>cd04140 ARHI_like ARHI subfamily. ARHI (A Ras homolog member I) is a member of the Ras family with several unique structural and functional properties. ARHI is expressed in normal human ovarian and breast tissue, but its expression is decreased or eliminated in breast and ovarian cancer. ARHI contains an N-terminal extension of 34 residues (human) that is required to retain its tumor suppressive activity. Unlike most other Ras family members, ARHI is maintained in the constitutively active (GTP-bound) state in resting cells and has modest GTPase activity. ARHI inhibits STAT3 (signal transducers and activators of transcription 3), a latent transcription factor whose abnormal activation plays a critical role in oncogenesis. Most Ras proteins contain a lipid modification site at the C-terminus, with a typical sequence motif CaaX, where a = an aliphatic amino acid and X = any amino acid. Lipid binding is essential for membrane attachment, a key feature of most Ras proteins. Due to

Probab=98.63 E-value=8.6e-08 Score=67.38 Aligned_cols=151 Identities=18% Similarity=0.132 Sum_probs=85.5 Q ss_pred EEEEEEECCCCCHHHHHHHHHHHHHHHHHCCCCCCCCHHHHHCCCEEEEEEE-EEECCC--EEEEEEECCCCHHHHHHHH Q ss_conf 7999990468988789999998764442001312686869862920637899-982199--0899984787302467798 Q gi|254780263|r 13 LGLSTIGHVDHGKTTLTAAITKYYSEEKKEYGDIDSAPEEKLRGITIATAHV-SYETDK--RFYSHIDCPGHADYVKNMI 89 (392) Q Consensus 13 ~ni~~iGhvd~GKSTL~~~L~~~~~~~~~~~~~~D~~~~E~~rGiTi~~~~~-~~~~~~--~~i~iiD~PGH~~f~~~mi 89 (392) T Consensus 2 ~KivllGd~~VGKTsli~r~~~~~------------F~~~--y~~Ti~~~~~~~i~~~~~~~~l~iwDtaG~e~~~~l~~ 67 (165) T cd04140 2 YRVVVFGAGGVGKSSLVLRFVKGT------------FRES--YIPTIEDTYRQVISCSKNICTLQITDTTGSHQFPAMQR 67 (165) T ss_pred EEEEEECCCCCCHHHHHHHHHHCC------------CCCC--CCCCCCCEEEEEEEECCEEEEEEEEECCCCCCCCCCHH T ss_conf 099998999976999999996496------------9998--68845420558999999999999998999846542324 Q ss_pred HHHHCCCCEEEEECCCCCCC-CCHHHHHHHHHH------CCCCCEEEEECCCCCCCCHHHHHHCCCCCCEEEEEEEEEEE Q ss_conf 77400233145201234433-210677888863------18760233100233356122211012321001110145322 Q gi|254780263|r 90 TGATQADGAILVCAAEDGPK-PQTREHILLARQ------IGISSIVVYMNKVDAVDDDELLDISEYEIRDLLKEHKYSDD 162 (392) Q Consensus 90 ~g~~~~D~ailvVda~~G~~-~QT~eh~~l~~~------lgi~~iIv~iNKmD~v~~~~~~~~i~~~i~~~l~~~~~~~~ 162 (392) T Consensus 68 ~~~~~a~~~ilvydit~~~Sf~~~~~~~~~i~~~~~~~~~~~p-iilVgNK~Dl~~~r~---V~~~e~~~~a~~~----~ 139 (165) T cd04140 68 LSISKGHAFILVYSVTSKQSLEELKPIYELICEIKGNNIEKIP-IMLVGNKCDESHKRE---VSSNEGAACATEW----N 139 (165) T ss_pred HHHCCCCEEEEEECCCCHHHHHHHHHHHHHHHHHHHCCCCCCC-EEEEEECCCCCCCCC---CCHHHHHHHHHHC----C T ss_conf 4506885799981389878999999999999999615888887-899864246400278---8999999999986----9 Q ss_pred EECCCCEEEEEEECCCCCCCCCCCCCHHHHHHC Q ss_conf 102331146764114445652123320344310 Q gi|254780263|r 163 TPIIRGSALCALQGTNKELGEDSIHALMKAVDT 195 (392) Q Consensus 163 ~pii~~sa~~g~~~~n~~~~~~~~~~Ll~~i~~ 195 (392) T Consensus 140 ~~~~E~SAk~~~n----------V~e~F~~l~~ 162 (165) T cd04140 140 CAFMETSAKTNHN----------VQELFQELLN 162 (165) T ss_pred CEEEEECCCCCCC----------HHHHHHHHHH T ss_conf 8899974477948----------7999999981

HHsearch alignment for GI: 254780263 and conserved domain: cd04140