The Macoilin proteins has an N-terminal portion that is composed of 5 trasnmembrane helices, followed by a C-terminal coiled-coil region. Macoilin is a highly conserved protein present in eukaryotes. Macoilin appears to be found in the ER and be involved in the function of neurons [2-3].

1: An improved method for the analysis of membrane proteins by mass spectrometry. Mirza SP, Halligan BD, Greene AS, Olivier M; Physiol Genomics. 2007; [Epub ahead of print] PMID:17341690

2: Novel and conserved protein macoilin is required for diverse neuronal functions in Caenorhabditis elegans. Miyara A, Ohta A, Okochi Y, Tsukada Y, Kuhara A, Mori I; PLoS Genet. 2011;7:e1001384. PMID:21589894

3: Macoilin, a conserved nervous system-specific ER membrane protein that regulates neuronal excitability. Arellano-Carbajal F, Briseno-Roa L, Couto A, Cheung BH, Labouesse M, de Bono M; PLoS Genet. 2011;7:e1001341. PMID:21437263