Caution:Has been termed RASSF3 by Ref.3.,Function:Potential tumor suppressor. Seems to be involved in lymphocyte adhesion by linking RAP1A activation upon T cell receptor or chemokine stimulation to integrin activation. Isoform 2 stimulates lymphocyte polarization and the patch-like distribution of ITGAL/LFA-1, resulting in an enhanced adhesion to ICAM1. Together with RAP1A may participate in regulation of microtubule growth. The association of isoform 2 with activated RAP1A is required for directional movement of endothelial cells during wound healing. May be involved in regulation of Ras apoptotic function. The RASSF5-STK4 complex may mediate HRAS1 and KRAS induced apoptosis.,similarity:Contains 1 phorbol-ester/DAG-type zinc finger.,similarity:Contains 1 Ras-associating domain.,similarity:Contains 1 SARAH domain.,subcellular location:Isoform 2 is mainly located in the perinuclear region of unstimulated primary T cells. Upon stimulation translocates to the leading edge and colocalizes with ITGAL/LFA-1 in the peripheral zone of the immunological synapse. Isoform 2 is localized to growing microtubules in vascular endothelial cells and is dissociated from microtubules by activated RAP1A.,subunit:Interacts directly with activated HRAS1; a RASSF5-STK4 complex probably associates with activated HRAS1. Interacts with KRAS. Probably interacts with Ras-like GTPases RRAS, RRAS2, MRAS, RAP1B, RAP2A and RALA. Can self-associate. Interacts with RSSF1 isoform A. The RSSF1 isoform A-RSSF5 heterodimer probably mediates the association of RSSF1 with HRAS1 (By similarity). Isoform 2 interacts with activated RAP1A and ITGAL/LFA-1. Binds STK4/MST1, inhibiting STK4 autoactivation.,tissue specificity:Widely expressed. Frequently down-regulated in lung tumor cell lines and primary lung tumors.,
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