| Project/Area Number |
23658282
|
|---|
| Research Category |
Grant-in-Aid for Challenging Exploratory Research
|
| Allocation Type | Multi-year Fund |
|---|
| Research Field |
Applied molecular and cellular biology
|
|---|
| Research Institution | University of Tsukuba |
|---|
Principal Investigator |
TAKAYA Naoki 筑波大学, 生命環境系, 教授 (50282322)
|
|---|
| Project Period (FY) |
2011 – 2012
|
| Project Status |
Completed (Fiscal Year 2013)
|
| Budget Amount *help |
¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2012: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2011: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
|
|---|
| Keywords | Nudix hydrolase / Sirtuin / histone / secondary metabolism / ヒストン / NADH / Aspergillus / NAD |
|---|
| Research Abstract |
We found Aspergillus nidulans gene encoding a sirtuin isozyme (SirA) with an amino acid identity of 47% to yeast Sir2p. Recombinant SirA exhibited nicotinamide sensitive NAD(+)-dependent HDAC activity, and deacetylated lysine 16 residue of histone H4 (H4K16), indicating that SirA is a fungal sirtuin counterpart. Gene disruptant of sirA accumulated more acetylated H4K16 at the gene promoters of ipnA and aflR and their transcripts and produced more penicillin G and sterigmatocystin, indicating that SirA removes H4K16 acetylation and represses the expression of these secondary metabolite genes. The increased cellular NAD+ and the decreased secondary metabolite production induced by adding nicotinamide riboside accompanied decreased levels of H4K16 acetylation at the ipnA and aflR gene promoters, which was not evident in the sirA gene disruptant. These results indicate that cellular NAD+ modulates the HDAC reaction by SirA.
|
