Akut gastroenterit hastalığının önemli nedenlerinden biri norovirüslerdir. Konakçı hücreye, hücre yüzeyindeki çoklu şeker halkalarından oluşan HGBA reseptörleri ile etkileşerek enfekte olurlar. Hücreye girmek için virüse ait kapsid proteini hücre yüzeyi reseptörleri ile kompleksleşir. Her ne kadar protein bazı ortak glikanların varlığında kompleks olarak başarılı bir şekilde kristalize edilmiş olsa da, şeker kısımlarının bağlanmasından kaynaklanan protein yapısındaki dinamik değişim henüz tam olarak aydınlatılamamıştır. Virüs proteinin HBGA'lara bağlanma mekanizmasını anlama ve gastroenterit hastalığına karşı tedavi stratejileri geliştirmesine yardımcı olması nedeniyle bu dinamik değişimi anlamak kritik derecede öneme sahiptir. Bu çalışmada, virüs enfeksiyonu için önemli olabilecek etkileşimler hakkında bilgi edinmek için yabanıl VP1 kapsit proteininin dinamik özelliklerini moleküler dinamik metotlarla hesapladık. Şeker kısmının bağlanmasının, bağlanma bölgesinde gözle görülür dinamik değişikliklere neden olmadığını tespit ettik. Bununla birlikte, ilginç bir şekilde, allosterik bir etkinin göstergesi olabilecek 395-400 numaralı sekansa ait amino asitlerinde ihmal edilemeyecek bir hareketlilik meydana geldiğini gözlemledik.

MOLECULAR DYNAMICS STUDIES OF THE NOROVIRUS-HOST CELL INTERACTION MEDIATED BY H-TYPE 1 ANTIGEN

Noroviruses are the main cause for acute gastroenteritis disease. They infect the host cell via interaction with HGBA receptors on the cell surface. Virus makes complex with cell surface receptors through its capsid protein VP1 to enter the cell. Although the protein has been successfully crystallized in the presence of some common glycans, the dynamic change in the protein structure when interacting with sugar moieties has yet to be fully elucidated. This is critically important since it leads to understanding the protein’s recognition mechanism of HBGAs and develop therapeutic strategies against the gastroenteritis disease. Here, we computationally assessed the dynamic features of wild type VP1 envelope protein to get insights into the interactions that can be important for virus infectivity. We have found that the binding of sugar moiety does not cause noticeable dynamic changes in the binding region. However, interestingly, a drastic change occurs in a distant loop lying at the residue numbers of 395-400, which might be indication of an allosteric effect.

Keywords:

Norovirus, therapeutic antibody HBGA blockage, molecular dynamics,

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