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J. Biol. Chem., Vol. 276, Issue 36, 33444-33451, September 7, 2001
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,
From the School of Biomedical Sciences, University of Nottingham,
Queen's Medical Centre, Nottingham NG7 2UH, United Kingdom and
§ Kimmel Cancer Center, Thomas Jefferson University,
Philadelphia, Pennsylvania 19107-5541
Apoptosis involves the cessation of cellular
processes, the breakdown of intracellular organelles, and, finally, the
nonphlogistic clearance of apoptotic cells from the body. Important for
these events is a family of proteases, caspases, which are activated by
a proteolytic cleavage cascade and drive apoptosis by targeting key
proteins within the cell. Here, we demonstrate that serum response
factor (SRF), a transcription factor essential for proliferative gene
expression, is cleaved by caspases and that this cleavage occurs in
proliferating murine fibroblasts and can be induced in the human B-cell
line BJAB. We identify the two major sites at which SRF cleavage occurs
as Asp245 and Asp254, the caspases
responsible for the cleavage and generate a mutant of SRF resistant to
cleavage in BJAB cells. Investigation of the physiological and
functional significance of SRF cleavage reveals that it correlates with
the loss of c-fos expression, whereby neither SRF cleavage
fragment retains transcriptional activity. Moreover, the expression of
a noncleavable SRF in BJAB cells suppresses apoptosis induced by Fas
cross-linking. These results suggest that for apoptosis to proceed, the
transcriptional events promoting cell survival and proliferation, in
which SRF is involved, must first be inactivated.
Present address: Oxford Glycoscience, The Forum, Abingdon, Oxon
OX14 4RY, United Kingdom.
¶
To whom correspondence should be addressed: School of
Biomedical Sciences, University of Nottingham, Queen's Medical Centre, Nottingham NG7 2UH, UK. Tel.: 44-115-970-9362; Fax:
44-115-970-9926; E-mail: peter.shaw@nottingham.ac.uk.
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