Temporary complementation of temperature-sensitive mutants of the cell cycle by transfection with a wild-type or a mutant cDNA of ADP/ATP translocase.
A number of cell-cycle-specific temperature-sensitive (ts) mutants have been isolated from animal cells, especially Syrian hamster cells. These ts mutants, like cell cycle ts mutants of yeast, can be complemented by specific genes, some of which have been molecularly cloned. We have isolated a cDNA clone that complements TK-ts13 cells, but only temporarily. This clone, called B1, differs from a previously isolated clone (Sekiguchi et al.: EMBO Journal 7:1683-1687, 1988) that specifically complements ts13 cells. In addition, B1 also complemented temporarily three other ts mutants of the cell cycle, tsAF8, ts694, and ts550C cells. These mutants have different mutations since, in cell fusion experiments, they complement each other. Sequencing of the B1 cDNA clone revealed that it was a mutant of human ADP/ATP translocase in which some human sequences at the 5' end have been replaced by SV40 sequences. The wild-type translocase was less effective but could still increase the survival time of cell cycle ts mutants at the restrictive temperature. Using the polymerase chain reaction, it was possible to demonstrate that the B1 plasmid is expressed in TK-ts13 cells undergoing temporary complementation.
Alder
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H
Department of Pathology, Temple University Medical School, Philadelphia, Pennsylvania 19140.
Chang
C D
CD
Chen
S T
ST
Beck
I
I
Chang
C Y
CY
Baserga
R
R
D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D002453:Cell Cycle; D006224:Cricetinae; D004247:DNA / Q000235:genetics; D005786:Gene Expression Regulation; D005816:Genetic Complementation Test; D000226:Mitochondrial ADP, ATP Translocases / Q000502:physiology*; D008969:Molecular Sequence Data; D009713:Nucleotidyltransferases / Q000502:physiology*; D012333:RNA, Messenger / Q000235:genetics; D014162:Transfection
D012333:RNA, Messenger; D004247:DNA; D000226:Mitochondrial ADP, ATP Translocases; D009713:Nucleotidyltransferases