锌α2糖蛋白凹槽中多种脂质结合模式的鉴定揭示了其功能的多功能性。

IF 5.5 2区 生物学 Q1 BIOCHEMISTRY & MOLECULAR BIOLOGY
FEBS Journal Pub Date : 2022-04-01 Epub Date: 2021-12-07 DOI:10.1111/febs.16293
Henna Zahid, Andy M Lau, Sharon M Kelly, Kersti Karu, Jayesh Gor, Stephen J Perkins, Lindsay C McDermott
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引用次数: 1

摘要

ZAG是一种多功能糖蛋白,具有一类mhc样蛋白折叠和α1-α2脂质结合沟。固有的ZAG配体是未知的。我们之前的研究表明,ZAG结合丹化C11脂肪酸DAUDA的方式与二吡咯甲烷硼C16脂肪酸C16 -BODIPY的方式不同。本文阐明了这种差异的分子基础。多波长超离心分析证实,DAUDA和C16 -BODIPY分别与ZAG结合并竞争同一结合位点。分化1蛋白结构相关簇的脂质结合分子对接预测了ZAG中9个保守的配体接触残基。通过丙氨酸扫描位点定向诱变,获得12个突变体进行鉴定。Y12突变导致ZAG错误折叠。K147、R157和A158的突变消除了C16 -BODIPY结合,但没有消除DAUDA结合。与野生型ZAG相比,L69和T169增加了C16 -BODIPY的荧光发射强度,而DAUDA的荧光发射强度没有增加,表明C16 -BODIPY与T169和L69的结合接近。晶体结构的距离测量显示K147与D83形成盐桥。包括磷脂和鞘脂在内的一系列生物活性大体积脂质将DAUDA从ZAG结合位点移走,但出乎意料地没有移走C16 -BODIPY。我们得出结论,ZAG α1-α2沟槽包含单独但重叠的DAUDA和C16 -BODIPY位点,并且与先前报道的更大更广泛的脂质结合有关。本研究提示ZAG的体内活性可能与其脂质配体有关。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Identification of diverse lipid-binding modes in the groove of zinc α2 glycoprotein reveals its functional versatility.

ZAG is a multifunctional glycoprotein with a class I MHC-like protein fold and an α1-α2 lipid-binding groove. The intrinsic ZAG ligand is unknown. Our previous studies showed that ZAG binds the dansylated C11 fatty acid, DAUDA, differently to the boron dipyrromethane C16 fatty acid, C16 -BODIPY. Here, the molecular basis for this difference was elucidated. Multi-wavelength analytical ultracentrifugation confirmed that DAUDA and C16 -BODIPY individually bind to ZAG and compete for the same binding site. Molecular docking of lipid-binding in the structurally related Cluster of differentiation 1 proteins predicted nine conserved ligand contact residues in ZAG. Twelve mutants were accordingly created by alanine scanning site directed mutagenesis for characterisation. Mutation of Y12 caused ZAG to misfold. Mutation of K147, R157 and A158 abrogated C16 -BODIPY but not DAUDA binding. L69 and T169 increased the fluorescence emission intensity of C16 -BODIPY but not of DAUDA compared to wild-type ZAG and showed that C16 -BODIPY binds close to T169 and L69. Distance measurements of the crystal structure revealed K147 forms a salt bridge with D83. A range of bioactive bulky lipids including phospholipids and sphingolipids displaced DAUDA from the ZAG binding site but unexpectedly did not displace C16 -BODIPY. We conclude that the ZAG α1-α2 groove contains separate but overlapping sites for DAUDA and C16 -BODIPY and is involved in binding to a bulkier and wider repertoire of lipids than previously reported. This work suggested that the in vivo activity of ZAG may be dictated by its lipid ligand.

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来源期刊
FEBS Journal
FEBS Journal 生物-生化与分子生物学
CiteScore
11.70
自引率
1.90%
发文量
375
审稿时长
1 months
期刊介绍: The FEBS Journal is an international journal devoted to the rapid publication of full-length papers covering a wide range of topics in any area of the molecular life sciences. The criteria for acceptance are originality and high quality research, which will provide novel perspectives in a specific area of research, and will be of interest to our broad readership. The journal does not accept papers that describe the expression of specific genes and proteins or test the effect of a drug or reagent, without presenting any biological significance. Papers describing bioinformatics, modelling or structural studies of specific systems or molecules should include experimental data.
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