During the last decade, marked progress has been made in the study of
the fine details of the structures of milk proteins such as caseins, b
eta-lactoglobulin, alpha-lactalbumin, and lactotransferrin. Many of th
e functional properties of the individual milk proteins, as well as th
e milk protein products, may be described at the molecular level. This
article is an attempt to thoroughly review the three-dimensional stru
ctures of major milk proteins, and to correlate them with the function
al aspects of these proteins as food ingredients.