Thermal stability of RNA phage virus-like particles displaying foreign peptides.

Thermal stability of RNA phage virus-like particles displaying foreign peptides.
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DOI:
10.1186/1477-3155-9-22
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发表时间:
2011-05-24
影响因子:
10.2
通讯作者:
Peabody DS
Peabody DS
中科院分区:
工程技术1区
文献类型:
--
作者:
Caldeira JC;Peabody DS

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为了对外源肽的遗传展示有用,病毒外壳蛋白必须耐受肽的插入,而不会严重破坏亚基折叠和衣壳组装。RNA噬菌体MS2的外壳蛋白的折叠通常不能容忍插入到它的ab环中,但是一个工程单链二聚体很容易接受它们,只要它们被限制在它的两个半部分中的一个。在这里,我们描述了肽插入对MS2病毒样颗粒(VLPs)热稳定性的影响,在外壳蛋白单链二聚体的一个ab环中显示了多种不同的肽。这些颗粒通常在比未改性的VLPs低约5-10°C的温度下变性。即便如此,它们通常在50°C左右是稳定的。相关RNA噬菌体PP7的VLPs与亚基间二硫键交联,因此明显更稳定。ab环的插入也降低了PP7 VLPs的稳定性,但它们仅在大约70°C以上才开始变性。由MS2单链二聚体外壳蛋白组装而成的VLPs在其中一个ab环中插入肽,其稳定性略低于野生型颗粒,但仍能抵抗高达50°C左右的加热。因为它们具有二硫交联,pp7衍生的VLPs提供了一个具有更高稳定性的替代平台。
To be useful for genetic display of foreign peptides a viral coat protein must tolerate peptide insertions without major disruption of subunit folding and capsid assembly. The folding of the coat protein of RNA phage MS2 does not normally tolerate insertions in its AB-loop, but an engineered single-chain dimer readily accepts them as long as they are restricted to one of its two halves. Here we characterize the effects of peptide insertions on the thermal stabilities of MS2 virus-like particles (VLPs) displaying a variety of different peptides in one AB-loop of the coat protein single-chain dimer. These particles typically denature at temperatures around 5-10°C lower than unmodified VLPs. Even so, they are generally stable up to about 50°C. VLPs of the related RNA phage PP7 are cross-linked with intersubunit disulfide bonds and are therefore significantly more stable. An AB-loop insertion also reduces the stability of PP7 VLPs, but they only begin to denature above about 70°C. VLPs assembled from MS2 single-chain dimer coat proteins with peptide insertions in one of their AB-loops are somewhat less stable than the wild-type particle, but still resist heating up to about 50°C. Because they possess disulfide cross-links, PP7-derived VLPs provide an alternate platform with even higher stability.
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发表时间: 1993-11-01
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发表时间: 1996-06-15
影响因子: 14.9
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