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Publication : Myelin proteolipid protein (PLP), but not DM-20, is an inositol hexakisphosphate-binding protein.

First Author  Yamaguchi Y Year  1996
Journal  J Biol Chem Volume  271
Issue  44 Pages  27838-46
PubMed ID  8910382 Mgi Jnum  J:36915
Mgi Id  MGI:84330 Doi  10.1074/jbc.271.44.27838
Citation  Yamaguchi Y, et al. (1996) Myelin proteolipid protein (PLP), but not DM-20, is an inositol hexakisphosphate-binding protein. J Biol Chem 271(44):27838-46
abstractText  Myelin proteolipid protein (PLP) and its alternatively spliced isoform, DM-20, are the major integral membrane proteins of central nervous system myelin. It is known that PLP and DM-20 are delivered to myelin by a finely regulated vesicular transport system in oligodendrocytes. Evolutionarily, it is believed that ancestral DM-20 acquired a PLP-specific exon to create PLP, after which PLP/DM-20 became a major component of central nervous system myelin. We purified PLP as an inositol 1,3,4,5-tetrakisphosphate-binding protein after solubilization in a non-organic solvent. However, under the isotonic condition, PLP binds inositol hexakisphosphate (InsP6) significantly, not inositol 1,3,4,5-tetrakisphosphate. Most of the InsP6-binding proteins are involved in vesicular transport, suggesting the involvement of PLP in vesicular transport. We separated DM-20 from PLP by CM-52 chromatography and showed that DM-20 has no InsP6 binding activity. These findings indicate that the PLP-specific domain confers the InsP6 binding activity and this interaction may be important for directing PLP transport to central nervous system myelin.
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