Identification and characterization of the ER/lipid droplet-targeting sequence in 17beta-hydroxysteroid dehydrogenase type 11.
17beta-Hydroxysteroid dehydrogenase type 11 (17betaHSD11) is mostly localized on the endoplasmic reticulum (ER) membrane under normal conditions and redistributes to lipid droplets (LDs) when the formation of LDs is induced. In this study, confocal microscopy analyses of the subcellular localization of the mutated 17betaHSD11 proteins in cells with or without LDs revealed that both an N-terminal hydrophobic sequence and an adjacent sequence that has a weak homology with the PAT motif are independently necessary and both parts together (28 amino acid residues in total) are sufficient for the dual localization of 17betaHSD11. Mutation analyses suggest that the PAT-like motif in 17betaHSD11 will not be functionally similar to the canonical PAT motif. Hsp60 was identified as a possibly interacting protein with the PAT-like motif, and biochemical and microscopic analyses suggest that Hsp60 may be partly, but not necessarily involved in recognition of the PAT-like part of the targeting sequence of 17betaHSD11.
Horiguchi
Yuka
Y
Department of Biochemistry, Meiji Pharmaceutical University, 2-522-1 Noshio, Kiyose, Tokyo 204-8588, Japan.
Araki
Makoto
M
Motojima
Kiyoto
K
D015067:17-Hydroxysteroid Dehydrogenases / Q000235:genetics / Q000378:metabolism*; D020816:Amino Acid Motifs / Q000502:physiology; D000818:Animals; D016466:CHO Cells; D018834:Chaperonin 60 / Q000235:genetics / Q000378:metabolism; D006224:Cricetinae; D003412:Cricetulus; D004721:Endoplasmic Reticulum / Q000201:enzymology* / Q000235:genetics; D006801:Humans; D057927:Hydrophobic and Hydrophilic Interactions; D018613:Microscopy, Confocal; D009154:Mutation; D021382:Protein Sorting Signals / Q000502:physiology*; D021381:Protein Transport / Q000502:physiology
D018834:Chaperonin 60; D021382:Protein Sorting Signals; D015067:17-Hydroxysteroid Dehydrogenases