Antibiotic-induced cell chaining triggers pneumococcal competence by reshaping quorum sensing to autocrine-like signaling

A Domenech, J Slager, JW Veening - Cell reports, 2018 - cell.com
Streptococcus pneumoniae can acquire antibiotic resistance by activation of competence
and subsequent DNA uptake. Here, we demonstrate that aztreonam (ATM) and clavulanic …

Rgg-Shp regulators are important for pneumococcal colonization and invasion through their effect on mannose utilization and capsule synthesis

X Zhi, IT Abdullah, O Gazioglu, I Manzoor, S Shafeeq… - Scientific Reports, 2018 - nature.com
Microbes communicate with each other by using quorum sensing (QS) systems and
modulate their collective 'behavior'for in-host colonization and virulence, biofilm formation …

Pneumococcal galactose catabolism is controlled by multiple regulators acting on pyruvate formate lyase

FAY Al-Bayati, HFH Kahya, A Damianou, S Shafeeq… - Scientific reports, 2017 - nature.com
Catabolism of galactose by Streptococcus pneumoniae alters the microbe's metabolism from
homolactic to mixed acid fermentation, and this shift is linked to the microbe's virulence …

TprA/PhrA quorum sensing system has a major effect on pneumococcal survival in respiratory tract and blood, and its activity is controlled by CcpA and GlnR

AS Motib, FAY Al-Bayati, I Manzoor… - Frontiers in cellular …, 2019 - frontiersin.org
Streptococcus pneumoniae is able to cause deadly diseases by infecting different tissues,
each with distinct environmental and nutritional compositions. We hypothesize that the …

Niacin-mediated Gene Expression and Role of NiaR as a Transcriptional Repressor of niaX, nadC, and pnuC in Streptococcus pneumoniae

M Afzal, OP Kuipers, S Shafeeq - Frontiers in cellular and infection …, 2017 - frontiersin.org
NAD (Nicotinamide Adenine Dinucleotide) biosynthesis is vital for bacterial physiology and
plays an important role in cellular metabolism. A naturally occurring vitamin B complex …

Maltose-Dependent Transcriptional Regulation of the mal Regulon by MalR in Streptococcus pneumoniae

M Afzal, S Shafeeq, I Manzoor, OP Kuipers - PLoS One, 2015 - journals.plos.org
The maltose regulon (mal regulon) has previously been shown to consist of the mal gene
cluster (malMP, malXCD and malAR operons) in Streptococcus pneumoniae. In this study …

Phosphosugar Stress in Bacillus subtilis: Intracellular Accumulation of Mannose 6-Phosphate Derepressed the glcR-phoC Operon from Repression by GlcR

K Morabbi Heravi, I Manzoor, H Watzlawick… - Journal of …, 2019 - Am Soc Microbiol
Bacillus subtilis phosphorylates sugars during or after their transport into the cell.
Perturbation in the conversion of intracellular phosphosugars to the central carbon …

Ni2+-Dependent and PsaR-Mediated Regulation of the Virulence Genes pcpA, psaBCA, and prtA in Streptococcus pneumoniae

I Manzoor, S Shafeeq, OP Kuipers - PLoS One, 2015 - journals.plos.org
Previous studies have shown that the transcriptional regulator PsaR regulates the
expression of the PsaR regulon consisting of genes encoding choline binding protein …

GalR acts as a transcriptional activator of galKT in the presence of galactose in Streptococcus pneumoniae

M Afzal, S Shafeeq, I Manzoor… - Journal of Molecular …, 2016 - karger.com
We explored the regulatory mechanism of Leloir pathway genes in Streptococcus
pneumoniae D39. Here, we demonstrate that the expression of galKT is galactose …

Co2+-dependent gene expression in Streptococcus pneumoniae: opposite effect of Mn2+ and Co2+ on the expression of the virulence genes psaBCA, pcpA, and prtA

I Manzoor, S Shafeeq, TG Kloosterman… - Frontiers in …, 2015 - frontiersin.org
Manganese (Mn2+)-, zinc (Zn2+)-and copper (Cu2+) play significant roles in transcriptional
gene regulation, physiology, and virulence of Streptococcus pneumoniae. So far, the effect …