کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1392403 | 983740 | 2010 | 11 صفحه PDF | دانلود رایگان |

SummaryPantothenate kinase (PanK) catalyzes the rate-controlling step in coenzyme A (CoA) biosynthesis. PanK3 is stringently regulated by acetyl-CoA and uses an ordered kinetic mechanism with ATP as the leading substrate. Biochemical analysis of site-directed mutants indicates that pantothenate binds in a tunnel adjacent to the active site that is occupied by the pantothenate moiety of the acetyl-CoA regulator in the PanK3⋅acetyl-CoA binary complex. A high-throughput screen for PanK3 inhibitors and activators was applied to a bioactive compound library. Thiazolidinediones, sulfonylureas and steroids were inhibitors, and fatty acyl-amides and tamoxifen were activators. The PanK3 activators and inhibitors either stimulated or repressed CoA biosynthesis in HepG2/C3A cells. The flexible allosteric acetyl-CoA regulatory domain of PanK3 also binds the substrates, pantothenate and pantetheine, and small molecule inhibitors and activators to modulate PanK3 activity.
Graphical AbstractFigure optionsDownload high-quality image (482 K)Download as PowerPoint slideHighlights
► PanK3 binds pantothenate within the acetyl-CoA regulatory site
► Thiazolidinediones and sulfonylureas are PanK3 inhibitors
► Tamoxifen and fatty acyl amides are PanK3 activators
► Flexible allosteric acetyl-CoA regulatory domain also binds substrates and small molecular inhibitors and activators
Journal: - Volume 17, Issue 8, 27 August 2010, Pages 892–902