通过序列分析和AlphaFold2-预测模型,识别了对人类G6PC2功能至关重要的结构动图
Emily M Hawes1, Derek P Claxton1, James K Oeser1
1Department of Molecular Physiology and Biophysics, Vanderbilt University School of Medicine, Nashville, TN 37232, U.S.A.
Bioscience reports
|December 14, 2023
概括
研究人员研究了G6PC2蛋白质,该蛋白质对于调节禁食血糖 (FBG) 至关重要. 他们发现特定的结构特征和共同的遗传变异影响其活性,可能引导开发新的FBG降低药物.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 遗传学 遗传学 是一个
背景情况:
- G6PC2 (葡萄糖-6-酸酶催化子单元2) 在胰腺岛贝塔细胞中表达,通过调节胰岛素分泌灵敏度来调节禁食血糖 (FBG).
- 了解G6PC2的结构功能关系是开发治疗葡萄糖代谢障碍的治疗策略的关键.
研究的目的:
- 为了验证人类G6PC2.2.的AlphaFold2预测结构.
- 阐明特定G6PC2基因和常见SNP (rs492594) 在蛋白质表达和酶活性中的功能作用.
- 为了研究胆固醇对G6PC2变体活性的影响.
主要方法:
- 对G6PC2的突变分析,包括形成二硫化键的残留物,PAP2图案,基质腔和CRAC图案.
- 从异质表达系统中溶解和净化人类G6PC2.
- 酶活性测定使用微体制剂和纯化的G6PC2,有或没有胆固醇 Hemi-succinate.
主要成果:
- 二硫化键残留物对于G6PC2表达是必不可少的; PAP2基因残留物对酶活性至关重要.
- 基质腔残留物调节酶活性和特异性;CRAC动机残留物影响表达或活性.
- 常见的Val219Leu SNP (rs492594) 在膜中表现出差异性活性,但在净化后这种活性会减少,这表明胆固醇相互作用会影响变体的功能. 胆固醇的添加降低了两种变体的Vmax.
结论:
- 对G6PC2的结构和功能表征提供了对其催化机制和调节的洞察.
- 这些发现突显了胆固醇在调节G6PC2变异活性中的作用,特别是关于Val219Leu SNP.
- 这项研究为设计向G6PC2抑制剂以降低FBG奠定了基础.
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