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Articles by Birgit E. Scharf
Author Correction: An extensive disulfide bond network prevents tail contraction in Agrobacterium tumefaciens phage Milano - Nature Communications
Correction to: Nature Communications https://doi.org/10.1038/s41467-024-44959-z, published online 26 January 2024 The original version of the Supplementary Information associated with this Article contained an error in Figure S5. The distance values of the contracted and extended phage tail power spectrum have been incorrectly labeled.
The dual role of a novel Sinorhizobium meliloti chemotaxis protein CheT in signal termination and adaptation
1 INTRODUCTION Motile bacteria have evolved diverse mechanisms for movement in the environment. They can swim to flee harm, reach an infection site, and facilitate host interactions (Erhardt, 2016). This motility behavior is carried out by efficient intracellular motors, which power intricately assembled structures like flagella and are controlled by a set of core and auxiliary chemosensory proteins.
Chemoreceptors in Sinorhizobium meliloti require minimal pentapeptide tethers to provide adaptational assistance
1 INTRODUCTION The well-studied Escherichia coli chemotaxis pathway consists of signal sensing, intracellular signal transduction, and sensory adaptation (Colin & Sourjik, 2017; Sourjik & Wingreen, 2012).
Vibrio cholerae Bacteremia: An Enigma in Cholera-Endemic African Countries
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An extensive disulfide bond network prevents tail contraction in Agrobacterium tumefaciens phage Milano - Nature Communications
Abstract A contractile sheath and rigid tube assembly is a widespread apparatus used by bacteriophages, tailocins, and the bacterial type VI secretion system to penetrate cell membranes. In this mechanism, contraction of an external sheath powers the motion of an inner tube through the membrane. The structure, energetics, and mechanism of the machinery imply rigidity and straightness.
Neck and capsid architecture of the robust Agrobacterium phage Milano - Communications Biology
Abstract Large gaps exist in our understanding of how bacteriophages, the most abundant biological entities on Earth, assemble and function. The structure of the “neck” region, where the DNA-filled capsid is connected to the host-recognizing tail remains poorly understood. We describe cryo-EM structures of the neck, the neck-capsid and neck-tail junctions, and capsid of the Agrobacterium phage Milano.
Sinorhizobium meliloti Chemoreceptor McpV Senses Short-Chain Carboxylates via Direct Binding
ABSTRACT Sinorhizobium meliloti is a soil-dwelling endosymbiont of alfalfa that has eight chemoreceptors to sense environmental stimuli during its free-living state. The functions of two receptors have been characterized, with McpU and McpX serving as general amino acid and quaternary ammonium compound sensors, respectively. Both receptors use a dual Cache (calcium channels and chemotaxis receptors) domain for ligand binding.
Sinorhizobium meliloti chemoreceptor McpV senses short chain carboxylates via direct binding
ABSTRACTSinorhizobium meliloti is a soil-dwelling endosymbiont of alfalfa with eight chemoreceptors to sense environmental stimuli during its free-living state. The functions of two receptors have been characterized, with McpU and McpX serving as general amino acid and quaternary ammonium compound sensors, respectively. Both receptors use a dual Cache domain for ligand binding. We identified that the ligand-binding, periplasmic region (PR) of McpV contains a single Cache domain.
More than Rotating Flagella: Lipopolysaccharide as a Secondary Receptor for Flagellotropic Phage 7-7-1
ABSTRACTBacteriophage 7-7-1, a member of the family Myoviridae, infects the soil bacterium Agrobacterium sp. strain H13-3. Infection requires attachment to actively rotating bacterial flagellar filaments, with flagellar number, length, and rotation speed being important determinants for infection efficiency. To identify the secondary receptor(s) on the cell surface, we isolated motile, phage-resistant Agrobacterium sp. H13-3 transposon mutants.
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