Affordable sialoglycans and associated reagents for expanded chemoenzymatic production

项目摘要 唾液酸寡糖是一种含唾液酸的低聚糖，在人类生物学和生物化学中具有重要的生物学作用。 是研究与细菌和病毒感染、癌症相关的必不可少的分子探针 转移、免疫调节等。母乳中唾液聚糖的多方面功能也正在被 探索过了。尽管如此，与唾液聚糖相关的治疗学和诊断学的研究和开发 由于获得这些结构复杂化合物的机会有限，以及高昂的成本和 合成和提纯这些试剂所需的特殊专业知识。 在生产唾液酸聚糖的各种合成策略中，基于糖基转移酶的化合酶 方法是吸引人的策略。一种合成结构确定的唾液酸聚糖的有效方法是一种- 加州大学戴维斯分校的海宇博士和陈曦博士开发了盆栽多酶(OPME)化学酶策略。每个人 OPME糖基化反应包含糖基转移酶和参与产生 相应的糖核苷酸供体来自于原位的简单单糖。OPME反应允许 合成具有高区域和立体特异性的含有所需糖苷连接的靶多聚糖。在… 在现阶段，OPME系统的大规模合成仍然受到规模和产量的限制 所产生的酶。此外，还可以改进OPME反应条件，以减少酶的用量 用于合成。产品提纯流程也可以使用创新的策略进行简化。 为了推进与唾液酸相关的研究和治疗开发，这项拟议项目的目标是 开发准备好商业化的试剂、酶和方法，以便以低成本获得 广泛科学界对唾液酸聚糖的高需求及其潜在的唾液酸聚糖(两者 学术界和工业界)，并能够高效地生产各种具有生物重要性的特制食品 唾液酸聚糖甚至是非专业人士的靶标。这将通过加州大学戴维斯分校团队与 IMCS拥有发酵生产高产酶的专业知识，独特的裂解技术，商业化 基础设施来制造，并以负担得起的价格向社区销售产品。

Project Summary Sialoglycans are sialic acid-containing oligosaccharides that play important biological roles in human biology and pathology and are indispensable molecular probes for research related to bacterial and viral infection, cancer metastasis, immune regulation, etc. The multifaceted functions of sialoglycans in human milk are also being explored. Nevertheless, sialoglycan-related research and development of therapeutics and diagnostics have been hampered by the limited access to these structurally complex compounds as well as the high cost and special expertise needed for synthesizing and purifying these reagents. Among various synthetic strategies for producing sialoglycans, glycosyltransferase-based chemoenzymatic methods are attractive strategies. An efficient method for synthesizing structurally defined sialoglycans is one- pot multienzyme (OPME) chemoenzymatic strategy developed by Dr. Hai Yu and Dr. Xi Chen at UC Davis. Each OPME glycosylation reaction contains a glycosyltransferase and enzymes involved in generating the corresponding sugar nucleotide donor in situ from a simple monosaccharide. The OPME reactions allow the synthesis of target glycans containing the desired glycosidic linkage with high regio- and stereo-specificity. At the current stage, large-scale synthesis by the OPME systems is still limited by the scales and the yields of the enzymes produced. In addition, OPME reaction conditions can be improved to decrease the amounts of enzymes used for the synthesis. Product purification processes can also be streamlined using innovative strategies. To advance sialic acid-related research and therapeutic development, the goal of this proposed project is to develop reagents, enzymes, and methods that are ready for commercialization to allow low-cost access to sialoglycans of high demands and their underlying asialoglycans by the broad scientific community (both academic and industry) and to enable highly efficient production of diverse biologically important special sialoglycan targets by even nonspecialists. This will be achieved by the collaboration of the UC Davis team with IMCS which has expertise in high-yield enzyme production by fermentation, unique lysis technique, commercial infrastructure to manufacture, and product sale at affordable prices to the community.