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epsin
Epsins are a family of highly conserved membrane proteins that are important in creating membrane curvature. Epsins contribute to membrane deformations like endocytosis, and block vesicle formation during mitosis.
== Structure ==
Epsin contains various protein domains that aid in function. Starting at the N-terminus is the ENTH domain. ENTH stands for Epsin N-Terminal Homolog. The ENTH domain is approximately 150 amino acids long and is highly conserved across species.〔 It is composed of seven α-helices and an eighth helix that is not aligned with the seven helices that make up a superhelical fold.〔 The role of the ENTH domain is to bind membrane lipids which is currently thought to aid in the invagination of the plasma membrane to form clathrin-coated vesicles. Additionally, located toward the C-terminus of the ENTH domain are two to three ubiquitin interacting motifs which aids in ubiquitin dependent recruitment.〔
Following the ENTH domain there is not as much conservation in structure across species. However, in higher eukaryotes there are several conserved motifs such as the clathrin-binding motifs which bind clathrin heavy chain, these motifs flank a cluster of up to eight DP repeats which bind to AP2.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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