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Polymerase-associated factor1(PAF1)complex is involved in histone methylation and transcriptional regulation.However,the mechanism by which protein,or complex,affects PAF1 complex accumulation are not well understood.Here,we provide insights into how the elongation factor Arabidopsis SPT5 recruits the PAF1 complex via the post-modification of proteins.SPT5 interacts with CDKD;2 kinase and is specifically phosphorylated by CDKD;2 at threonine.