Biology:Integral monotopic protein
From HandWiki
Schematic representation of the different types of interaction between monotopic membrane proteins and the cell membrane: 1. interaction by an amphipathic α-helix parallel to the membrane plane (in-plane membrane helix) 2. interaction by a hydrophobic loop 3. interaction by a covalently bound membrane lipid (lipidation) 4. electrostatic or ionic interactions with membrane lipids (e.g. through a calcium ion)
Integral monotopic proteins are permanently attached to the cell membrane from one side, and are a type of integral membrane protein (IMP).[1]
Three-dimensional structures of the following integral monotopic proteins have been determined:
- prostaglandin H2 syntheses 1 and 2 (cyclooxygenases)
- lanosterol synthase and squalene-hopene cyclase
- microsomal prostaglandin E synthase
- carnitine O-palmitoyltransferase 2
- Phosphoglycosyl transferase C
There are also structures of integral monotopic domains of transmembrane proteins:
- monoamine oxidases A and B
- fatty acid amide hydrolase
- mammalian cytochrome P450 oxidases
- corticosteroid 11-beta-dehydrogenases
References
- ↑ Fowler, Philip W.; Coveney, Peter V. (July 2006). "A Computational Protocol for the Integration of the Monotopic Protein Prostaglandin H2 Synthase into a Phospholipid Bilayer". Biophysical Journal 91 (2): 401–410. doi:10.1529/biophysj.105.077784. PMID 16632499.
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