Journal of Biosciences

, Volume 13, Issue 1, pp 87–104 | Cite as

Biochemical and immunological aspects of riboflavin carrier protein

  • P. R. Adiga
  • S. S. Visweswariah
  • A. Karande
  • N. Kuzhandhaivelu


Riboflavin carrier protein which is obligatorily involved in yolk deposition of the vitamin in the chicken egg, is a unique glycophosphoprotein present in both the yolk and white compartments. The yolk and egg white proteins are products of a single estrogen-inducible gene expressed in the liver and the oviduct respectively of egg laying birds. Despite the fact that the carbohydrate composition of the yolk and white riboflavin carrier proteins differ presumably due to differential post-translational modification, the proteins are immunologically similar and have identical amino acid sequence (including a cluster of 8 phosphoser residues towards the C-terminus) except at the carboxy terminus where the yolk riboflavin carrier protein lacks 13 amino acids as a consequence of proteolytic cleavage during uptake by oocytes. The protein is highly conserved throughout evolution all the way to humans in terms of gross molecular characteristics such as molecular weight and isoelectric point, and in immunological properties, preferential affinity for free riboflavin and estrogen inducibility at the biosynthetic locusviz., liver. Obligatory involvement of the mammalian riboflavin carrier protein in transplacental flavin transport to subserve fetal vitamin nutrition during gestation is revealed by experiments using pregnant rodent or subhuman primate models wherein immunoneutralisation of endogenous maternal riboflavin carrier protein results in fetal wastage followed by pregnancy termination due to selective yet drastic curtailment of vitamin efflux into the fetoplacental unit. Using monoclonal antibodies to chicken riboflavin carrier protein, it could be shown that all the major epitopes of the avian riboflavin carrier protein are highly conserved throughout evolution although the relative affinities of some of the epitopes for different monoclonal antibodies have undergone progressive changes during evolution. Using these monoclonal antibodies, an attempt is being made to map the different epitopes on the riboflavin carrier protein molecule with a view to delineate the immunodominant regions of the vitamin carrier to understand its structure-immunogenicity relationship.


Riboflavin carrier protein evolutionary conservation transplacental transport immunoneutralisation monoclonal antibodies epitope analysis 

Abbreviations used


Riboflavin carrier protein


molecular weight




sodium dodecyl sulphate


immunoglobulin G


monoclonal antibody


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Copyright information

© Indian Academy of Sciences 1988

Authors and Affiliations

  • P. R. Adiga
    • 1
  • S. S. Visweswariah
    • 1
  • A. Karande
    • 1
  • N. Kuzhandhaivelu
    • 1
  1. 1.Department of BiochemistryIndian Institute of ScienceBangaloreIndia

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