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    1. Computational and Systems Biology
    2. Evolutionary Biology

    Adaptation to mutational inactivation of an essential gene converges to an accessible suboptimal fitness peak

    João V Rodrigues, Eugene I Shakhnovich
    When an essential metabolic gene in E. coli is mutationally inactivated, subsequent evolution rarely reverts the mutation to wild type but rather follows unexpected paths that rewire metabolic fluxes.
    1. Evolutionary Biology

    Gene family innovation, conservation and loss on the animal stem lineage

    Daniel J Richter et al.
    The genomes of animal progenitors evolved as mosaics of old, new, rearranged, and repurposed protein domains, genes and pathways and paved the way for the origin and evolution of animals.
    1. Microbiology and Infectious Disease

    A serine sensor for multicellularity in a bacterium

    Arvind R Subramaniam et al.
    Biofilm formation by Bacillus subtilis relies on a sensing mechanism for the amino acid serine that does not depend on a dedicated protein or RNA.
    1. Cell Biology
    2. Computational and Systems Biology

    Self-establishing communities enable cooperative metabolite exchange in a eukaryote

    Kate Campbell et al.
    A eukaryotic cell model overcomes metabolic deficiencies within a complex, self-establishing community that enables the growth-relevant exchange of metabolic intermediates.
    1. Microbiology and Infectious Disease
    2. Plant Biology

    A secreted Ustilago maydis effector promotes virulence by targeting anthocyanin biosynthesis in maize

    Shigeyuki Tanaka et al.
    A fungal effector secreted by the corn smut pathogen increases the virulence of the pathogen by elevating anthocyanin production and reducing lignification in maize.
    1. Genetics and Genomics

    Downregulation of the tyrosine degradation pathway extends Drosophila lifespan

    Andrey A Parkhitko et al.
    The tyrosine degradation pathway reprogramming connects mitochondrial dysfunction, aging, and production of tyrosine-derived neuromediators that can be targeted with an FDA-approved drug, Tigecycline.
    1. Genetics and Genomics
    2. Microbiology and Infectious Disease

    Highly regulated, diversifying NTP-dependent biological conflict systems with implications for the emergence of multicellularity

    Gurmeet Kaur et al.
    Multicellular and socially aggregating prokaryotes contain previously undescribed, chaperone-based systems predicted to mediate defensive biological conflicts, several components of which are thematically similar antecedents of eukaryotic apoptosis pathways.
    1. Neuroscience

    A high affinity RIM-binding protein/Aplip1 interaction prevents the formation of ectopic axonal active zones

    Matthias Siebert et al.
    High affinity interactions with transport adaptors are important to shield the interaction surfaces of cytomatrix components to block fatal premature oligomerization of active zone proteins during axonal transport.
    1. Biochemistry and Chemical Biology
    2. Microbiology and Infectious Disease

    Oxidation of cellular amino acid pools leads to cytotoxic mistranslation of the genetic code

    Tammy J Bullwinkle et al.
    Translation quality control protects the cell from environmental stresses that could potentially lead to the toxic accumulation of non-proteinogenic amino acids in the proteome.
    1. Cell Biology
    2. Chromosomes and Gene Expression

    Modularity and determinants of a (bi-)polarization control system from free-living and obligate intracellular bacteria

    Matthieu Bergé et al.
    Common ancestries, activities and structural determinants of a modular (bi-)polarization control system encoded in free-living and obligate intracellular α-proteobacteria, including the rickettsial pathogens, are described.