Dual targeting of the human cytomegalovirus UL37 exon 1 protein during permissive infection. 2004

Manohara S Mavinakere, and Anamaris M Colberg-Poley
Center for Cancer and Immunology Research, Children's Research Institute, Children's National Medical Center, 111 Michigan Avenue NW, Washington, DC 20010, USA.

The human cytomegalovirus (HCMV) UL37 immediate-early (IE) gene minimally encodes three protein isoforms that share NH(2)-terminal sequences. The predominant UL37 isoform detected during HCMV infection was the UL37 exon 1 protein (pUL37x1), which was produced from IE and, more abundantly, through late times of infection. pUL37x1 was localized in both the endoplasmic reticulum (ER) and mitochondria in infected cells. To determine which UL37x1 NH(2)-terminal residues serve as ER and mitochondrial targeting signals, we examined the subcellular localization of two deletion mutants. pUL37x1Delta2-23, which lacks the hydrophobic leader, is neither translocated into the ER nor imported mitochondrially; conversely, pUL37x1Delta23-34, lacking the juxtaposed basic residues, was translocated into the ER but only imported weakly into mitochondria. These studies show for the first time the temporal production and localization of pUL37x1 during HCMV infection. The trafficking patterns of mutants suggest that the pUL37x1 targeting signal to ER and mitochondria is bipartite.

UI MeSH Term Description Entries
D008928 Mitochondria Semiautonomous, self-reproducing organelles that occur in the cytoplasm of all cells of most, but not all, eukaryotes. Each mitochondrion is surrounded by a double limiting membrane. The inner membrane is highly invaginated, and its projections are called cristae. Mitochondria are the sites of the reactions of oxidative phosphorylation, which result in the formation of ATP. They contain distinctive RIBOSOMES, transfer RNAs (RNA, TRANSFER); AMINO ACYL T RNA SYNTHETASES; and elongation and termination factors. Mitochondria depend upon genes within the nucleus of the cells in which they reside for many essential messenger RNAs (RNA, MESSENGER). Mitochondria are believed to have arisen from aerobic bacteria that established a symbiotic relationship with primitive protoeukaryotes. (King & Stansfield, A Dictionary of Genetics, 4th ed) Mitochondrial Contraction,Mitochondrion,Contraction, Mitochondrial,Contractions, Mitochondrial,Mitochondrial Contractions
D003587 Cytomegalovirus A genus of the family HERPESVIRIDAE, subfamily BETAHERPESVIRINAE, infecting the salivary glands, liver, spleen, lungs, eyes, and other organs, in which they produce characteristically enlarged cells with intranuclear inclusions. Infection with Cytomegalovirus is also seen as an opportunistic infection in AIDS. Herpesvirus 5, Human,Human Herpesvirus 5,Salivary Gland Viruses,HHV 5,Herpesvirus 5 (beta), Human,Cytomegaloviruses,Salivary Gland Virus,Virus, Salivary Gland,Viruses, Salivary Gland
D004721 Endoplasmic Reticulum A system of cisternae in the CYTOPLASM of many cells. In places the endoplasmic reticulum is continuous with the plasma membrane (CELL MEMBRANE) or outer membrane of the nuclear envelope. If the outer surfaces of the endoplasmic reticulum membranes are coated with ribosomes, the endoplasmic reticulum is said to be rough-surfaced (ENDOPLASMIC RETICULUM, ROUGH); otherwise it is said to be smooth-surfaced (ENDOPLASMIC RETICULUM, SMOOTH). (King & Stansfield, A Dictionary of Genetics, 4th ed) Ergastoplasm,Reticulum, Endoplasmic
D005091 Exons The parts of a transcript of a split GENE remaining after the INTRONS are removed. They are spliced together to become a MESSENGER RNA or other functional RNA. Mini-Exon,Exon,Mini Exon,Mini-Exons
D006367 HeLa Cells The first continuously cultured human malignant CELL LINE, derived from the cervical carcinoma of Henrietta Lacks. These cells are used for, among other things, VIRUS CULTIVATION and PRECLINICAL DRUG EVALUATION assays. Cell, HeLa,Cells, HeLa,HeLa Cell
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D017353 Gene Deletion A genetic rearrangement through loss of segments of DNA or RNA, bringing sequences which are normally separated into close proximity. This deletion may be detected using cytogenetic techniques and can also be inferred from the phenotype, indicating a deletion at one specific locus. Deletion, Gene,Deletions, Gene,Gene Deletions
D017874 Immediate-Early Proteins Proteins that are coded by immediate-early genes, in the absence of de novo protein synthesis. The term was originally used exclusively for viral regulatory proteins that were synthesized just after viral integration into the host cell. It is also used to describe cellular proteins which are synthesized immediately after the resting cell is stimulated by extracellular signals. Proteins, Immediate-Early,Immediate Early Proteins,Proteins, Immediate Early
D021381 Protein Transport The process of moving proteins from one cellular compartment (including extracellular) to another by various sorting and transport mechanisms such as gated transport, protein translocation, and vesicular transport. Cellular Protein Targeting,Gated Protein Transport,Protein Targeting, Cellular,Protein Translocation,Transmembrane Protein Transport,Vesicular Protein Transport,Protein Localization Processes, Cellular,Protein Sorting,Protein Trafficking,Protein Transport, Gated,Protein Transport, Transmembrane,Protein Transport, Vesicular,Traffickings, Protein

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