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Salicylihalamide A inhibits the V0 sector of the V-ATPase through a mechanism distinct from bafilomycin A1.
Journal of Biological Chemistry ( IF 4.0 ) Pub Date : 2004 May 7 , DOI: 10.1074/jbc.m313796200
Xiao-Song Xie , David Padron , Xibin Liao , Jin Wang , Michael G. Roth , Jef K. De Brabander

The newly identified specific V-ATPase inhibitor, salicylihalamide A, is distinct from any previously identified V-ATPase inhibitors in that it inhibits only mammalian V-ATPases, but not those from yeast or other fungi (Boyd, M. R., Farina, C., Belfiore, P., Gagliardi, S., Kim, J. W., Hayakawa, Y., Beutler, J. A., McKee, T. C., Bowman, B. J., and Bowman, E. J. (2001) J. Pharmacol. Exp. Ther. 297, 114-120). In addition, salicylihalamide A does not compete with concanamycin or bafilomycin for binding to V-ATPase, indicating that it has a different binding site from those classic V-ATPase inhibitors (Huss, M., Ingenhorst, G., Konig, S., Gassel, M., Drose, S., Zeeck, A., Altendorf, K., and Wieczorek, H. (2002) J. Biol. Chem. 277, 40544-40548). By using purified bovine brain V-pump and its dissociated V(1) and V(0) sectors, we identified the recognition and binding site for salicylihalamide to be within the V(0) domain. Salicylihalamide does not inhibit the ATP hydrolysis activity of the dissociated V(1)-ATPase but inhibits the ATPase activity of the holoenzyme by inhibiting the V(0) domain. Salicylihalamide causes a dramatic redistribution of cytosolic V(1) from soluble to membrane-associated form, a change not observed in cells treated with either bafilomycin or NH(4)Cl. By synthesizing and characterizing a series of salicylihalamide derivatives, we investigated the structural determinants of salicylihalamide inhibition in terms of potency and reversibility, and used this information to suggest a possible binding mechanism.

中文翻译:

水杨酰卤酰胺A通过不同于杆状霉素A1的机制抑制V-ATPase的V0区段。

新近鉴定出的特异性V-ATPase抑制剂水杨酰卤酰胺A与任何先前鉴定出的V-ATPase抑制剂的不同之处在于,它仅抑制哺乳动物的V-ATPase,而不能抑制来自酵母菌或其他真菌(Boyd,MR,Farina,C。 Belfiore,P.,Gagliardi,S.,Kim,JW,Hayakawa,Y.,Beutler,JA,McKee,TC,Bowman,BJ和Bowman,EJ(2001)J.Pharmacol.Exp.Ther.297,114- 120)。另外,水杨酰卤酰胺A不能与刀豆霉素或巴氟霉素竞争与V-ATPase的结合,这表明它与那些经典的V-ATPase抑制剂具有不同的结合位点(Huss,M.,Ingenhorst,G.,Konig,S., Gassel,M.,Drose,S.,Zeeck,A.,Altendorf,K。,和Wieczorek,H。(2002)J.Biol.Chem.277,40544-40548)。通过使用纯化的牛脑V泵及其分离的V(1)和V(0)扇区,我们确定了水杨柳酰胺的识别和结合位点在V(0)域内。Salicyhalhalamide不会抑制离解的V(1)-ATPase的ATP水解活性,但会通过抑制V(0)域来抑制全酶的ATPase活性。水杨酰卤胺引起胞浆V(1)从可溶形式急剧重新分布到膜相关形式,这种变化在用bafilomycin或NH(4)Cl处理的细胞中未观察到。通过合成和表征一系列水杨酰卤酰胺衍生物,我们研究了水杨酰卤酰胺抑制作用的结构决定因素,并利用该信息提出了可能的结合机理。Salicyhalhalamide不会抑制离解的V(1)-ATPase的ATP水解活性,但会通过抑制V(0)域来抑制全酶的ATPase活性。水杨酰卤胺引起胞浆V(1)从可溶形式急剧重新分布到膜相关形式,这种变化在用bafilomycin或NH(4)Cl处理的细胞中未观察到。通过合成和表征一系列水杨酰卤酰胺衍生物,我们研究了水杨酰卤酰胺抑制作用的结构决定因素,并利用该信息提出了可能的结合机理。Salicyhalhalamide不会抑制离解的V(1)-ATPase的ATP水解活性,但会通过抑制V(0)域来抑制全酶的ATPase活性。水杨酰卤胺引起胞浆V(1)从可溶形式急剧重新分布到膜相关形式,这种变化在用bafilomycin或NH(4)Cl处理的细胞中未观察到。通过合成和表征一系列水杨酰卤酰胺衍生物,我们研究了水杨酰卤酰胺抑制作用的结构决定因素,并利用该信息提出了可能的结合机理。在用bafilomycin或NH(4)Cl处理的细胞中未观察到变化。通过合成和表征一系列水杨酰卤酰胺衍生物,我们研究了水杨酰卤酰胺抑制作用的结构决定因素,并以此为基础提出了可能的结合机理。在用bafilomycin或NH(4)Cl处理的细胞中未观察到变化。通过合成和表征一系列水杨酰卤酰胺衍生物,我们研究了水杨酰卤酰胺抑制作用的结构决定因素,并利用该信息提出了可能的结合机理。
更新日期:2017-01-31
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