>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=99.14 E-value=1e-09 Score=83.02 Aligned_cols=153 Identities=16% Similarity=0.256 Sum_probs=101.4 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 3 ivlvGd~~VGKTsLi~rf~--~~~F~~~y~~------------Tig~d~~~k~i~v~~~~v~l~iwDtaGqe~f~~~~~~ 68 (182) T cd04128 3 IGLLGDAQIGKTSLMVKYV--EGEFDEDYIQ------------TLGVNFMEKTISIRGTEITFSIWDLGGQREFINMLPL 68 (182) T ss_pred EEEECCCCCCHHHHHHHHH--CCCCCCCCCC------------CCEEEEEEEEEEECCEEEEEEEEECCCCHHHHHHHHH T ss_conf 9999999989899999995--3999999888------------7338989999999999999999867764878999999 Q ss_pred HHHHHCEEEEEEECCCCCCHHHH---HHHHHHH-H--CCCCEEEEEECCCCCCC----CHHHHHHHHHHHHHHCCCCHHH Q ss_conf 98742178999976878864789---9999999-7--29978999975436674----0256899999888622673011 Q gi|254780233|r 102 ILCMVESVVVLVDAAEGPMPQTK---FVVGKAL-K--IGLRPIVVVNKVDRSDA----RADEVINEVFDLFSALDATDAQ 171 (624) Q Consensus 102 ~l~~~DgaiLvVdA~eGv~~QT~---~vl~~A~-~--~~l~~IvvINKiDr~~a----~~~~v~~ei~dlf~~l~a~de~ 171 (624) T Consensus 69 y~~~a~~~ilvfDit~~---~Sf~~~~~w~~~i~~~~~~~~~ilVGnK~DL~~~~~~~~~~~~~~~~~~~a-------~~ 138 (182) T cd04128 69 VCNDAVAILFMFDLTRK---STLNSIKEWYRQARGFNKTAIPILVGTKYDLFADLPPEEQEEITKQARKYA-------KA 138 (182) T ss_pred HHCCCCEEEEEEECCCH---HHHHHHHHHHHHHHHHCCCCCEEEEEECCCCCCCCCCHHEEHHHHHHHHHH-------HH T ss_conf 86478789999978998---999989999999997689998899998663556556223102489999999-------98 Q ss_pred CCHHHHHHHHHCCEECCCCCCCCCCCCHHHHHHHHCCC Q ss_conf 04266887886591646742233486413555321024 Q gi|254780233|r 172 LDFPILYGSGRFGWMSDSSDGSRDQGMVPLLNLIVDHV 209 (624) Q Consensus 172 ld~Pv~~~Sa~~G~~~~~~~~~~~~gl~~Lld~Ii~~i 209 (624) T Consensus 139 ~~~~f~etSAk~~-----------~nV~e~F~~i~~~i 165 (182) T cd04128 139 MKAPLIFCSTSHS-----------INVQKIFKIVLAKA 165 (182) T ss_pred CCCEEEEEECCCC-----------CCHHHHHHHHHHHH T ss_conf 4998999947999-----------79899999999999

HHsearch alignment for GI: 254780233 and conserved domain: cd04128