>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=99.64 E-value=1.7e-15 Score=113.84 Aligned_cols=155 Identities=15% Similarity=0.223 Sum_probs=109.6 Q ss_pred EEEEECCCCCCCEEEEEECCCCCHHHHHHHCCCEECC--EEEEECCE--EEEEECCCCCCCCCCCCCCCHHHH--H--HH Q ss_conf 1244216777530354101454012121100000010--26632986--899822642124731167751234--4--33 Q gi|254780648|r 162 IGIIGLPNAGKSTFLASVTRAKPKIADYPFTTLYPNL--GIVKEGYK--EFILADIPGIIKNAHQGAGIGDRF--L--KH 233 (335) Q Consensus 162 VglVG~PNaGKSTLln~ls~ak~kIa~ypFTT~~P~l--Gvv~~~~~--~~~i~D~PGlIegA~~~~glG~~F--L--rh 233 (335) T Consensus 3 ivlvGd~~VGKTsLi~rf~~~~F-~~~y~-~Tig~d~~~k~i~v~~~~v~l~iwDtaGq-----------e~f~~~~~~y 69 (182) T cd04128 3 IGLLGDAQIGKTSLMVKYVEGEF-DEDYI-QTLGVNFMEKTISIRGTEITFSIWDLGGQ-----------REFINMLPLV 69 (182) T ss_pred EEEECCCCCCHHHHHHHHHCCCC-CCCCC-CCCEEEEEEEEEEECCEEEEEEEEECCCC-----------HHHHHHHHHH T ss_conf 99999999898999999953999-99988-87338989999999999999999867764-----------8789999998 Q ss_pred HHHHHHHHHHCCCCCCCHHHHHHHHHHHHHHHHHHHCCCCEEEEEECCCCCCH------HHHHHHHHHHHHHCCCCEEEE Q ss_conf 33357887520222211013466678998777667505988999974658998------899999999998629948999 Q gi|254780648|r 234 TERTHVLLHIVSALEENVQAAYQCILDELSAYNSELRKKIEIVGLSQIDTVDS------DTLARKKNELATQCGQVPFEF 307 (335) Q Consensus 234 Ier~~vLl~VVD~s~~d~~~~~~~I~~EL~~y~~~L~~Kp~IIVlNKiDl~~~------e~~~~~~~~l~~~~~~~vi~I 307 (335) T Consensus 70 ~~~a~~~ilvfDit~~~Sf~~~~~w~~~i~~~~~---~~~~ilVGnK~DL~~~~~~~~~~~~~~~~~~~a~~~~~~f~et 146 (182) T cd04128 70 CNDAVAILFMFDLTRKSTLNSIKEWYRQARGFNK---TAIPILVGTKYDLFADLPPEEQEEITKQARKYAKAMKAPLIFC 146 (182) T ss_pred HCCCCEEEEEEECCCHHHHHHHHHHHHHHHHHCC---CCCEEEEEECCCCCCCCCCHHEEHHHHHHHHHHHHCCCEEEEE T ss_conf 6478789999978998999989999999997689---9988999986635565562231024899999999849989999 Q ss_pred ECCCCCCHHHHHHHHHHHHHHHHHH Q ss_conf 8887889999999999999854523 Q gi|254780648|r 308 SSITGHGIPQILECLHDKIFSIRGE 332 (335) Q Consensus 308 SA~tg~GI~eL~~~I~e~L~~~r~e 332 (335) T Consensus 147 SAk~~~nV~e~F~~i~~~i~~~~~~ 171 (182) T cd04128 147 STSHSINVQKIFKIVLAKAFDLPLT 171 (182) T ss_pred ECCCCCCHHHHHHHHHHHHHCCCCC T ss_conf 4799979899999999999668997

HHsearch alignment for GI: 254780648 and conserved domain: cd04128