Lactotransferrin

Part of speech: noun

Definitions

1. A multifunctional glycoprotein found in various secretions like milk, saliva, and tears; it binds iron tightly to inhibit bacterial growth and supports immune defense mechanisms
2. An iron-binding protein present in bodily fluids such as milk and mucus; it helps regulate iron absorption, exhibits antimicrobial properties, and participates in immune system modulation
3. A natural protein occurring in secretions including breast milk and saliva; functioning to sequester iron to limit microbial proliferation and contributing to host immune protection through its biochemical activity

Etymology: Lactotransferrin is a compound built from two parts that were joined in the twentieth century. The first, "lacto-", comes from Latin "lac" (genitive "lactis"), meaning milk, which also gives English "lactate" and "lactose". The second, "transferrin", names a family of iron-carrying blood proteins. Its name reflects its job: it binds iron and moves it around the body, and its role in milk is what gave it the "lacto-" prefix. The "transferrin" element was coined in the 1940s, when researchers studying blood serum needed a name for proteins that transported iron, a sense built from "transfer" and the suffix "-in" used for proteins. Milk proteins with the same iron-binding behaviour were identified later, and they were named by analogy, so the word is a deliberately constructed scientific term rather than an older one. Because it was coined from modern parts, no ancient language used it in any sense.

Synonyms: lactoferrin