Structure of the glycosyltransferase EryCIII in complex with its activating P450 homologue EryCII.

Structure of the glycosyltransferase EryCIII in complex with its activating P450 homologue EryCII.
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糖基转移酶红细胞的结构及其激活的P450同源物erycii。

DOI:
10.1016/j.jmb.2011.10.036
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发表时间:
2012-01-06
影响因子:
5.6
通讯作者:
Leadlay, Peter F.
Leadlay, Peter F.
中科院分区:
生物学2区
文献类型:
--
作者:
Moncrieffe, Martin C.;Fernandez, Maria-Jose;Spiteller, Dieter;Matsumura, Hiroyoshi;Gay, Nicholas J.;Luisi, Ben F.;Leadlay, Peter F.

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在临床上重要的抗生素红霉素 D 的生物合成中,糖基转移酶 (GT) EryCIII 与其伙伴 EryCII 协同作用,以高特异性将核苷酸激活的糖附着到大环内酯支架上。为了了解 EryCII 的作用,我们以 3.1 Å 分辨率测定了 EryCIII·EryCII 复合物的晶体结构。该结构揭示了具有独特、细长四级组织的异四聚体。 EryCIII 亚基在复合物的中心形成广泛的自互补二聚体界面,而 EryCII 亚基位于外围。 EryCII 结合在 EryCIII 推定的大环内酯结合位点附近,但不与该位点直接相互作用。我们的生物物理和酶学数据支持 EryCII 稳定 EryCIII 并且还充当 GT 变构激活剂的模型。 ► 大环内酯GT和辅助蛋白的第一个结构。 ► EryCIII 和 EryCII 表达的新系统。 ► 辅助蛋白 (EryCII) 可稳定 GT (EryCIII)。 ► EryCII 具有细胞色素 P450 折叠,但具有额外的 N 末端螺旋。
In the biosynthesis of the clinically important antibiotic erythromycin D, the glycosyltransferase (GT) EryCIII, in concert with its partner EryCII, attaches a nucleotide-activated sugar to the macrolide scaffold with high specificity. To understand the role of EryCII, we have determined the crystal structure of the EryCIII·EryCII complex at 3.1 Å resolution. The structure reveals a heterotetramer with a distinctive, elongated quaternary organization. The EryCIII subunits form an extensive self-complementary dimer interface at the center of the complex, and the EryCII subunits lie on the periphery. EryCII binds in the vicinity of the putative macrolide binding site of EryCIII but does not make direct interactions with this site. Our biophysical and enzymatic data support a model in which EryCII stabilizes EryCIII and also functions as an allosteric activator of the GT. ► First structure of macrolide GT and auxiliary protein. ► New system for the expression of EryCIII and EryCII. ► Auxiliary protein (EryCII) stabilizes GT (EryCIII). ► EryCII has cytochrome P450 fold but possesses an additional N-terminal helix.
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发表时间: 2006-01-01
影响因子: 2.2
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