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TitleThe structure of helical lipoprotein lipase reveals an unexpected twist in lipase storage.
Journal, issue, pagesProc Natl Acad Sci U S A, Vol. 117, Issue 19, Page 10254-10264, Year 2020
Publish dateMay 12, 2020
AuthorsKathryn H Gunn / Benjamin S Roberts / Fengbin Wang / Joshua D Strauss / Mario J Borgnia / Edward H Egelman / Saskia B Neher /
PubMed AbstractLipases are enzymes necessary for the proper distribution and utilization of lipids in the human body. Lipoprotein lipase (LPL) is active in capillaries, where it plays a crucial role in preventing ...Lipases are enzymes necessary for the proper distribution and utilization of lipids in the human body. Lipoprotein lipase (LPL) is active in capillaries, where it plays a crucial role in preventing dyslipidemia by hydrolyzing triglycerides from packaged lipoproteins. Thirty years ago, the existence of a condensed and inactive LPL oligomer was proposed. Although recent work has shed light on the structure of the LPL monomer, the inactive oligomer remained opaque. Here we present a cryo-EM reconstruction of a helical LPL oligomer at 3.8-Å resolution. Helix formation is concentration-dependent, and helices are composed of inactive dihedral LPL dimers. Heparin binding stabilizes LPL helices, and the presence of substrate triggers helix disassembly. Superresolution fluorescent microscopy of endogenous LPL revealed that LPL adopts a filament-like distribution in vesicles. Mutation of one of the helical LPL interaction interfaces causes loss of the filament-like distribution. Taken together, this suggests that LPL is condensed into its inactive helical form for storage in intracellular vesicles.
External linksProc Natl Acad Sci U S A / PubMed:32332168 / PubMed Central
MethodsEM (helical sym.)
Resolution3.8 Å
Structure data

20673

6u7m

EMDB-20673, PDB-6u7m:
Cryo-EM Structure of Helical Lipoprotein Lipase
Method: EM (helical sym.) / Resolution: 3.8 Å

Source
  • bos taurus (cattle)
  • Bovine (cattle)
KeywordsPROTEIN FIBRIL / HYDROLASE / helical symmetry / lipoprotein lipase

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