= Methylorubrum extorquens
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<Methylorubrum extorquens> is a <species> of <bacteria> and the <type species> of <Methylorubrum>. The older combination `Methylobacterium extorquens` names the same species: LPSN records it as a homotypic synonym, meaning that the two names share a nomenclatural type.<Methylorubrum extorquens in LPSN>[Name and homotypic-synonym fields]{ref} Experimental results still need a specified <bacterial strain>; a species name alone does not identify every tested culture.
<Methylorubrum extorquens AM1> is a model for facultative <methylotrophy>. Its studied pathway converts <methanol> to <formaldehyde>, with carbon subsequently divided between oxidation toward <carbon dioxide> and <carbon assimilation> into cellular material.<Methylotrophic metabolism is advantageous for Methylobacterium extorquens during colonization of Medicago truncatula under competitive conditions by Abdoulaye Sy and others>[Figure 1, one-carbon metabolism]{ref}
A 2005 experiment compared AM1-derived <mutants> with a reference strain during colonization of <Medicago truncatula>. <Mutants> defective in <methylotrophy> lost ground in competition, yet could reach comparable populations when tested separately. This distinction supports a competitive advantage from <methanol> use without making it the only usable carbon source.<Methylotrophic metabolism is advantageous for Methylobacterium extorquens during colonization of Medicago truncatula under competitive conditions by Abdoulaye Sy and others>[Abstract and Figures 2–3, competitive versus single-inoculation comparisons]{ref} In an illustrative count, a population share changing from $1/2$ to $1/4$ halves the strain's share; it does not show that its absolute number of <cells> halved. Both the fraction and the total count are needed to distinguish relative success from population decline.
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