>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=98.96 E-value=1.1e-08 Score=76.28 Aligned_cols=153 Identities=19% Similarity=0.216 Sum_probs=93.8 Q ss_pred EEEECCCCCCHHHHHHHHHHHCCCCCCCCCCCCEECCCCHHHHHCCCEEEEEEEEEEECCEEEEEECCCCCCCCHHHHHH Q ss_conf 99985468987788999999839614232200000388577987096064679999989979999728987540799999 Q gi|254780233|r 22 IAIIAHVDHGKTTLVDELLKQSGVFRDNQRVSERVMDCNDLEKERGITILAKVTSIVWNDVRINIVDTPGHADFGGEVER 101 (624) Q Consensus 22 iaIiaHvDhGKTTL~d~LL~~sG~~~~~~~v~~~vmD~~~~EreRGITI~a~~~~~~~~~~~iNiiDTPGH~DF~gEVer 101 (624) T Consensus 4 ivllGd~~VGKTsli~r~~~--~~F~~~y--~~Ti~~----------~-~~~~i~~~~~~~~l~iwDtaG~e~~~~l~~~ 68 (165) T cd04140 4 VVVFGAGGVGKSSLVLRFVK--GTFRESY--IPTIED----------T-YRQVISCSKNICTLQITDTTGSHQFPAMQRL 68 (165) T ss_pred EEEECCCCCCHHHHHHHHHH--CCCCCCC--CCCCCC----------E-EEEEEEECCEEEEEEEEECCCCCCCCCCHHH T ss_conf 99989999769999999964--9699986--884542----------0-5589999999999999989998465423244 Q ss_pred HHHHHCEEEEEEECCCCCCHH-HHHHHHHHHH------CCCCEEEEEECCCCCCCCHHHHHHHHHHHHHHCCCCHHHCCH Q ss_conf 987421789999768788647-8999999997------299789999754366740256899999888622673011042 Q gi|254780233|r 102 ILCMVESVVVLVDAAEGPMPQ-TKFVVGKALK------IGLRPIVVVNKVDRSDARADEVINEVFDLFSALDATDAQLDF 174 (624) Q Consensus 102 ~l~~~DgaiLvVdA~eGv~~Q-T~~vl~~A~~------~~l~~IvvINKiDr~~a~~~~v~~ei~dlf~~l~a~de~ld~ 174 (624) T Consensus 69 ~~~~a~~~ilvydit~~~Sf~~~~~~~~~i~~~~~~~~~~~piilVgNK~Dl~~~r~V-~~~e~~~~a~~-------~~~ 140 (165) T cd04140 69 SISKGHAFILVYSVTSKQSLEELKPIYELICEIKGNNIEKIPIMLVGNKCDESHKREV-SSNEGAACATE-------WNC 140 (165) T ss_pred HHCCCCEEEEEECCCCHHHHHHHHHHHHHHHHHHHCCCCCCCEEEEEECCCCCCCCCC-CHHHHHHHHHH-------CCC T ss_conf 5068857999813898789999999999999996158888878998642464002788-99999999998-------698 Q ss_pred HHHHHHHHCCEECCCCCCCCCCCCHHHHHHHHCC Q ss_conf 6688788659164674223348641355532102 Q gi|254780233|r 175 PILYGSGRFGWMSDSSDGSRDQGMVPLLNLIVDH 208 (624) Q Consensus 175 Pv~~~Sa~~G~~~~~~~~~~~~gl~~Lld~Ii~~ 208 (624) T Consensus 141 ~~~E~SAk~~-----------~nV~e~F~~l~~l 163 (165) T cd04140 141 AFMETSAKTN-----------HNVQELFQELLNL 163 (165) T ss_pred EEEEECCCCC-----------CCHHHHHHHHHHC T ss_conf 8999744779-----------4879999999814

HHsearch alignment for GI: 254780233 and conserved domain: cd04140