Assessment of the potential allergenicity of a Milk Basic Protein fraction

Richard E. Goodman, Steve L. Taylor, Junichi Yamamura, Toshiya Kobayashi, Hiroshi Kawakami, Claire L. Kruger, Gavin P. Thompson

Research output: Contribution to journalArticle

18 Scopus citations

Abstract

Background: A specific basic fraction of bovine milk, termed Milk Basic Protein (MBP), has the potential to provide nutritionally important benefits if used as a food ingredient. Although derived from milk, MBP is intended for use as an ingredient in other foods. Cows' milk is a well studied, commonly allergenic food. Although the proteins in MBP are not identified as milk allergens, food products containing MBP will be labelled as containing milk as a caution to milk allergic consumers under food labelling guidelines in the US and the European Union as MBP has not been demonstrated to be free of milk allergens. However, as part of an overall safety evaluation of MBP, the developers sought to evaluate the potential allergenicity of the primary protein components for characteristics of allergenic food proteins and to assess whether intake of these proteins at intended use levels could present a significant new allergenic risk for consumers. Objective: To evaluate the potential allergenicity of the five identified proteins in MBP. While extensive studies have not demonstrated allergenicity of lactoferrin, the four other proteins are less studied. The four were tested here by sequence identity comparison to known allergens, and for stability of these proteins in acidic pepsin as a characteristic common to many food allergens. Methods: Sequences of the proteins were compared to those listed in AllergenOnline.com, by methods recommended for the evaluation of proteins introduced in crops through genetic engineering. Pepsin stability was assessed by incubating the various proteins in simulated gastric fluid at pH 1.2 with porcine pepsin for up to 60 min at 37 °C, with samples withdrawn and analyzed at specific times. Results: No significant sequence similarities were identified for the MBP proteins compared to known allergens. All but one of the protein components of MBP were digested relatively quickly by pepsin. The more stable protein will be of low abundance as consumed in contrast to most pepsin-stable food allergens. Conclusions: Based on molecular characteristics and expected exposure, the protein components in MBP are unlikely to present any increased risk of allergy for milk allergic subjects or of cross-reactivity for other allergic subjects. However, since the proteins are derived from milk, products containing MBP will need to be labelled as containing milk proteins to warn milk allergic subjects of the potential risk of allergic reactions.

Original languageEnglish (US)
Pages (from-to)1787-1794
Number of pages8
JournalFood and Chemical Toxicology
Volume45
Issue number10
DOIs
StatePublished - Oct 2007

Keywords

  • Allergen
  • Bovine
  • Cystatin
  • High mobility group protein
  • Kininogen
  • Lactoperoxidase
  • Milk

ASJC Scopus subject areas

  • Food Science
  • Toxicology

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