National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
R01 GM118396
米国
National Institutes of Health/National Cancer Institute (NIH/NCI)
CA197855
米国
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
R01 GM047414
米国
引用
ジャーナル: J Cell Biol / 年: 2017 タイトル: The glycolytic enzyme phosphofructokinase-1 assembles into filaments. 著者: Bradley A Webb / Anne M Dosey / Torsten Wittmann / Justin M Kollman / Diane L Barber / 要旨: Despite abundant knowledge of the regulation and biochemistry of glycolytic enzymes, we have limited understanding on how they are spatially organized in the cell. Emerging evidence indicates that ...Despite abundant knowledge of the regulation and biochemistry of glycolytic enzymes, we have limited understanding on how they are spatially organized in the cell. Emerging evidence indicates that nonglycolytic metabolic enzymes regulating diverse pathways can assemble into polymers. We now show tetramer- and substrate-dependent filament assembly by phosphofructokinase-1 (PFK1), which is considered the "gatekeeper" of glycolysis because it catalyzes the step committing glucose to breakdown. Recombinant liver PFK1 (PFKL) isoform, but not platelet PFK1 (PFKP) or muscle PFK1 (PFKM) isoforms, assembles into filaments. Negative-stain electron micrographs reveal that filaments are apolar and made of stacked tetramers oriented with exposed catalytic sites positioned along the edge of the polymer. Electron micrographs and biochemical data with a PFKL/PFKP chimera indicate that the PFKL regulatory domain mediates filament assembly. Quantified live-cell imaging shows dynamic properties of localized PFKL puncta that are enriched at the plasma membrane. These findings reveal a new behavior of a key glycolytic enzyme with insights on spatial organization and isoform-specific glucose metabolism in cells.
全体 : Filament of phosphofructokinase-1 liver isoform
全体
名称: Filament of phosphofructokinase-1 liver isoform
要素
複合体: Filament of phosphofructokinase-1 liver isoform
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超分子 #1: Filament of phosphofructokinase-1 liver isoform
超分子
名称: Filament of phosphofructokinase-1 liver isoform / タイプ: complex / ID: 1 / 親要素: 0 詳細: PFKL tetramers assembled into filaments by addition of ATP and fructose-6-phosphate