Journal: eLife

Article Title: The angiopoietin-like protein ANGPTL4 catalyzes unfolding of the hydrolase domain in lipoprotein lipase and the endothelial membrane protein GPIHBP1 counteracts this unfolding

doi: 10.7554/eLife.20958

Figure Lengend Snippet: Panel A shows a sequence alignment of the first 55 residues of fully processed human ANGPTL3, ANGPTL4, and ANGPTL8. Identical sequences are highlighted by blue letters. The filled red box highlights the two-residue acidic motif at the start of the N-terminal α-helix, followed by a conserved α-helical region (open box). The two cysteine residues unique to ANGPTL4 are shown in yellow boxes. Panel B shows the time-dependent unfolding of 10 µM LPL by 1 µM ANGPTL3 ( green circles ) as defined by the appearance of bimodality in the isotope envelopes for peptide 131–165. For comparison the unfolding of LPL by 1 µM ANGPTL4 1–159 is shown as solid (wild-type) and hatched (E15K) gray lines. Spontaneous unfolding is shown by black triangles. Panel C shows the residual lipolytic activity of 10 µM LPL incubated for 10 min alone or in the presence of 1 µM ANGPTL3, 1 µM ANGPTL3 and 30 µM GPIHBP1, or 1 µM ANGPTL4 1–159 . DOI: http://dx.doi.org/10.7554/eLife.20958.012

Article Snippet: Full-length ANGPTL3 produced in HEK293 cells was purchased from ProSpec (Ness-Ziona, Israel).

Techniques: Sequencing, Residue, Comparison, Activity Assay, Incubation