PMID- 12921993 OWN - NLM STAT- MEDLINE DCOM- 20031112 LR - 20210119 IS - 0168-1702 (Print) IS - 1872-7492 (Electronic) IS - 0168-1702 (Linking) VI - 95 IP - 1-2 DP - 2003 Sep TI - Nucleolar-cytoplasmic shuttling of PRRSV nucleocapsid protein: a simple case of molecular mimicry or the complex regulation by nuclear import, nucleolar localization and nuclear export signal sequences. PG - 23-33 AB - The order Nidovirales, which includes the arteriviruses and coronaviruses, incorporate a cytoplasmic replication scheme; however, the nucleocapsid (N) protein of several members of this group localizes to the nucleolus suggesting that viral proteins influence nuclear processes during replication. The relatively small, 123 amino acid, N protein of porcine reproductive and respiratory syndrome virus (PRRSV), an arterivirus, presents an ideal model system for investigating the properties and mechanism of N protein nucleolar localization. The PRRSV N protein is found in both cytoplasmic and nucleolar compartments during infection and after transfection of gene constructs that express N-enhanced green fluorescent protein (EGFP) fusion proteins. Experiments using oligopeptides, truncated polypeptides and amino acid-substituted proteins have identified several domains within PRRSV N protein that participate in nucleo-cytoplasmic shuttling, including a cryptic nuclear localization signal (NLS) called NLS-1, a functional NLS (NLS-2), a nucleolar localization sequence (NoLS), as well as a possible nuclear export signal (NES). The purpose of this paper is to review our current understanding of PRRSV N protein shuttling and propose a shuttling scheme regulated by RNA binding and post-translational modification. FAU - Rowland, Raymond R R AU - Rowland RR AD - Department of Diagnostic Medicine and Pathobiology, Kansas State University, Manhattan, KS 66506, USA. browland@vet.ksu.edu FAU - Yoo, Dongwan AU - Yoo D LA - eng GR - R15GM61319-01/GM/NIGMS NIH HHS/United States PT - Journal Article PT - Research Support, U.S. Gov't, Non-P.H.S. PT - Research Support, U.S. Gov't, P.H.S. PT - Review PL - Netherlands TA - Virus Res JT - Virus research JID - 8410979 RN - 0 (Nucleocapsid Proteins) RN - 0 (Protein Sorting Signals) SB - IM MH - Active Transport, Cell Nucleus MH - Animals MH - Cell Nucleolus/metabolism MH - Cell Nucleus/*metabolism MH - Cytoplasm/*metabolism MH - *Gene Expression Regulation, Viral MH - *Molecular Mimicry MH - Nucleocapsid Proteins/*metabolism MH - Porcine respiratory and reproductive syndrome virus/*metabolism MH - Protein Sorting Signals PMC - PMC7127199 EDAT- 2003/08/19 05:00 MHDA- 2003/11/13 05:00 PMCR- 2003/08/08 CRDT- 2003/08/19 05:00 PHST- 2003/08/19 05:00 [pubmed] PHST- 2003/11/13 05:00 [medline] PHST- 2003/08/19 05:00 [entrez] PHST- 2003/08/08 00:00 [pmc-release] AID - S0168170203001618 [pii] AID - 10.1016/s0168-1702(03)00161-8 [doi] PST - ppublish SO - Virus Res. 2003 Sep;95(1-2):23-33. doi: 10.1016/s0168-1702(03)00161-8.