Morten Kjos

This paper introduces a mild extraction method for Gram-positive bacterial cell wall glycopolymers that preserves structural integrity and yields 17 distinct glycopolymers from 11 species.

This study evaluates the antimicrobial activity of three streptococcal fratricins, finding Zoocin A has broad target range and activity against caries-associated and pathogenic species.

This study shows cyclic di-AMP affects cell division and penicillin susceptibility in Streptococcus pneumoniae by regulating division machinery and cell wall composition.

This paper investigates the biosynthesis and diversity of leaderless multipeptide bacteriocins, identifying new candidates and elucidating regulatory mechanisms in GarKS production.

This study shows that LytF promotes pilus extrusion in Streptococcus sanguinis, enhancing DNA uptake during natural transformation, contrary to previous speculation that it functions as a fratricin.

The paper identifies three nitrite accumulation phenotypes in Stutzerimonas strains and links them to differences in nitrate reduction and nitrite reductase genes.

This study identifies the phage shock protein response as a key factor in Listeria monocytogenes susceptibility to the bacteriocin garvicin KS.

This study investigates the role of MurM and branched cell wall structures in penicillin resistance in Streptococcus pneumoniae, finding no direct correlation between increased branching and resistance.

This study identifies CxaR as an adaptor protein that facilitates ClpXP-mediated degradation of Sle1, regulating cell splitting in Staphylococcus aureus.

This study identifies novel bacterial pathways involved in phage resistance in Staphylococcus aureus and shows how these mutations affect antibiotic susceptibility and virulence.

This study evaluates an antibiotic-free antimicrobial combination of bacteriocins and a peptidoglycan hydrolase for treating bovine mastitis, showing effectiveness against mastitis-causing bacteria in vitro and in vivo.

This study identifies a temperature-sensitive regulatory mechanism in Staphylococcus aureus involving an RNA and ClpXP protease that controls cell division hydrolases.

This study identifies 282 milk-essential genes in Staphylococcus aureus using CRISPRi-seq, highlighting purine biosynthesis, folate cycle, and metal acquisition as critical for growth in milk.

The paper identifies ScrM, a competence-induced murein hydrolase in Streptococcus dysgalactiae, and shows that ScrI, a Fem-transferase-like protein, mediates self-immunity by modifying peptiglycan to prevent ScrM binding.

The paper traces streptococcal strains from infant stool to other body sites, showing gut-specific strains are linked to adhesin gene differences.

This paper develops a selection-free CRISPRi system in S. aureus that silences virulence genes without antibiotic selection or exogenous inducers, validated in vitro and in vivo.

This study shows that the LytSR two-component system in Streptococcus agalactiae enhances vaginal colonization and virulence by promoting biofilm formation and inflammatory responses.

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.

This study identifies CozE proteins as regulators of lipoteichoic acid biosynthesis and membrane homeostasis in Staphylococcus aureus through genetic and biochemical analyses.