HERPESVIRUS PROTEINASE--POSSIBLE TARGET FOR ANTIVIRALS

描述：疱疹组病毒编码一种丝氨酸成熟蛋白酶 这是产生传染性后代所必需的。 的 这种蛋白质的巨细胞病毒（CMV）同源物称为装配蛋白， 由人CMV中的UL 80 a开放阅读框架编码。 阿森布林群岛 作为前体（~ 74 kDa）合成，其经历四个连续的 自蛋白水解裂解。 四个切割位点具有五个氨基酸， 核心共有序列在它们的对应物中非常保守， 其他疱疹病毒 装配的主要底物是一种丰富的 衣壳装配蛋白，也含有M-切割位点在其 羧基末端，由于其有趣的框内，嵌套遗传 与蛋白酶的关系 因为这些裂解对于病毒产生是必需的，所以抑制这些裂解是必要的。 预期该蛋白酶具有有效的抗病毒作用。 新 需要具有抗疱疹病毒活性的药物， 本申请中提出的研究旨在进一步 表征的物理，酶，和生物学特性的 疱疹病毒蛋白酶，特别是CMV酶，并帮助利用它作为 药物开发的有效分子靶点。 在这次竞争性更新中提出的工作的具体目标 应用是：（i）制备蛋白酶和组装蛋白前体， 用于酶测定和晶体学; ii）开发体外蛋白酶 使用“天然”底物的测定（iii）确定什么裂解位点 特征影响裂解动力学;（iv）识别相互作用域 （v）合作研究和比较gamma-2 HHV 8 使用其Alpha进行组装（例如，单纯疱疹病毒）和β（例如，CMV） 疱疹病毒同源物;（vi）在细胞培养物中测试潜在抗病毒剂;和 (vii)确定病毒“逃脱”其影响的能力。 这项工作的结果预计将提供有用的新信息， 这显然是丝氨酸蛋白酶家族的新成员，并有助于 开发出抑制剂来阻止它的功能。 也是 可能会在病毒领域产生有用的新信息， 蛋白酶机制和疱疹病毒复制。

DESCRIPTION: Herpes-group viruses encode a serine maturational proteinase that is essential for the production of infectious progeny. The cytomegalovirus (CMV) homologue of this protein is called assemblin and is encoded by the UL80a open reading frame in human CMV. Assemblin is synthesized as a precursor (~74kDa) that undergoes four sequential autoproteolytic cleavages. The four cleavage sites have five amino acid, core consensus sequences that are well conserved among their counterparts in other herpes virus. The principal substrate of assemblin is an abundant capsid assembly protein that also contains the M-cleavage site at its carboxyl end, as a consequence of its interesting in-frame, nested genetic relationship with the proteinase. Because these cleavages are essential for virus production, inhibition of the proteinase would be expected to have a potent antiviral effect. New drugs with antiviral activity against herpes-group viruses are needed, and the studies proposed in this application are intended to further characterize the physical, enzymatic, and biological properties of the herpesvirus proteinase, in particular the CMV enzyme, and help exploit it as an effective molecular target for drug development. The specific aims of the work proposed in this competitive renewal application are: (i) prepare proteinase and assembly protein precursors for use in enzyme assays and crystallography; ii) develop an in vitro proteinase assay that uses "native" substrate' (iii) determine what cleavage-site features influence cleavage kinetics; (iv) identify the interactive domains of two chain assemblin; (v) collaborate to study and compare gamma-2 HHV8 assemblin with its alpha (e.g., herpes simplex virus) and beta (e.g., CMV) herpesvirus homologues; (vi) test potential antivirals in cell culture; and (vii) determine the ability of virus to "escape" their effect. Results of this work are anticipated to provide useful new information about this apparently novel member of the serine proteinase family, and contribute to the development of inhibitors that will block its function. It is also likely that useful new information will be generated in the areas of viral proteinase mechanisms and herpesvirus replication.