D. Frees

The Spx stress regulator confers high-level β-lactam resistance and decreases susceptibility to last-line antibiotics in methicillin resistant Staphylococcus aureus

This study identifies Spx as a stress regulator that enhances β-lactam resistance and reduces susceptibility to last-line antibiotics in MRSA through a redox-independent mechanism.

Novel determinant of antibiotic resistance: a clinically selected Staphylococcus aureus clpP mutant survives daptomycin treatment by reducing binding of the antibiotic and adapting a rod-shaped morphology

The paper identifies a clpP SNP mutation in MRSA that reduces daptomycin binding and enables survival through rod-shaped morphology, contributing to antibiotic resistance.

Rapid in vivo development of resistance to daptomycin in vancomycin-resistant Enterococcus faecium due to genomic rearrangements

This study identifies genomic rearrangements as the mechanism for daptomycin resistance in VREfm after combination therapy.

The Sle1 Cell Wall Amidase Controls Daughter Cell Splitting, Cell Size, and β-Lactam Resistance in Community Acquired Methicillin Resistant Staphylococcus aureus USA300

This study identifies Sle1 as a key factor in β-lactam resistance in MRSA USA300, showing that high Sle1 levels promote cell separation and reduce oxacillin sensitivity.

SosA inhibits cell division in Staphylococcus aureus in response to DNA damage

This paper identifies SosA as a DNA-damage-inducible cell-division inhibitor in Staphylococcus aureus, showing it halts division at a specific stage and is regulated by membrane protease CtpA.

The ClpX chaperone controls the Staphylococcus aureus cell cycle but can be bypassed by β-lactam antibiotics

This paper shows that β-lactam antibiotics can bypass the growth defect of S. aureus clpX mutants by restoring septum synthesis and preventing premature cell lysis.