期刊
FRONTIERS IN PHYSIOLOGY
卷 12, 期 -, 页码 -出版社
FRONTIERS MEDIA SA
DOI: 10.3389/fphys.2021.678080
关键词
beta-lactoglobulin; glycodelin; PAEP; biological function; lipocalin
类别
The two lipocalins, beta-lactoglobulin and glycodelin, are closely related members of the lipocalin family, but they have substantially different functions. While glycodelin has well defined biological functions, the function of beta-lactoglobulin remains elusive. Glycodelin is associated with reproduction while beta-lactoglobulin's function is unclear.
The two lipocalins, beta-lactoglobulin (beta Lg) and glycodelin (Gd), are possibly the most closely related members of the large and widely distributed lipocalin family, yet their functions appear to be substantially different. Indeed, the function of beta-lactoglobulin, a major component of ruminant milk, is still unclear although neonatal nutrition is clearly important. On the other hand, glycodelin has several specific functions in reproduction conferred through distinct, tissue specific glycosylation of the polypeptide backbone. It is also associated with some cancer outcomes. The glycodelin gene, PAEP, reflecting one of its names, progestagen-associated endometrial protein, is expressed in many though not all primates, but the name has now also been adopted for the beta-lactoglobulin gene (HGNC, www.genenames.org). After a general overview of the two proteins in the context of the lipocalin family, this review considers the properties of each in the light of their physiological functional significance, supplementing earlier reviews to include studies from the past decade. While the biological function of glycodelin is reasonably well defined, that of beta-lactoglobulin remains elusive.
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