"C5B1I1 most likely functions as an"

"Thus C5B1I1 should be localized to the"

"canonical TBDT transport delivers substrate to the"

"in methylotrophs, TBDTs frequently function in **metal acquisition** by importing **chelated metal complexes** to the periplasm"

"there is no locus-specific genetic/biochemical evidence in the retrieved corpus identifying the precise ligand for UniProt C5B1I1 in AM1"

"the substrate should be reported as"

"the label **mluA** is not corroborated in the retrieved AM1 primary literature for this accession"

"do not equate it to AM1 LutH or other characterized receptors without locus-specific evidence"

"Source [21], [28] describes META1p4129 as mluA (methylolanthanin uptake A), which encodes a TonB-dependent receptor"

"showing a 32-fold increase in expression when"

"transport lanthanide-metallophore complexes from the extracellular environment across the outer membrane barrier into the periplasmic space"

"The protein contains an N-terminal signaling domain that interacts with the anti-sigma factor MluR, encoded by the adjacent *mluR* gene within the same operon"

"the protein is an integral outer membrane protein with the characteristic 22-stranded β-barrel structure typical of this protein family"

"specific recognition and binding of methylolanthanin (MLL) complexed with lanthanide cations"