Assertion: serine | /r/HasProperty | his-myodsp2
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text: We found that the purified His-MyoD mutant carrying the substitution of serine 37 (His-MyoDsp2) could not be phosphorylated by cdk9 (Figure 1a), indicating the phosphorylation of this residue as the possible signal enabling cdk9 to transactivate MyoD. To explore this possibility, we decided to compare the transcriptional activity of MyoDsp2 with two other point mutants carrying a mutation on sp sites targeted by cdk1 and cdk2, serine 5 (MyoDsp1) and serine 200 (MyoDsp3).