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Lactococcus lactis

  • NisI Maturation and Its Influence on Nisin Resistance in <span class="named-content genus-species" id="named-content-1">Lactococcus lactis</span>
    Environmental Microbiology
    NisI Maturation and Its Influence on Nisin Resistance in Lactococcus lactis

    Nisin, a safe and natural antimicrobial peptide, has a long and impressive history as a food preservative and is also considered a novel candidate to alleviate the increasingly serious threat of antibiotic resistance. Nisin is produced by certain L. lactis strains. The nisin immunity protein NisI, a membrane-bound lipoprotein, is expressed by nisin producers to avoid...

    Jiaheng Liu, Hui Xiong, Yuhui Du, Itsanun Wiwatanaratanabutr, Xiaofang Wu, Guangrong Zhao, Hongji Zhu, Qinggele Caiyin, Jianjun Qiao
  • Open Access
    Editing of the Proteolytic System of <span class="named-content genus-species" id="named-content-1">Lactococcus lactis</span> Increases Its Bioactive Potential
    Food Microbiology | Spotlight
    Editing of the Proteolytic System of Lactococcus lactis Increases Its Bioactive Potential

    Lactic acid bacteria (LAB) are very important for the production of safe and healthy human and animal fermented foods and feed and, increasingly more, in the functional food industry. The intracellular peptidomes of LAB are promising reservoirs of bioactive peptides. We show here that targeted genetic engineering of the peptide degradation pathway allows steering the composition of the peptide pool of the LAB...

    Chenxi Huang, Jan Kok
  • Another Breaker of the Wall: the Biological Function of the Usp45 Protein of <span class="named-content genus-species" id="named-content-1">Lactococcus lactis</span>
    Food Microbiology | Spotlight
    Another Breaker of the Wall: the Biological Function of the Usp45 Protein of Lactococcus lactis

    The cell wall, composed mainly of peptidoglycan, is key to maintaining the cell shape and protecting the cell from bursting. Peptidoglycan degradation by peptidoglycan hydrolysis and autolysins occurs during growth and cell division. Since peptidoglycan hydrolases are important for virulence, envelope integrity, and regulation of cell division, it is valuable to investigate their function and regulation. Notably, PcsB-like proteins such...

    Jhonatan A. Hernandez-Valdes, Chenxi Huang, Jan Kok, Oscar P. Kuipers
  • Nisin M: a Bioengineered Nisin A Variant That Retains Full Induction Capacity but Has Significantly Reduced Antimicrobial Activity
    Biotechnology | Spotlight
    Nisin M: a Bioengineered Nisin A Variant That Retains Full Induction Capacity but Has Significantly Reduced Antimicrobial Activity

    This study describes the generation of a nisin variant with superior characteristics for use in the NICE protein expression system. The variant, termed nisin M, retains an induction capacity comparable to that of wild-type nisin A but exhibits significantly reduced antimicrobial activity and can therefore be used at concentrations that are normally toxic to the expression host.

    Michelle O’ Connor, Des Field, Aoife Grainger, Paula M. O’ Connor, Lorraine Draper, R. Paul Ross, Colin Hill
  • <span class="sc">d</span>-Methionine and <span class="sc">d</span>-Phenylalanine Improve <span class="named-content genus-species" id="named-content-1">Lactococcus lactis</span> F44 Acid Resistance and Nisin Yield by Governing Cell Wall Remodeling
    Genetics and Molecular Biology
    d-Methionine and d-Phenylalanine Improve Lactococcus lactis F44 Acid Resistance and Nisin Yield by Governing Cell Wall Remodeling

    As d-amino acids play an important role in cell wall synthesis, we analyzed the effects of 19 different d-amino acids on L. lactis F44, demonstrating that d-Met and d-Phe can participate in peptidoglycan (PG) synthesis and improve the acid resistance and nisin yield of this...

    Hao Wu, Ershu Xue, Ning Zhi, Qianqian Song, Kairen Tian, Qinggele Caiyin, Lin Yuan, Jianjun Qiao
  • Open Access
    Lysis of a <span class="named-content genus-species" id="named-content-1">Lactococcus lactis</span> Dipeptidase Mutant and Rescue by Mutation in the Pleiotropic Regulator CodY
    Genetics and Molecular Biology
    Lysis of a Lactococcus lactis Dipeptidase Mutant and Rescue by Mutation in the Pleiotropic Regulator CodY

    Precise control of peptidoglycan synthesis is essential in Gram-positive bacteria for maintaining cell shape and integrity as well as resisting stresses. Although neither the dipeptidase PepV nor alanine is essential for L. lactis MG1363, adequate availability of either ensures proper cell wall synthesis. We broaden the knowledge about the dipeptidase PepV, which acts...

    Chenxi Huang, Jhonatan A. Hernandez-Valdes, Oscar P. Kuipers, Jan Kok
  • A Specific Sugar Moiety in the <span class="named-content genus-species" id="named-content-1">Lactococcus lactis</span> Cell Wall Pellicle Is Required for Infection by CHPC971, a Member of the Rare 1706 Phage Species
    Genetics and Molecular Biology
    A Specific Sugar Moiety in the Lactococcus lactis Cell Wall Pellicle Is Required for Infection by CHPC971, a Member of the Rare 1706 Phage Species

    Gathering information on how lactococcal bacteriophages recognize their host and proliferate in the dairy environment is of vital importance for the establishment of proper starter culture rotation plans and to avoid fermentation failure and consequent great economic losses for dairy industries. We provide strong evidence on the type of receptor recognized by a newly isolated 1706-type lactococcal bacteriophage, increasing knowledge of...

    Barbara Marcelli, Anne de Jong, Harma Karsens, Thomas Janzen, Jan Kok, Oscar P. Kuipers
  • LanI-Mediated Lantibiotic Immunity in <span class="named-content genus-species" id="named-content-1">Bacillus subtilis</span>: Functional Analysis
    Environmental Microbiology | Spotlight
    LanI-Mediated Lantibiotic Immunity in Bacillus subtilis: Functional Analysis

    The two lantibiotics nisin and subtilin are produced by Lactococcus lactis and Bacillus subtilis, respectively. Both peptides have strong antimicrobial activity against Gram-positive bacteria, and therefore, appropriate protection mechanisms are required for the producing strains. To prevent...

    Christoph Geiger, Sophie Marianne Korn, Michael Häsler, Oliver Peetz, Janosch Martin, Peter Kötter, Nina Morgner, Karl-Dieter Entian
  • Food Microbiology | Spotlight
    Task Distribution between Acetate and Acetoin Pathways To Prolong Growth in Lactococcus lactis under Respiration Conditions

    Lactococcus lactis is used in food and biotechnology industries for its capacity to produce lactic acid, aroma, and proteins. This species grows by fermentation or by an aerobic respiration metabolism when heme is added. Whereas fermentation leads mostly to lactic acid production, respiration produces acetate and acetoin. Respiration growth leads to greatly improved...

    Bénédicte Cesselin, Christel Garrigues, Martin B. Pedersen, Célia Roussel, Alexandra Gruss, Philippe Gaudu
  • Genetics and Molecular Biology
    Versatile Cas9-Driven Subpopulation Selection Toolbox for Lactococcus lactis
    Simon van der Els, Jennelle K. James, Michiel Kleerebezem, Peter A. Bron

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