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. Author manuscript; available in PMC: 2013 Jan 1.
Published in final edited form as: Biochim Biophys Acta. 2011 Jun 12;1821(1):70–77. doi: 10.1016/j.bbalip.2011.06.002

Table 1.

Proteins involved in the digestion, absorption and transport of dietary vitamin A.

  • 1

    Carotenoid cleavage

    β-Carotene oxygenases (BCO1 and BCO2)

  • 2

    Carotenoid uptake and transfer

    Carotenoid transporters (SRB1, others?)

    Carotenoid-binding proteins?

  • 2
    Retinyl ester hydrolysis
    1. Lumen
      Pancreatic triglyceride lipase
      Pancreatic lipase-related protein 2
    2. Brush border membrane
      Phospholipase B
  • 2

    Retinol uptake, transfer, and efflux

    Retinol transporters (ABCA1, others?)

    Cellular retinol binding protein I (?)

    Cellular retinol binding protein II

  • 3

    Retinyl ester synthesis

    Lecithin:retinol acyltransferase

    Diacylglycerol acyltransferase 1

  • 4

    Chylomicron assembly

    Apolipoprotein B

    Microsomal triglyceride transfer protein