Comparative study on the structure and properties of egg white proteins from ostrich and chicken

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The ostrich proteins orthologous to chicken ovalbumin and ovomucoid were purified and immunologically identified. The estimated molecular weight of ostrich ovalbumin was 30 kD higher than that of chicken ortholog. Only limited similarities were found between the amino acid sequences of ostrich and chicken ovalbumins. The estimated molecular weight of ostrich ovomucoid was similar to that of chicken ortholog but much more heterogeneous in size. The sequence similarity in amino acids was suggested to be more than 60% between chicken and ostrich ovomucoids. The digestibility of the proteins was also compared.