A second hybrid-binding domain modulates the activity of Drosophila ribonuclease H1.

Abstract:

:In eukaryotes, ribonuclease H1 (RNase H1) is involved in the processing and removal of RNA/DNA hybrids in both nuclear and mitochondrial DNA. The enzyme comprises a C-terminal catalytic domain and an N-terminal hybrid-binding domain (HBD), separated by a linker of variable length, 115 amino acids in Drosophila melanogaster (Dm). Molecular modelling predicted this extended linker to fold into a structure similar to the conserved HBD. Based on a deletion series, both the catalytic domain and the conserved HBD were required for high-affinity binding to heteroduplex substrates, while loss of the novel HBD led to an ∼90% drop in Kcat with a decreased KM, and a large increase in the stability of the RNA/DNA hybrid-enzyme complex, supporting a bipartite-binding model in which the second HBD facilitates processivity. Shotgun proteomics following in vivo cross-linking identified single-stranded DNA-binding proteins from both nuclear and mitochondrial compartments, respectively RpA-70 and mtSSB, as prominent interaction partners of Dm RNase H1. However, we were not able to document direct and stable interactions with mtSSB when the proteins were co-overexpressed in S2 cells, and functional interactions between them in vitro were minor.

journal_name

J Biochem

journal_title

Journal of biochemistry

authors

González de Cózar JM,Carretero-Junquera M,Ciesielski GL,Miettinen SM,Varjosalo M,Kaguni LS,Dufour E,Jacobs HT

doi

10.1093/jb/mvaa067

subject

Has Abstract

pub_date

2020-11-01 00:00:00

pages

515-533

issue

5

eissn

0021-924X

issn

1756-2651

pii

5863254

journal_volume

168

pub_type

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