Abstract:
:Succinate-ubiquinone reductase (complex II) is an important enzyme complex in aerobic respiration and the tricarboxylic acid cycle. We recently identified two distinct cDNAs for the human flavoprotein subunit (Fp) from a single individual and demonstrated mRNAs of these two isoforms, Type I Fp and Type II Fp, in skeletal muscle, liver, brain, heart, and kidney. Type I Fp was expressed at higher levels than Type II Fp in all cases. In the present study, the biochemical properties of Type II Fp-containing complex II in Raji cells predominantly expressing Type II Fp were investigated. Complex II having Type II Fp was separated from that having Type I Fp by isoelectric focusing in the presence of sucrose monolaurate. Together with the fact that succinate-ubiquinone reductase activity of mitochondria prepared from Raji cell was almost identical to that from human liver, these results clearly indicate the presence of two distinct isoforms of active complex II in human mitochondria.
journal_name
Biochem Biophys Res Communjournal_title
Biochemical and biophysical research communicationsauthors
Tomitsuka E,Goto Y,Taniwaki M,Kita Kdoi
10.1016/j.bbrc.2003.10.065subject
Has Abstractpub_date
2003-11-21 00:00:00pages
774-9issue
3eissn
0006-291Xissn
1090-2104pii
S0006291X03021648journal_volume
311pub_type
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