A protein complex containing Tho2, Hpr1, Mft1 and a novel protein, Thp2, connects transcription elongation with mitotic recombination in Saccharomyces cerevisiae.
Transcription-induced recombination has been reported in all organisms from bacteria to mammals. We have shown previously that the yeast genes HPR1 and THO2 may be keys to the understanding of transcription-associated recombination, as they both affect transcription elongation and hyper-recombination in a concerted manner. Using a yeast strain that has the wild-type THO2 gene replaced by one encoding a His(6)-HA-tagged version, we have isolated an oligomeric complex containing four proteins: Tho2, Hpr1, Mft1 and a novel protein that we have named Thp2. We have reciprocally identified a complex containing Hpr1, Tho2 and Mft1 using anti-Mft1 antibodies in immunoprecipitation experiments. The protein complex is mainly nuclear; therefore, Tho2 and Hpr1 are physically associated. Like hpr1Delta and tho2Delta cells, mft1Delta and thp2Delta cells show mitotic hyper- recombination and impaired transcription elongation, in particular, through the bacterial lacZ sequence. Hyper-recombination conferred by mft1Delta and thp2Delta is only observed in DNA regions under transcription conditions. We propose that this protein complex acts as a functional unit connecting transcription elongation with the incidence of mitotic recombination.
Chávez
S
S
Departamento de Genética, Facultad de Biología, Avd. Reina Mercedes 6, Universidad de Sevilla, Sevilla 41012, Spain.
Beilharz
T
T
Rondón
A G
AG
Erdjument-Bromage
H
H
Tempst
P
P
Svejstrup
J Q
JQ
Lithgow
T
T
Aguilera
A
A
D000818:Animals; D001483:Base Sequence; D017931:DNA Primers / Q000235:genetics; D004268:DNA-Binding Proteins; D005656:Fungal Proteins / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism*; D015870:Gene Expression; D005800:Genes, Fungal; D046911:Macromolecular Substances; D008938:Mitosis; D009154:Mutation; D009687:Nuclear Proteins; D010641:Phenotype; D011995:Recombination, Genetic; D012441:Saccharomyces cerevisiae / Q000166:cytology / Q000235:genetics* / Q000378:metabolism*; D029701:Saccharomyces cerevisiae Proteins; D013347:Subcellular Fractions / Q000378:metabolism; D013696:Temperature; D014157:Transcription Factors / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D014158:Transcription, Genetic
D017931:DNA Primers; D004268:DNA-Binding Proteins; D005656:Fungal Proteins; C063494:HPR1 protein, S cerevisiae; D046911:Macromolecular Substances; D009687:Nuclear Proteins; D029701:Saccharomyces cerevisiae Proteins; C405934:THO2 protein, S cerevisiae; D014157:Transcription Factors; C068359:MFT1 protein, S cerevisiae