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Supplemental Table I: Arabidopsis thaliana RAB GTPase interacting proteins Genes Name RabGDI AtRabGDI1 AGI Gened Accession Numbere AtRabGDI2 At3g59920 At2g44100 2446980 21360457 AtRabGDI3 At5g09550 15242440 AtREP1 At3g06540 20453227 RabGEF AtVPS9a At3g19770 18402362 AtVPS9b At5g09320 15242388 RabGAP AtGYPA1a At2g30710 13877620 AtGYPA1b At4g13730 15236337 AtGYPA1c At1g04830 15220331 AtGYPB1a At2g20440 15225355 AtGYPB1b At4g28550 15235345 AtGYPB1c At4g27100 15236983 AtGYPB1d At5g54780 15239749 AtGYPB1e At2g43490 15224288 AtGYPB1f At3g57590 15230342 AtGYPB2a At5g52590 15237206 AtGYPB2b At5g41940 15238237 AtGYPB2c At5g53570 15238777 AtGYPB2d At3g49350 15229125 AtGYPB2e At5g24390 15238518 AtGYPC1a At3g07890 18398086 AtGYPC1b At3g55020 21360505 AtGYPC1c At2g39280 15225062 AtGYPC1d At2g37290 15228114 AtGYPD1a At3g02460 18396193 AtGYPD1b At5g15930 15237222 Supplemental Table II: A. thaliana RCC1 motif containing proteins AGI Genea Accession numberb Putative Protein function / At5g63860 15237540 UV-B resistance protein UVR-8 d 5 At5g16040 15237253 UVB-resistance protein-like 3 At3g02300 15232881 Unknown 3 At1g65920 15218867 PARF-1 FYVE zinc finger domain containing protein, binds monophosphorylated 4 characteristics Number of RCC1 c phosphoinositide lipids motifs c e At5g19420 15239739 Regulator of chromosome condensation -like 3 At5g48330 15238941 Regulator of chromosome condensation -like 4 At5g60870 15239463 UV-B resistance protein UVR8-like protein 1 At3g47660 15228210 Unknown, contains a sugar transport signature 3 At4g14370 15236489 Disease resistance N-like protein, contains a ATP/GTP binding site motif A 2 At1g69710 15222423 Unknown, contains a cytochrome c family heme binding site signature 3 At3g53830 15232347 UV-B resistance protein UVR8-like protein 5 At3g26100 16323434 Unknown, contains a prokaryotic membrane lipoprotein lipid attachment site 1 At1g76950 18411298 Zinc finger protein PRAF-1 At3g55580 15233306 Regulator of chromosome condensation -like 4 At1g27060 15223423 Unknown, contains a prokaryotic membrane lipoprotein lipid attachment site 1 At1g19880 15223697 Unknown, contains a cytochrome c family heme binding site signature 3 At3g03790 15228636 Unknown, contains a ATP/GTP binding site motif A 1 f 3 (a) Arabidopsis Genome Initiative (AGI) gene nomenclature (b) Genbank protein accession no. (GI:) for a translation of the corresponding gene (c) Structural protein characteristics and number of RCC1 motifs were determined using Prosite (http://us.expasy.org/prosite/). (d) Kliebenstein et al., 2002 (e) Heras and Drobak, 2002 (f) Jensen et al., 2001 Supplemental Figure. The GTPase cycle and its regulators. Changes in protein conformation that occur upon GTP hydrolysis by small GTPases allow these regulatory proteins to act as molecular switches that control diverse biological functions in eukaryotic cells (Bourne et al., 1991; Hall, 1998). Physiological control of the GTPase cycle is exerted through interaction of the small GTPase protein either with guanine nucleotide exchange factors (GEFs), that “activate” GTPases by forcing release of GDP and exchange for GTP, or through interaction with GTPase activating proteins (GAPs), that “inactivate” GTPases by stimulating GTP hydrolysis. When in the “active” state, the small GTPases interact with “effector” proteins that carry out downstream events.