Abstract
All coronaviruses possess small open reading frames (ORFs) between structural genes that have been hypothesized to play important roles in pathogenesis. Infections bronchitis virus (IBV) ORF 3a is one such gene. It is highly conserved among group 3 coronaviruses, suggesting that it has an important function in infection. IBV 3a protein is expressed in infected cells but is not detected in virions. Sequence analysis predicted that IBV 3a was a membrane protein; however, only a fraction behaved like an integral membrane protein. Microscopy and immunoprecipitation studies demonstrated that IBV 3a localized to the cytoplasm in a diffuse pattern as well as in sharp puncta in both infected and transfected cells. These puncta did not overlap cellular organelles or other punctate structures. Confocal microscopy demonstrated that IBV 3a puncta lined up along smooth endoplasmic reticulum (ER) tubules and, in a significant number of instances, were partially surrounded by these tubules. Our results suggest that IBV 3a is partially targeted to a novel domain of the smooth ER.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 6142-6151 |
| Number of pages | 10 |
| Journal | Journal of Virology |
| Volume | 79 |
| Issue number | 10 |
| DOIs | |
| State | Published - May 2005 |
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ASJC Scopus subject areas
- Immunology
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Infectious bronchitis virus 3a protein localizes to a novel domain of the smooth endoplasmic reticulum. / Pendleton, Amanda R.; Machamer, Carolyn E.
In: Journal of Virology, Vol. 79, No. 10, 05.2005, p. 6142-6151.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Infectious bronchitis virus 3a protein localizes to a novel domain of the smooth endoplasmic reticulum
AU - Pendleton, Amanda R.
AU - Machamer, Carolyn E
PY - 2005/5
Y1 - 2005/5
N2 - All coronaviruses possess small open reading frames (ORFs) between structural genes that have been hypothesized to play important roles in pathogenesis. Infections bronchitis virus (IBV) ORF 3a is one such gene. It is highly conserved among group 3 coronaviruses, suggesting that it has an important function in infection. IBV 3a protein is expressed in infected cells but is not detected in virions. Sequence analysis predicted that IBV 3a was a membrane protein; however, only a fraction behaved like an integral membrane protein. Microscopy and immunoprecipitation studies demonstrated that IBV 3a localized to the cytoplasm in a diffuse pattern as well as in sharp puncta in both infected and transfected cells. These puncta did not overlap cellular organelles or other punctate structures. Confocal microscopy demonstrated that IBV 3a puncta lined up along smooth endoplasmic reticulum (ER) tubules and, in a significant number of instances, were partially surrounded by these tubules. Our results suggest that IBV 3a is partially targeted to a novel domain of the smooth ER.
AB - All coronaviruses possess small open reading frames (ORFs) between structural genes that have been hypothesized to play important roles in pathogenesis. Infections bronchitis virus (IBV) ORF 3a is one such gene. It is highly conserved among group 3 coronaviruses, suggesting that it has an important function in infection. IBV 3a protein is expressed in infected cells but is not detected in virions. Sequence analysis predicted that IBV 3a was a membrane protein; however, only a fraction behaved like an integral membrane protein. Microscopy and immunoprecipitation studies demonstrated that IBV 3a localized to the cytoplasm in a diffuse pattern as well as in sharp puncta in both infected and transfected cells. These puncta did not overlap cellular organelles or other punctate structures. Confocal microscopy demonstrated that IBV 3a puncta lined up along smooth endoplasmic reticulum (ER) tubules and, in a significant number of instances, were partially surrounded by these tubules. Our results suggest that IBV 3a is partially targeted to a novel domain of the smooth ER.
UR - http://www.scopus.com/inward/record.url?scp=18144364295&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=18144364295&partnerID=8YFLogxK
U2 - 10.1128/JVI.79.10.6142-6151.2005
DO - 10.1128/JVI.79.10.6142-6151.2005
M3 - Article
C2 - 15857999
AN - SCOPUS:18144364295
VL - 79
SP - 6142
EP - 6151
JO - Journal of Virology
JF - Journal of Virology
SN - 0022-538X
IS - 10
ER -