MAW point mutation impairs H. Seropedicae RecA ATP hydrolysis and DNA repair without inducing large conformational changes in its structure
| Autor: | Maria B. R. Steffens, Carolina Weigert Galvão, Sérgio da Costa Saab, Fernando Ribeiro Gomes, Renato Ferras Penteado, Rafael Mazer Etto, Jorge Iulek, Wellington Claiton Leite |
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| Rok vydání: | 2019 |
| Předmět: |
Herbaspirillum
DNA Repair Ultraviolet Rays DNA repair Science ATPase Amino Acid Motifs DNA Single-Stranded Molecular Dynamics Simulation 01 natural sciences 03 medical and health sciences chemistry.chemical_compound Adenosine Triphosphate Protein structure ATP hydrolysis 0103 physical sciences Escherichia coli Point Mutation Binding site 030304 developmental biology Adenosine Triphosphatases 0303 health sciences Binding Sites Multidisciplinary 010304 chemical physics biology Chemistry Hydrolysis Point mutation Protein Structure Tertiary DNA binding site Rec A Recombinases biology.protein Biophysics Medicine DNA Protein Binding |
| Zdroj: | PLoS ONE, Vol 14, Iss 4, p e0214601 (2019) |
| ISSN: | 1932-6203 |
| Popis: | RecA is a multifunctional protein that plays a central role in DNA repair in bacteria. The structural Make ATP Work motif (MAW) is proposed to control the ATPase activity of RecA. In the present work, we report the biochemical activity and structural effects of the L53Q mutation at the MAW motif of the RecA protein from H. seropedicae (HsRecA L53Q). In vitro studies showed that HsRecA L53Q can bind ADP, ATP, and ssDNA, as does wild-type RecA. However, the ATPase and DNA-strand exchange activities were completely lost. In vivo studies showed that the expression of HsRecA L53Q in E. coli recA1 does not change its phenotype when cells were challenged with MMS and UV. Molecular dynamics simulations showed the L53Q point mutation did not cause large conformational changes in the HsRecA structure. However, there is a difference on dynamical cross-correlation movements of the residues involved in contacts within the ATP binding site and regions that hold the DNA binding sites. Additionally, a new hydrogen bond, formed between Q53 and T49, was hypothesized to allow an independent motion of the MAW motif from the hydrophobic core, what could explain the observed loss of activity of HsRecA L53Q. |
| Databáze: | OpenAIRE |
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