PclR is a transcriptional activator of the gene that encodes the pneumococcal collagen-like protein PclA

Ana Moreno-Blanco, Virtu Solano-Collado, Alejandro Ortuno-Camuñas, Manuel Espinosa, Sofía Ruiz-Cruz*, Alicia Bravo

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)
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The Gram-positive bacterium Streptococcus pneumoniae is a major human pathogen that shows high levels of genetic variability. The pneumococcal R6 genome harbours several gene clusters that are not present in all strains of the species. One of these clusters contains two divergent genes, pclA, which encodes a putative surface-exposed protein that contains large regions of collagen-like repeats, and spr1404 (here named pclR). PclA was shown to mediate pneumococcal adherence to host cells in vitro. In this work, we demonstrate that PclR (494 amino acids) is a transcriptional activator. It stimulates transcription of the pclA gene by binding to a specific DNA site upstream of the core promoter. In addition, we show that PclR has common features with the MgaSpn transcriptional regulator (493 amino acids), which is also encoded by the R6 genome. These proteins have high sequence similarity (60.3%), share the same organization of predicted functional domains, and generate multimeric complexes on linear double-stranded DNAs. However, on the PpclA promoter region, MgaSpn binds to a site different from the one recognized by PclR. Our results indicate that PclR and MgaSpn have similar DNA-binding properties but different DNA-binding specificities, pointing to a different regulatory role of both proteins.

Original languageEnglish
Article number11827
Number of pages14
JournalScientific Reports
Early online date12 Jul 2022
Publication statusPublished - Dec 2022

Bibliographical note

This work was supported by grant PID2019-104553RB-C21 to A.B. from the Spanish Ministry of Science and Innovation.

Data Availability Statement

All data generated and analysed during this study are included in this Manuscript and the Supplementary Information file. The sequences of genes and proteins analysed in the current study are available in the NCBI database: Locus_tag = SPR_RS06975 (old_locus_tag = spr1404). Gene ID: 60,234,404. https://www.ncbi.nlm.nih.gov/gene/?term=SPR_RS06975. https://www.ncbi.nlm.nih.gov/protein/WP_001245194.1. Locus_tag = SPR_RS08055 (old_locus_tag = spr1622). Gene ID: 60,233,139. https://www.ncbi.nlm.nih.gov/gene/?term=SPR_RS08055. https://www.ncbi.nlm.nih.gov/protein/WP_001205275.1.


  • Microbiology
  • Molecular Biology


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