alexa The SARAH Domain of RASSF1A and Its Tumor Suppressor Function.


Clinical & Medical Biochemistry

Author(s): Dittfeld C, Richter AM, Steinmann K, KlaggeUlonska A, Dammann RH

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Abstract The Ras association domain family 1A (RASSF1A) tumor suppressor encodes a Sav-RASSF-Hpo domain (SARAH), which is an interaction domain characterized by hWW45 (dSAV) and MST1/2 (dHpo). In our study, the interaction between RASSF1A and RASSF1C with MST1 and MST2 was demonstrated and it was shown that this interaction depends on the SARAH domain. SARAH domain-deleted RASSF1A had a similar growth-reducing effect as full-length RASSF1A and inhibited anchorage independent growth of the lung cancer cell lines A549 significantly. In cancer cells expressing the SARAH deleted form of RASSF1A, reduced mitotic rates (P = 0.001) with abnormal metaphases (P < 0.001) were observed and a significantly increased rate of apoptosis was found (P = 0.006) compared to full-length RASSF1A. Although the association with microtubules and their stabilization was unaffected, mitotic spindle formation was altered by deletion of the SARAH domain of RASSF1A. In summary, our results suggest that the SARAH domain plays an important role in regulating the function of RASSF1A.
This article was published in Mol Biol Int and referenced in Clinical & Medical Biochemistry

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