The Nucleoid-Associated Protein GapR Uses Conserved Structural Elements To Oligomerize and Bind DNA

ABSTRACT Nucleoid-associated proteins (NAPs) are DNA binding proteins critical for the organization and function of the bacterial chromosome. A newly discovered NAP in Caulobacter crescentus, GapR, is thought to facilitate the movement of the replication and transcription machines along the chromoso...

Descripción completa

Guardado en:
Detalles Bibliográficos
Autores principales: Rogério F. Lourenço, Saumya Saurabh, Jonathan Herrmann, Soichi Wakatsuki, Lucy Shapiro
Formato: article
Lenguaje:EN
Publicado: American Society for Microbiology 2020
Materias:
Acceso en línea:https://doaj.org/article/ff39ddc55b124ac6ad9212defcce9961
Etiquetas: Agregar Etiqueta
Sin Etiquetas, Sea el primero en etiquetar este registro!
id oai:doaj.org-article:ff39ddc55b124ac6ad9212defcce9961
record_format dspace
spelling oai:doaj.org-article:ff39ddc55b124ac6ad9212defcce99612021-11-15T15:56:47ZThe Nucleoid-Associated Protein GapR Uses Conserved Structural Elements To Oligomerize and Bind DNA10.1128/mBio.00448-202150-7511https://doaj.org/article/ff39ddc55b124ac6ad9212defcce99612020-06-01T00:00:00Zhttps://journals.asm.org/doi/10.1128/mBio.00448-20https://doaj.org/toc/2150-7511ABSTRACT Nucleoid-associated proteins (NAPs) are DNA binding proteins critical for the organization and function of the bacterial chromosome. A newly discovered NAP in Caulobacter crescentus, GapR, is thought to facilitate the movement of the replication and transcription machines along the chromosome by stimulating type II topoisomerases to remove positive supercoiling. Here, utilizing genetic, biochemical, and biophysical studies of GapR in light of a recently published DNA-bound crystal structure of GapR, we identified the structural elements involved in oligomerization and DNA binding. Moreover, we show that GapR is maintained as a tetramer upon its dissociation from DNA and that tetrameric GapR is capable of binding DNA molecules in vitro. Analysis of protein chimeras revealed that two helices of GapR are functionally conserved in H-NS, demonstrating that two evolutionarily distant NAPs with distinct mechanisms of action utilize conserved structural elements to oligomerize and bind DNA. IMPORTANCE Bacteria organize their genetic material in a structure called the nucleoid, which needs to be compact to fit inside the cell and, at the same time, dynamic to allow high rates of replication and transcription. Nucleoid-associated proteins (NAPs) play a pivotal role in this process, so their detailed characterization is crucial for our understanding of DNA organization into bacterial cells. Even though NAPs affect DNA-related processes differently, all of them have to oligomerize and bind DNA for their function. The significance of this study is the identification of structural elements involved in the oligomerization and DNA binding of a newly discovered NAP in C. crescentus and the demonstration that structural elements are conserved in evolutionarily distant and functionally distinct NAPs.Rogério F. LourençoSaumya SaurabhJonathan HerrmannSoichi WakatsukiLucy ShapiroAmerican Society for Microbiologyarticlenucleoid-associated proteinoligomeric stateDNA bindingstructure/function conservationMicrobiologyQR1-502ENmBio, Vol 11, Iss 3 (2020)
institution DOAJ
collection DOAJ
language EN
topic nucleoid-associated protein
oligomeric state
DNA binding
structure/function conservation
Microbiology
QR1-502
spellingShingle nucleoid-associated protein
oligomeric state
DNA binding
structure/function conservation
Microbiology
QR1-502
Rogério F. Lourenço
Saumya Saurabh
Jonathan Herrmann
Soichi Wakatsuki
Lucy Shapiro
The Nucleoid-Associated Protein GapR Uses Conserved Structural Elements To Oligomerize and Bind DNA
description ABSTRACT Nucleoid-associated proteins (NAPs) are DNA binding proteins critical for the organization and function of the bacterial chromosome. A newly discovered NAP in Caulobacter crescentus, GapR, is thought to facilitate the movement of the replication and transcription machines along the chromosome by stimulating type II topoisomerases to remove positive supercoiling. Here, utilizing genetic, biochemical, and biophysical studies of GapR in light of a recently published DNA-bound crystal structure of GapR, we identified the structural elements involved in oligomerization and DNA binding. Moreover, we show that GapR is maintained as a tetramer upon its dissociation from DNA and that tetrameric GapR is capable of binding DNA molecules in vitro. Analysis of protein chimeras revealed that two helices of GapR are functionally conserved in H-NS, demonstrating that two evolutionarily distant NAPs with distinct mechanisms of action utilize conserved structural elements to oligomerize and bind DNA. IMPORTANCE Bacteria organize their genetic material in a structure called the nucleoid, which needs to be compact to fit inside the cell and, at the same time, dynamic to allow high rates of replication and transcription. Nucleoid-associated proteins (NAPs) play a pivotal role in this process, so their detailed characterization is crucial for our understanding of DNA organization into bacterial cells. Even though NAPs affect DNA-related processes differently, all of them have to oligomerize and bind DNA for their function. The significance of this study is the identification of structural elements involved in the oligomerization and DNA binding of a newly discovered NAP in C. crescentus and the demonstration that structural elements are conserved in evolutionarily distant and functionally distinct NAPs.
format article
author Rogério F. Lourenço
Saumya Saurabh
Jonathan Herrmann
Soichi Wakatsuki
Lucy Shapiro
author_facet Rogério F. Lourenço
Saumya Saurabh
Jonathan Herrmann
Soichi Wakatsuki
Lucy Shapiro
author_sort Rogério F. Lourenço
title The Nucleoid-Associated Protein GapR Uses Conserved Structural Elements To Oligomerize and Bind DNA
title_short The Nucleoid-Associated Protein GapR Uses Conserved Structural Elements To Oligomerize and Bind DNA
title_full The Nucleoid-Associated Protein GapR Uses Conserved Structural Elements To Oligomerize and Bind DNA
title_fullStr The Nucleoid-Associated Protein GapR Uses Conserved Structural Elements To Oligomerize and Bind DNA
title_full_unstemmed The Nucleoid-Associated Protein GapR Uses Conserved Structural Elements To Oligomerize and Bind DNA
title_sort nucleoid-associated protein gapr uses conserved structural elements to oligomerize and bind dna
publisher American Society for Microbiology
publishDate 2020
url https://doaj.org/article/ff39ddc55b124ac6ad9212defcce9961
work_keys_str_mv AT rogerioflourenco thenucleoidassociatedproteingaprusesconservedstructuralelementstooligomerizeandbinddna
AT saumyasaurabh thenucleoidassociatedproteingaprusesconservedstructuralelementstooligomerizeandbinddna
AT jonathanherrmann thenucleoidassociatedproteingaprusesconservedstructuralelementstooligomerizeandbinddna
AT soichiwakatsuki thenucleoidassociatedproteingaprusesconservedstructuralelementstooligomerizeandbinddna
AT lucyshapiro thenucleoidassociatedproteingaprusesconservedstructuralelementstooligomerizeandbinddna
AT rogerioflourenco nucleoidassociatedproteingaprusesconservedstructuralelementstooligomerizeandbinddna
AT saumyasaurabh nucleoidassociatedproteingaprusesconservedstructuralelementstooligomerizeandbinddna
AT jonathanherrmann nucleoidassociatedproteingaprusesconservedstructuralelementstooligomerizeandbinddna
AT soichiwakatsuki nucleoidassociatedproteingaprusesconservedstructuralelementstooligomerizeandbinddna
AT lucyshapiro nucleoidassociatedproteingaprusesconservedstructuralelementstooligomerizeandbinddna
_version_ 1718427131764015104