| RRC ID |
39620
|
| Author |
Ayukawa K, Taniguchi S, Masumoto J, Hashimoto S, Sarvotham H, Hara A, Aoyama T, Sagara J.
|
| Title |
La autoantigen is cleaved in the COOH terminus and loses the nuclear localization signal during apoptosis.
|
| Journal |
J Biol Chem
|
| Abstract |
La autoantigen is a 47-kDa nuclear protein that binds to nascent polymerase III transcripts and a number of viral RNAs. We show that La protein was cleaved to generate a 43-kDa fragment during apoptosis of human leukemic HL-60 cells treated with camptothecin or etoposide. Immunofluorescence microscopy showed that the La protein level was increased in the cytoplasm during apoptosis of HL-60 cells. In addition, UV irradiation of HeLa cells led to the cleavage and redistribution of La protein upon apoptosis. Several lines of evidence show that La protein is cleaved by caspase-3 or closely related proteases at Asp-374 in the COOH terminus. When the full-length (La) and COOH-terminally truncated (La delta C374) forms of La protein were expressed as fusion proteins with green fluorescence protein (GFP), GFP-La delta C374 was predominantly cytoplasmic, whereas GFP-La was localized in the nucleus. These results suggest that La protein loses the nuclear localization signal residing in the COOH terminus upon cleavage and is thus redistributed to the cytoplasm during apoptosis.
|
| Volume |
275(44)
|
| Pages |
34465-70
|
| Published |
2000-11-3
|
| DOI |
10.1074/jbc.M003673200
|
| PII |
S0021-9258(20)88943-1
|
| PMID |
10913436
|
| MeSH |
Animals
Antibodies, Monoclonal / biosynthesis
Apoptosis*
Autoantibodies / biosynthesis
Autoantigens / chemistry
Autoantigens / immunology
Autoantigens / metabolism*
Base Sequence
Cell Line
DNA Primers
Humans
Hydrolysis
Mice
Nuclear Localization Signals*
Ribonucleoproteins / chemistry
Ribonucleoproteins / immunology
Ribonucleoproteins / metabolism*
|
| IF |
4.238
|
| Times Cited |
69
|
|
WOS Category
|
BIOCHEMISTRY & MOLECULAR BIOLOGY
|
| Resource |
| Human and Animal Cells |
P3-X63-Ag8.653(RCB0146) |
