>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=99.43 E-value=1.2e-11 Score=97.75 Aligned_cols=157 Identities=14% Similarity=0.217 Sum_probs=102.0 Q ss_pred EEEECCCCCCHHHHHHHHHHHCCCCCCCCCCCEEECCCHHHHHHCCEEEEEEEEEEEECCCCCEEEEEEEECCCCCHHHH Q ss_conf 99980138987788999999829805444431130586779871950523279999743788438999961787300279 Q gi|254780321|r 14 FSIVAHIDHGKSTLADRFIQHCRGLTEREMSSQVLDNMDIERERGITIKAQTVRLNYTSTDAKDYQLNLIDTPGHVDFTY 93 (606) Q Consensus 14 ~~IiaHvDhGKTTL~d~lL~~tg~i~~~~~~~~vlD~~~~EreRGITIka~~~~~~~~~~~~~~y~iNlIDTPGH~DF~~ 93 (606) T Consensus 3 ivlvGd~~VGKTsLi~rf~--~~~F~~~y~~-----------Tig~d~~~k~i~-----v~~~~v~l~iwDtaGqe~f~~ 64 (182) T cd04128 3 IGLLGDAQIGKTSLMVKYV--EGEFDEDYIQ-----------TLGVNFMEKTIS-----IRGTEITFSIWDLGGQREFIN 64 (182) T ss_pred EEEECCCCCCHHHHHHHHH--CCCCCCCCCC-----------CCEEEEEEEEEE-----ECCEEEEEEEEECCCCHHHHH T ss_conf 9999999989899999995--3999999888-----------733898999999-----999999999986776487899 Q ss_pred HHHHHHHHCCEEEEEEECCCCCCHHHHHHHHH-HHHC--CCCEEEEECCCCCCCC----CCCCHHHHHHHHHHHHHHHHH Q ss_conf 99999973026899998687886558999999-9970--9967998326788753----211338887755532232100 Q gi|254780321|r 94 EVSRSLSACEGSLLVVDATQGVEAQTLANVYQ-AIDN--NHEIITVLNKADLPSA----DPDRVKKQIEETIGISTEDAL 166 (606) Q Consensus 94 EV~r~l~a~dgaiLvVdA~~Gvq~QT~~~~~~-A~~~--~l~~I~viNKiD~~~A----~~e~v~~ei~~~~g~~~~~ii 166 (606) T Consensus 65 ~~~~y~~~a~~~ilvfDit~~~Sf~~~~~w~~~i~~~~~~~~~ilVGnK~DL~~~~~~~~~~~~~~~~~~~a~~~~~~f~ 144 (182) T cd04128 65 MLPLVCNDAVAILFMFDLTRKSTLNSIKEWYRQARGFNKTAIPILVGTKYDLFADLPPEEQEEITKQARKYAKAMKAPLI 144 (182) T ss_pred HHHHHHCCCCEEEEEEECCCHHHHHHHHHHHHHHHHHCCCCCEEEEEECCCCCCCCCCHHEEHHHHHHHHHHHHCCCEEE T ss_conf 99998647878999997899899998999999999768999889999866355655622310248999999998499899 Q ss_pred HHHHHCCCCCCHHHHHHHHHHH Q ss_conf 0111002232006787763210 Q gi|254780321|r 167 LVSAKTGEGIPLLLERIVQQLP 188 (606) Q Consensus 167 ~vSAktG~GV~~LLd~Iv~~iP 188 (606) T Consensus 145 etSAk~~~nV~e~F~~i~~~i~ 166 (182) T cd04128 145 FCSTSHSINVQKIFKIVLAKAF 166 (182) T ss_pred EEECCCCCCHHHHHHHHHHHHH T ss_conf 9947999798999999999996

HHsearch alignment for GI: 254780321 and conserved domain: cd04128