the dpd cluster found in a diverse set of bacteria. Here we identify the genes required for the formation of dPreQ0 and dADG in DNA and propose a biosynthetic pathway. The preQ0 base is a precursor that in Salmonella Montevideo, is synthesized as an intermediate in the pathway of the tRNA modification queuosine. Of the 11 genes (dpdA – dpdK) found in the S. Montevideo dpd cluster, dpdA and dpdB are necessary and sufficient to synthesize dPreQ0, while dpdC is additionally required for dADG synthesis. Among the rest of the dpd genes, dpdE, dpdG, dpdI, dpdK, dpdD and possibly dpdJ appear to be involved in a restriction?like phenotype. Indirect competition for preQ0 base led to a model for dADG synthesis in which DpdA inserts preQ0 into DNA with the help of DpdB, and then DpdC hydrolyzes dPreQ0 to dADG. The role of DpdB is not entirely clear as it is dispensable in other dpd clusters. Our discovery of a minimal gene set for introducing 7?deazapurine derivatives in DNA provides new tools for biotechnology applications and demonstrates the interplay between the DNA and RNA modification machineries. DNA modifications allow bacteria to recognize self from non?self. We describe a novel pathway responsible for the insertion of a complex modification that was thought to be found only in RNA.

Description

Hey Vivian! Look here for author affiliations https://www.ncbi.nlm.nih.gov/pubmed/30159947

Locate the Document

http://doi.org/10.1111/mmi.14113

DOI

10.1111/mmi.14113

Persistent Identifier

https://archives.pdx.edu/ds/psu/27047

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