Localization of the GerD spore germination protein in the Bacillus subtilis spore.
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GerD localizes to the inner membrane and germ cell wall of spores
"the protein was detected in the inner membrane of spores, but it was also present at a high level in spore integuments (comprising coat, cortex and germ cell wall layers)"
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GerD is required for efficient nutrient receptor-dependent germination
"The GerD protein of Bacillus subtilis is required for efficient spore germination in l-alanine, and for germination in the alternative germinant combination of amino acids plus sugars. Only germination via nutrient receptors is affected in the mutant."
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GerD is a lipoprotein anchored at the membrane
"The GerD protein is predicted to be a lipoprotein that is produced in the forespore compartment of the sporulating cell"
Structural and functional analysis of the GerD spore germination protein of Bacillus species.
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GerD forms a trimeric coiled-coil structure (PDB 4O8W)
"The 121-residue core polypeptide of GerD (GerD⁶⁰⁻¹⁸⁰) from Geobacillus stearothermophilus forms a stable α-helical trimer in aqueous solution"
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GerD clusters GRs into the germinosome
"GerD mediates clustering of germination proteins in the inner membrane of dormant spores and thus promotes the rapid and cooperative germination response to nutrients"
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Mutations disrupting GerD structure severely impair germination
"alterations in the GerD trimer structure have profound effects on nutrient germination. This important structure-function relationship of trimeric GerD is supported by our identification of a dominant negative gerD mutation in B. subtilis"
SpoVAF and FigP assemble into oligomeric ion channels that enhance spore germination.
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SpoVAF/FigP foci depend on GerD for proper localization
"We demonstrate that 5AF and FigP interact, form oligomers in vivo, and colocalize with GerA family receptors in spores"
Deep research summary for gerD
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GerD is a scaffold protein that clusters GRs at the spore inner membrane
"GerD is a membrane-associated lipoprotein anchored at the outer surface of the spore IM and co-localizes with GR subunits in a single discrete focus (germinosome) in dormant spores. GerD-GFP alone forms a single focus, supporting a scaffold role for the organization of GRs in the membrane"
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GerD enables rapid germination signaling
"GerD promotes clustering and proper function of GR complexes (A/B/C subunits) in the IM, thereby enabling rapid initiation of germination in response to nutrient germinants"