What is "homotetramer"

n. (context chemistry biochemistry English) A tetramer, especially a biologically active one, derived from four identical monomers

A homotetramer is a protein complex made up of four identical subunits which are associated but not covalently bound. A heterotetramer is a 4-subunit complex where one or more subunits differ.

Examples of homotetramers include:

• enzymes like beta-glucuronidase (pictured)
• export factors such as SecB from Escherichia coli
• magnesium ion transporters such as CorA.
• lectins such as Concanavalin A