Hymenoic acid, a novel specific inhibitor of human DNA polymerase λ from a fungus of Hymenochaetaceae sp.
- 作者：Masayuki Nishida ; Noriko Ida ; Mao Horio ; Toshifumi Takeuchi ; Shinji Kamisuki ; Hiroshi Murata ; Kouji Kuramochi ; Fumio Sugawara ; Hiromi Yoshida ; Yoshiyuki Mizushina
- 关键词：Hymenoic acid ; Sesquiterpene ; DNA polymerase λ ; Family X of DNA polymerases ; Enzyme inhibitor
- 刊名：Bioorganic and Medicinal Chemistry
- 出版年：2008
- 期刊代码：9_09680896
- 类别：ch
- 出版时间：1 May 2008
- 卷：16
- 期：9
- 页码：5115-5122
- 文件大小：324 K
摘要
Hymenoic acid (1) is a natural compound isolated from cultures of a fungus, Hymenochaetaceae sp., and this structure was determined by spectroscopic analyses. Compound 1 is a novel sesquiterpene, trans-4-[(1′E,5′S)-5′-carboxy-1′-methyl-1′-hexenyl]cyclohexanecarboxylic acid. This compound selectively inhibited the activity of human DNA polymerase λ (pol λ) in vitro, and 50%inhibition was observed at a concentration of 91.7 μM. Compound 1 did not influence the activities of the other seven mammalian pols (i.e., pols 
, γ, δ, ε, η, ι, and κ), but also showed no effect even on the activity of pol β, which is thought to have a very similar three-dimensional structure to the pol β-like region of pol λ. This compound also did not inhibit the activities of prokaryotic pols and other DNA metabolic enzymes tested. These results suggested that compound 1 could be a selective inhibitor of eukaryotic pol λ. This compound had no inhibitory activities against two N-terminal truncated pol λ, del-1 pol λ (lacking nuclear localization signal (NLS), BRCA1 C-terminus (BRCT) domain [residues 133–575]), and del-2 pol λ (lacking NLS, BRCT, domain and proline-rich region [residues 245–575]). The compound 1-induced inhibition of intact pol λ activity was non-competitive with respect to both the DNA template-primer and the dNTP substrate. On the basis of these results, the pol λ inhibitory mechanism of compound 1 is discussed.
, γ, δ, ε, η, ι, and κ), but also showed no effect even on the activity of pol β, which is thought to have a very similar three-dimensional structure to the pol β-like region of pol λ. This compound also did not inhibit the activities of prokaryotic pols and other DNA metabolic enzymes tested. These results suggested that compound 1 could be a selective inhibitor of eukaryotic pol λ. This compound had no inhibitory activities against two N-terminal truncated pol λ, del-1 pol λ (lacking nuclear localization signal (NLS), BRCA1 C-terminus (BRCT) domain [residues 133–575]), and del-2 pol λ (lacking NLS, BRCT, domain and proline-rich region [residues 245–575]). The compound 1-induced inhibition of intact pol λ activity was non-competitive with respect to both the DNA template-primer and the dNTP substrate. On the basis of these results, the pol λ inhibitory mechanism of compound 1 is discussed.