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Background During flow-mediated vasodilatation, nitric oxide activates guanylate cyclase and the resultant increase cGMP leads to an activation of PKGI. PKGI activates a number of targets in the smooth muscle cell that result in smooth muscle relaxation, including MLC phosphatase. MLC phosphatase isolated from smooth muscle is a holoenzyme consisting of three subunits; a 20 kDa subunit, a 38 kDa catalytic subunit and a myosin targeting subunit (MYPT1). MYPT1 has two isoforms that differ by the presence of a an alternatively spliced 31 bp 3' exon; exon inclusion codes for a MYPT1 that lacks a COOH-terminus leucine zipper (LZ-), while exon exclusion shifts the reading frame and codes for a LZ+ MYPT1 isoform.

cGMP effects on vascular tone: modulating the activity of myosin light chain phosphatase