简介内容:S3 Fragment is a biologically active peptide featuring the amino-terminal phosphorylation site unique to Xenopus ADF/cofilin, which is the target of LIM kinase (LIMK) phosphorylation. LIMK1, a pivotal regulator of the actin cytoskeleton, phosphorylates ADF/cofilin at serine-3, leading to its inactivation. As a segment of the S3 peptide harboring the serine-3 sequence, this fragment serves as a widely recognized competitive inhibitor of LIMK1.