TP53 phosphorylated on S15 increases the amount of CDKN1A. 2 / 2
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"Elevations in p53 expression and p53 Ser15 phosphorylation enhance p53 transcriptional activity, resulting in increased MKP-1 and p21 levels, and increased gene expression of Wip1, p21, and Cdkn2d (Cdk4 inhibitor)."

"Phosphorylation of p53 on S15 by ATM and ATR and/or on S20 by CHK1 and CHK2 stabilizes p53 protein XREF_BIBR - XREF_BIBR and up-regulates the expression of p21 (also known as CIP1 and WAF1), an inhibitor of cyclin E/cyclin dependent kinase 2 (CDK2) that controls G1/S progression."