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The annotation and conditions in this rule are derived from the following entries: P0A901 (BLC_ECOLI)

If a protein meets these conditions... i

Common conditions

    • Matches PIR Superfamily signature PIRSF036893
    • sequence length = 134 - 233
    • fragment ≠ the sequence is fragmented

Special conditions

... then these annotations are applied i

Protein namesi

  • Recommended name:
    Retinol-binding protein
  • Recommended name:
    Outer membrane lipoprotein Blc
  • Recommended name:
    Apolipoprotein D
    Short name:

Subcellular locationi

Sequence similaritiesi


  • Retinol-binding protein that mediates retinol transport in blood plasma.
  • Involved in the storage or transport of lipids necessary for membrane maintenance under stressful conditions. Displays a binding preference for lysophospholipids.

Subunit structurei

  • Interacts with TTR.
  • Homodimer.
  • Homodimer.


  • @CHAIN_NAME@i (to residues corresponding to positions @TO|+1@i - @CTER@i)

Signal peptidei

  • (to residues corresponding to positions @NTER@i - @TO@i)


GO (Gene Ontology) termsi

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Main funding by: National Institutes of Health

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