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    1. Genetics and Genomics

    Multiplexed measurement of variant abundance and activity reveals VKOR topology, active site and human variant impact

    Melissa A Chiasson et al.
    Human vitamin K epoxide reductase (VKOR) has a four transmembrane domain topology that supports the use of a homology model, enabling identification of active site residues and human variant impact.
    1. Neuroscience

    The β-alanine transporter BalaT is required for visual neurotransmission in Drosophila

    Yongchao Han et al.
    BalaT-dependent β-alanine trafficking pathway in retinal pigment cells is critical for maintaining synaptic transmission of photoreceptor neurons in Drosophila.
    1. Microbiology and Infectious Disease

    Human gut Bacteroides capture vitamin B12 via cell surface-exposed lipoproteins

    Aaron G Wexler et al.
    The human gut bacterial lipoprotein BtuG binds vitamin B12 with femtomolar affinity, can remove vitamin B12 from human intrinsic factor, and is required for commensal fitness in the gut.
    1. Microbiology and Infectious Disease
    2. Structural Biology and Molecular Biophysics

    Structural intermediates observed only in intact Escherichia coli indicate a mechanism for TonB-dependent transport

    Thushani D Nilaweera et al.
    Pulse electron paramagnetic resonance on intact Escherichia coli reveals a substrate-induced structural transition in BtuB, the vitamin B12 transporter, which is not seen in reconstituted membranes and indicates a mechanism of transport.
    1. Biochemistry and Chemical Biology
    2. Evolutionary Biology

    Non-classical amine recognition evolved in a large clade of olfactory receptors

    Qian Li et al.
    Fish trace amine-associated receptors evolved a novel structural motif that enables the detection of chemically diverse amine odors in a non-canonical 'inverted' orientation.
    1. Biochemistry and Chemical Biology
    2. Structural Biology and Molecular Biophysics

    Functional and structural characterization of an ECF-type ABC transporter for vitamin B12

    Joana A Santos et al.
    ECF-CbrT is a bacterial vitamin B12 transporter that is structurally different from the well-characterized transporter BtuCDF, yet has similar functional properties.
    1. Evolutionary Biology
    2. Plant Biology

    Evolution of alternative biosynthetic pathways for vitamin C following plastid acquisition in photosynthetic eukaryotes

    Glen Wheeler et al.
    Genomic evidence suggests that L-gulonolactone oxidase-the terminal enzyme in vitamin C synthesis, which has been repeatedly lost throughout animal evolution-was lost in plants and other photosynthetic eukaryotes following plastid acquisition.
    1. Neuroscience

    Cellular and neurochemical basis of sleep stages in the thalamocortical network

    Giri P Krishnan et al.
    A computational model of the thalamocortical network explains sleep stages by the coordinated variations in the level of neuromodulators and predicts differences of sleep pattern in human, cat and mouse recordings.
    1. Chromosomes and Gene Expression
    2. Computational and Systems Biology

    Caenorhabditis elegans methionine/S-adenosylmethionine cycle activity is sensed and adjusted by a nuclear hormone receptor

    Gabrielle E Giese et al.
    Metabolic activity of the methionine/S-adenosylmethionine cycle is sensed and transcriptionally regulated by a nuclear hormone receptor in Caenorhabditis elegans in order to maintain metabolic homeostasis in a tightly controlled regime.
    1. Cell Biology
    2. Developmental Biology

    Canonical NF-κB signaling maintains corneal epithelial integrity and prevents corneal aging via retinoic acid

    Qian Yu et al.
    Corneal aging is regulated by the NF-κB-retinoic acid pathway and can be delayed by retinoic acid administration.