Strand-specific affinity of host factor hnRNP C1/C2 guides positive to negative-strand ratio in Coxsackievirus B3 infection

Dave, Pratik and George, Biju and Balakrishnan, Sreenath and Sharma, Divya Khandige and Raheja, Harsha and Dixit, Narendra M and Das, Saumitra (2019) Strand-specific affinity of host factor hnRNP C1/C2 guides positive to negative-strand ratio in Coxsackievirus B3 infection. In: RNA BIOLOGY, 16 (9). pp. 1286-1299.

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Abstract

Coxsackievirus B3 is an enterovirus, with positive-sense single-stranded RNA genome containing `Internal Ribosome Entry Site' (IRES) in the 5MODIFIER LETTER PRIMEUTR. Once sufficient viral proteins are synthesized in the cell from the input RNA, viral template switches from translation to replication to synthesize negative-strand RNA. Inhibition of translation is a key step in regulating this switch as the positive-strand RNA template should be free of ribosomes to enable polymerase movement. In this study, we show how a host protein hnRNP C1/C2 inhibits viral RNA translation. hnRNP C1/C2 interacts with stem-loop V in the IRES and displaces poly-pyrimidine tract binding protein, a positive regulator of translation. We further demonstrate that hnRNP C1/C2 induces translation to replication switch, independently from the already known role of the ternary complex (PCBP2-3CD-cloverleaf RNA). These results suggest a novel function of hnRNP C1/C2 in template switching of positive-strand from translation to replication by a new mechanism. Using mathematical modelling, we show that the differential affinity of hnRNP C1/C2 for positive and negative-strand RNAs guides the final +/- RNA ratio, providing first insight in the regulation of the positive to negative-strand RNA ratio in enteroviruses.

Item Type:	Journal Article
Publication:	RNA BIOLOGY
Publisher:	TAYLOR & FRANCIS INC
Additional Information:	The copyright for this article belongs to TAYLOR & FRANCIS INC
Department/Centre:	Division of Biological Sciences > Microbiology & Cell Biology Division of Biological Sciences > Centre for Infectious Disease Research Division of Interdisciplinary Sciences > Centre for Biosystems Science and Engineering Division of Mechanical Sciences > Chemical Engineering
Date Deposited:	13 Nov 2019 05:31
Last Modified:	13 Nov 2019 05:55
URI:	http://eprints.iisc.ac.in/id/eprint/63225

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