>cd04128 Spg1 Spg1p. Spg1p (septum-promoting GTPase) was first identified in the fission yeast S. pombe, where it regulates septum formation in the septation initiation network (SIN) through the cdc7 protein kinase. Spg1p is an essential gene that localizes to the spindle pole bodies. When GTP-bound, it binds cdc7 and causes it to translocate to spindle poles. Sid4p (septation initiation defective) is required for localization of Spg1p to the spindle pole body, and the ability of Spg1p to promote septum formation from any point in the cell cycle depends on Sid4p. Spg1p is negatively regulated by Byr4 and cdc16, which form a two-component GTPase activating protein (GAP) for Spg1p. The existence of a SIN-related pathway in plants has been proposed. GTPase activating proteins (GAPs) interact with GTP-bound Rab and accelerate the hydrolysis of GTP to GDP. Guanine nucleotide exchange factors (GEFs) interact with GDP-bound Rabs to promote the formation of the GTP-bound state. Rabs are

Probab=98.43 E-value=4.5e-06 Score=57.74 Aligned_cols=112 Identities=17% Similarity=0.252 Sum_probs=72.6 Q ss_pred EEEECCCCCCHHHHHHHHHHHCCCCCCCCEECCCCEECCCHHHHHHHCCCEEEEEEEEEECCCCCCCEEEEEEECCCCCC Q ss_conf 99986878897789999999808732142201795613780889870853764079999607778713899981798755 Q gi|254780264|r 13 FGIMAHIDAGKTTTTERILYYAGKSHKIGEVHDGSATMDWMEQEQERGITITSASTTVFWPGRDGGQKKLTIIDTPGHVD 92 (701) Q Consensus 13 v~iiaHvd~GKTTL~d~LL~~~g~i~~~g~v~~g~~~~D~~~~E~eRgITi~ss~~sl~~~~~~~~~~~iNlIDTPGH~D 92 (701) T Consensus 3 ivlvGd~~VGKTsLi~rf~~--~~F~~~--------y~~------Tig~d~~~k--~i~v---~~~~v~l~iwDtaGqe~ 61 (182) T cd04128 3 IGLLGDAQIGKTSLMVKYVE--GEFDED--------YIQ------TLGVNFMEK--TISI---RGTEITFSIWDLGGQRE 61 (182) T ss_pred EEEECCCCCCHHHHHHHHHC--CCCCCC--------CCC------CCEEEEEEE--EEEE---CCEEEEEEEEECCCCHH T ss_conf 99999999898999999953--999999--------888------733898999--9999---99999999986776487 Q ss_pred CHHHHHHHHHHHCEEEEEEECCCCCCHHHHHHH-HHHHH--CCCCEEEEECCCCCC Q ss_conf 289999999860456999955888883479999-99987--399789998176765 Q gi|254780264|r 93 FTMEVERSIRVTDGAIALLDSNAGVEPQTETVW-RQADK--YSVPRVIFCNKMDKM 145 (701) Q Consensus 93 F~~Ev~~aL~~~DgailvVDa~eGv~~qT~~vl-r~~~~--~~lp~ilvINKiDr~ 145 (701) T Consensus 62 f~~~~~~y~~~a~~~ilvfDit~~~Sf~~~~~w~~~i~~~~~~~~~ilVGnK~DL~ 117 (182) T cd04128 62 FINMLPLVCNDAVAILFMFDLTRKSTLNSIKEWYRQARGFNKTAIPILVGTKYDLF 117 (182) T ss_pred HHHHHHHHHCCCCEEEEEEECCCHHHHHHHHHHHHHHHHHCCCCCEEEEEECCCCC T ss_conf 89999998647878999997899899998999999999768999889999866355

HHsearch alignment for GI: 254780264 and conserved domain: cd04128