Integral monotopic protein

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 membrane from one side.

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

There are also structures of integral monotopic domains of transmembrane proteins:

References

Proteins

Processes	Protein biosynthesis Post-translational modification Protein folding Protein targeting Proteome Protein methods

Structures	Protein structure Protein structural domains Proteasome

Types	List of types of proteins List of proteins Membrane protein Globular protein Globulin Albumin Fibrous protein

Protein: cell membrane proteins (other than Cell surface receptor, enzymes, and cytoskeleton)

Arrestin	SAG ARRB1 ARRB2 ARR3

Membrane-spanning 4A	MS4A1 MS4A2 MS4A3 MS4A4A MS4A4E MS4A5 MS4A6A MS4A6E MS4A7 MS4A8B MS4A9 MS4A10 MS4A12 MS4A13 MS4A14 MS4A15 MS4A18

Myelin	Myelin basic protein PMP2 Myelin proteolipid protein PLP1 Myelin oligodendrocyte glycoprotein Myelin-associated glycoprotein Myelin protein zero

Pulmonary surfactant	Pulmonary surfactant-associated protein B Pulmonary surfactant-associated protein C

Tetraspanin	TSPAN1 TSPAN2 TSPAN3 TSPAN4 TSPAN5 TSPAN6 TSPAN7 TSPAN8 TSPAN9 TSPAN10 TSPAN11 TSPAN12 TSPAN13 TSPAN14 TSPAN15 TSPAN16 TSPAN17 TSPAN18 TSPAN19 TSPAN20 TSPAN21 TSPAN22 TSPAN23 TSPAN24 TSPAN25 TSPAN26 TSPAN27 TSPAN28 TSPAN29 TSPAN30 TSPAN31 TSPAN32 TSPAN33 TSPAN34

Other/ungrouped	Calnexin LDL-receptor-related protein-associated protein Neurofibromin 2 Presenilin PSEN1 PSEN2 HFE Phospholipid transfer proteins Dysferlin STRC OTOF

see also other cell membrane protein disorders

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