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"FecR-family proteins are **membrane-anchored transducers** that couple **TonB-dependent outer-membrane receptors**"
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"For C5B1I2 (FecR-like), the primary function is not catalysis or transport."
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"C5B1I2 is best interpreted as the **inner-membrane signaling/anti-σ component** of a CSS pathway, not as an enzyme or transporter"
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"C5B1I2 likely functions by **controlling an ECF σ factor in the cytoplasm**, rather than binding DNA directly"
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"A major characteristic of FecR-like proteins is **regulated intramembrane proteolysis (RIP)**"
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"This topology strongly supports that C5B1I2 functions at the **cytoplasmic membrane**"
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"The symbol **mluR** is **ambiguous/insufficiently grounded** in retrieved literature"
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"retrieved sources did **not** directly connect these methylotroph studies to a named **FecR/FecI-like iron CSS module**"
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"all pathway assignments to AM1 are **inferred** from family/domain evidence and general CSS biology"