NMR insights into β-Lactamase activity of UVI31+ Protein from Chlamydomonas reinhardtii

IF 2 3区 化学 Q3 BIOCHEMICAL RESEARCH METHODS
Ashok K. Rout , Saurabh Gautam , Vipin Kumar Mishra , Mandar Bopardikar , Budheswar Dehury , Himanshu Singh
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Abstract

β-Lactamases (EC 3.5.2.6) confer resistance against β-lactam group-containing antibiotics in bacteria and higher eukaryotes, including humans. Pathogenic bacterial resistance against β-lactam antibiotics is a primary concern for potential therapeutic developments and drug targets. Here, we report putative β-lactamase activity, sulbactam binding (a β-lactam analogue) in the low μM affinity range, and site-specific interaction studies of a 14 kDa UV- and dark-inducible protein (abbreviated as UVI31+, a BolA homologue) from Chlamydomonas reinhartii. Intriguingly, the solution NMR structure of UVI31 + bears no resemblance to other known β-lactamases; however, the sulbactam binding is found at two sites rich in positively charged residues, mainly at the L2 loop regions and the N-terminus. Using NMR spectroscopy, ITC and MD simulations, we map the ligand binding sites in UVI31 + providing atomic-level insights into its β-lactamase activity. Current study is the first report on β-lactamase activity of UVI31+, a BolA analogue, from C. reinhartii. Furthermore, our mutation studies reveal that the active site serine-55 is crucial for β-lactamase activity.

Abstract Image

NMR 透视衣藻 UVI31+ 蛋白的β-内酰胺酶活性
β-内酰胺酶(EC 3.5.2.6)使细菌和包括人类在内的高等真核生物对含β-内酰胺类抗生素产生耐药性。致病细菌对β-内酰胺类抗生素的耐药性是潜在治疗开发和药物靶点的首要问题。在此,我们报告了一种来自莱茵衣藻(Chlamydomonas reinhartii)的 14 kDa 紫外线和黑暗诱导蛋白(缩写为 UVI31+,一种 BolA 同源物)的推定 β-内酰胺酶活性、与舒巴坦(一种 β-内酰胺类似物)在低 μM 亲和力范围内的结合以及特定位点相互作用研究。有趣的是,UVI31 + 的溶液核磁共振结构与其他已知的 β-内酰胺酶并不相似;然而,舒巴坦的结合点位于两个富含正电荷残基的位点,主要在 L2 环区域和 N 端。利用核磁共振光谱、ITC 和 MD 模拟,我们绘制了 UVI31 + 的配体结合位点图,为了解其 β-内酰胺酶活性提供了原子层面的见解。目前的研究首次报道了来自 C. reinhartii 的 BolA 类似物 UVI31+ 的 β-内酰胺酶活性。此外,我们的突变研究发现,活性位点丝氨酸-55对β-内酰胺酶活性至关重要。
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来源期刊
CiteScore
3.80
自引率
13.60%
发文量
150
审稿时长
69 days
期刊介绍: The Journal of Magnetic Resonance presents original technical and scientific papers in all aspects of magnetic resonance, including nuclear magnetic resonance spectroscopy (NMR) of solids and liquids, electron spin/paramagnetic resonance (EPR), in vivo magnetic resonance imaging (MRI) and spectroscopy (MRS), nuclear quadrupole resonance (NQR) and magnetic resonance phenomena at nearly zero fields or in combination with optics. The Journal''s main aims include deepening the physical principles underlying all these spectroscopies, publishing significant theoretical and experimental results leading to spectral and spatial progress in these areas, and opening new MR-based applications in chemistry, biology and medicine. The Journal also seeks descriptions of novel apparatuses, new experimental protocols, and new procedures of data analysis and interpretation - including computational and quantum-mechanical methods - capable of advancing MR spectroscopy and imaging.
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