STRUCTURAL STUDIES OF PROTEINS INVOLVED IN THE LPS BIOSYNTHETIC PATHWAY

这个子项目是许多研究子项目中的一个 由NIH/NCRR资助的中心赠款提供的资源。子项目和 研究者（PI）可能从另一个NIH来源获得主要资金， 因此可以在其他CRISP条目中表示。列出的机构是 研究中心，而研究中心不一定是研究者所在的机构。 脂多糖（LPS）是革兰氏阴性细菌细胞壁的主要成分。LPS由三种组分组成：脂质A、核心多糖（Kdo和一个或多个庚糖残基）和多糖侧链。在添加庚糖之前停止的LPS生物合成导致深粗糙表型，并且膜对抗生素的渗透性增加。因此，庚糖生物合成途径已被标记为潜在的药物靶点。我们的目标是确定GmhA的机制，GmhA是催化ADP-L-甘油-甘露-庚糖生物合成的第一个关键步骤的异构酶，以及GmhB和HldE也是LPS生物合成的关键参与者。确定这些蛋白质使用的酶促机制将有助于合理设计GmhA、GmhB和HldE抑制剂，作为对抗革兰氏阴性菌感染的手段。

This subproject is one of many research subprojects utilizing the resources provided by a Center grant funded by NIH/NCRR. The subproject and investigator (PI) may have received primary funding from another NIH source, and thus could be represented in other CRISP entries. The institution listed is for the Center, which is not necessarily the institution for the investigator. Lipopolysaccharide (LPS) is a major component of the Gram-negative bacterial cell wall. LPS is comprised of three components: lipid A, core polysaccharide (Kdo and one or more heptose residues), and polysaccharide side chains. LPS biosynthesis that is halted prior to heptose addition results in a deep-rough phenotype and membrane permeability to antibiotics is increased. For this reason, the heptose biosynthetic pathway has been marked as a potential drug target. Our goal is to determine the mechanism of GmhA, an isomerase that catalyzes the first committed step of ADP-L-glycero-¿¿¿x-manno-heptose biosynthesis as well as GmhB and HldE which are also key players in LPS biosynthesis. Determination of the enzymatic mechanisms used by these proteins will aid in the rational design of inhibitors of GmhA, GmhB and HldE as a means to combat Gram negative infection.