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Lipid rafts are important for the association of RANK and TRAF6
하현일,HanBokKwak,SooWoongLee,Hong-HeeKim,이장희 생화학분자생물학회 2003 Experimental and molecular medicine Vol.35 No.4
Rafts, cholesterol- and sphingolipid-rich membrane microdomains, have been shown to play an im-portant role in immune cell activation. More re-cently rafts were implicated in the signal trans-receptor (TNFR) family. In this study, we provide evidences that the raft microdomain has a crucial role in RANK (receptor activator of NF-κB) signaling. We found that the majority of the ectopically expressed RANK and substantial portion of endogenous TRAF2 and TRAF6 were detected in the low-den-sity raft fractions. In adition, TRAF6 association with rafts was increased by RANKL stimulation. The disruption of rafts blocked the TRAF6 trans-teraction betwen RANK and TRAF6. Our obser-vations demonstrate that proper RANK signaling requires the function of raft membrane microdo-mains.
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Jung-MeeKim,YounmieJin,Chang-GuHyun,Jong-HeeKim,Hong-SubLee,Dae-KyungKang,Dae-JungKang,Tae-YongKim,Joo-WonSuh,Sang-SoonKang,Soon-KwangHong 한국미생물학회 2002 The journal of microbiology Vol.40 No.3
A 4.8-kb DNA fragment encoding the P-450 type hydroxylase and ferredoxin genes was cloned from Pseudonocardia autotrophica IFO 12743 that can convert vitamin D3 into its hydroxylated active forms. In order to isolate the P-450 gene cluster in this organism, we designed PCR primers on the basis of the regions of an oxygen binding site and a heme ligand pocket that are general characteristics of the P-450 hydroxylase. Sequencing analysis of the BamHI fragment revealed the presence of four complete and one incomplete ORFs, named PauA, PauB, PauC, and PauD, respectively. As a result of computer-based analyses, PauA and PauB have homology with enoyl-CoA hydratase from several organisms and the positive regulators belonging to the tetR family, respectively. PauC and PauD show similarity with SuaB/C proteins and ferredoxins, respectively, which are composed of P-450 monooxygenase systems for metabolizing two sulfonylurea herbicides in Streptomyces griseolus PauC shows the highest similarity with another CytP-450Sca2 protein that is responsible for production of a specific HMG-CoA reductase inhibitor, pravastatin, in S. carbophilus. Cultures of Streptomyces lividans transformant, containing the P-450 gene cluster on the pWHM3 plasmid, was unable to convert vitamin D3 to its hydroxylated forms.
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