Adenovirus type 41 lacks an RGD αv-integrin binding motif on the penton base and undergoes delayed uptake in A549 cells

被引:79
作者
Albinsson, B [1 ]
Kidd, AH [1 ]
机构
[1] Umea Univ, Dept Virol, S-90185 Umea, Sweden
基金
英国医学研究理事会;
关键词
entry; endosome; cell receptor; subgenus F; adenovirus; 40; 41;
D O I
10.1016/S0168-1702(99)00087-8
中图分类号
Q93 [微生物学];
学科分类号
071005 ; 100705 ;
摘要
Human adenovirus (Ad) types 2, 3 and 12 are known to interact with cell surface integrins alpha(v)beta(3) and alpha(v)beta(3) through an RGD motif carried by the penton base. This interaction is thought to augment virus entry after initial contact between the fiber and specific receptor(s). Ad40 and Ad41 are the only members of the human subgroup F adenoviruses. The penton base protein sequence of one Ad40 strain is known to carry the motif RGAD rather than RGD, suggesting that not all human adenoviruses use the above integrins for cell entry. We confirmed that different genomic variants of Ad40 all carry an RGAD motif on the penton base, and found that the Ad41 prototype and several other genomic variants of Ad41 carry the motif IGDD in place of RGAD or RGD. This region is most likely exposed on the Ad41 particle, but attempts to block Ad41 infectivity using a homologous peptide were unsuccessful. Infectivity of an Ad41 preparation as measured by fluorescent focus assay in A549 cells was highly dependent on the length of the adsorption period, indicating that fiber-mediated attachment is inefficient in these cells. Moreover, Ad41 virions adsorbed for 1 h were internalized in a semi-linear fashion over 8 h. This inefficient uptake may be a direct consequence of independence of subgroup F adenoviruses from alpha(v)beta(3) and alpha(v)beta(5) integrin-mediated endocytosis. Ad40 and Ad41 may thus have lost or may never have developed a dependence on the penton base RGD motif for entry. (C) 1999 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:125 / 136
页数:12
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