>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=98.84 E-value=1.1e-08 Score=72.94 Aligned_cols=149 Identities=16% Similarity=0.155 Sum_probs=81.6 Q ss_pred EEEEEEECCCCCHHHHHHHHHHHHHHHHHCCCCCCCCHHHHHCCCEEEEEEEEEECCCEEEEEEECCCCHHHHHHHHHHH Q ss_conf 79999904689887899999987644420013126868698629206378999821990899984787302467798774 Q gi|254780150|r 13 LGLSTIGHVDHGKTTLTAAITKYYSEEKKEYGDIDSAPEEKLRGITIATAHVSYETDKRFYSHIDCPGHADYVKNMITGA 92 (392) Q Consensus 13 ~ni~~iGhvd~GKSTL~~~L~~~~~~~~~~~~~~D~~~~E~~rGiTi~~~~~~~~~~~~~i~iiD~PGH~~f~~~mi~g~ 92 (392) T Consensus 1 iKivlvGd~~VGKTsLi~rf~~~~--------F~~~--y~~Tig~d~~~k~i~v~~~~v~l~iwDtaGqe~f~~~~~~y~ 70 (182) T cd04128 1 LKIGLLGDAQIGKTSLMVKYVEGE--------FDED--YIQTLGVNFMEKTISIRGTEITFSIWDLGGQREFINMLPLVC 70 (182) T ss_pred CEEEEECCCCCCHHHHHHHHHCCC--------CCCC--CCCCCEEEEEEEEEEECCEEEEEEEEECCCCHHHHHHHHHHH T ss_conf 989999999989899999995399--------9999--888733898999999999999999986776487899999986 Q ss_pred HCCCCEEEEECCCCCCC-CCHHHHHHHHHHC-CCCCEEEEECCCCCCCCH--HHHHHCCCCCCEEEEEEEEEEEEECCCC Q ss_conf 00233145201234433-2106778888631-876023310023335612--2211012321001110145322102331 Q gi|254780150|r 93 TQADGAILVCAAEDGPK-PQTREHILLARQI-GISSIVVYMNKVDAVDDD--ELLDISEYEIRDLLKEHKYSDDTPIIRG 168 (392) Q Consensus 93 ~~~D~ailvVda~~G~~-~QT~eh~~l~~~l-gi~~iIv~iNKmD~v~~~--~~~~~i~~~i~~~l~~~~~~~~~pii~~ 168 (392) T Consensus 71 ~~a~~~ilvfDit~~~Sf~~~~~w~~~i~~~~~~~~~ilVGnK~DL~~~~~~~~~~~~~~~~~~~a~~~----~~~f~et 146 (182) T cd04128 71 NDAVAILFMFDLTRKSTLNSIKEWYRQARGFNKTAIPILVGTKYDLFADLPPEEQEEITKQARKYAKAM----KAPLIFC 146 (182) T ss_pred CCCCEEEEEEECCCHHHHHHHHHHHHHHHHHCCCCCEEEEEECCCCCCCCCCHHEEHHHHHHHHHHHHC----CCEEEEE T ss_conf 478789999978998999989999999997689998899998663556556223102489999999984----9989999 Q ss_pred EEEEEEE Q ss_conf 1467641 Q gi|254780150|r 169 SALCALQ 175 (392) Q Consensus 169 sa~~g~~ 175 (392) T Consensus 147 SAk~~~n 153 (182) T cd04128 147 STSHSIN 153 (182) T ss_pred ECCCCCC T ss_conf 4799979

HHsearch alignment for GI: 254780150 and conserved domain: cd04128