P-loop containing Nucleoside Triphosphate Hydrolases; Members of the P-loop NTPase domain superfamily are characterized by a conserved nucleotide phosphate-binding motif, also referred to as the Walker A motif (GxxxxGK[S/T], where x is any residue), and the Walker B motif (hhhh[D/E], where h is a hydrophobic residue). The Walker A and B motifs bind the beta-gamma phosphate moiety of the bound nucleotide (typically ATP or GTP) and the Mg2+ cation, respectively. The P-loop NTPases are involved in diverse cellular functions, and they can be divided into two major structural classes: the KG (kinase-GTPase) class which includes Ras-like GTPases and its circularly permutated YlqF-like; and the ASCE (additional strand catalytic E) class which includes ATPase Binding Cassette (ABC), DExD/H-like helicases, 4Fe-4S iron sulfur cluster binding proteins of NifH family, RecA-like F1-ATPases, and ATPases Associated with a wide variety of Activities (AAA). Also included are a diverse set of nucleotide/nucleoside kinase families.

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                 ....*....|....*....|....*....|....*....|....*....|....
gi 342307111  49 KVMHEFQNRYCLFNNRASGAEKEEQKMQLLTLVQSMVRENGGRCFTNKMYESAE 102
Cdd:cd01852  147 RLLEKCGGRYVAFNNKAKGREQEQQVKELLAKVEEMVRENGGKPYTNEMYEEAE 200

AvrRpt2-Induced Gene 1 (AIG1); This group represents Arabidoposis protein AIG1 (avrRpt2-induced gene 1) that appears to be involved in plant resistance to bacteria. The Arabidopsis disease resistance gene RPS2 is involved in recognition of bacterial pathogens carrying the avirulence gene avrRpt2. AIG1 exhibits RPS2- and avrRpt1-dependent induction early after infection with Pseudomonas syringae carrying avrRpt2. This subfamily also includes IAN-4 protein, which has GTP-binding activity and shares sequence homology with a novel family of putative GTP-binding proteins: the immuno-associated nucleotide (IAN) family. The evolutionary conservation of the IAN family provides a unique example of a plant pathogen response gene conserved in animals. The IAN/IMAP subfamily has been proposed to regulate apoptosis in vertebrates and angiosperm plants, particularly in relation to cancer, diabetes, and infections. The human IAN genes were renamed GIMAP (GTPase of the immunity associated proteins).

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....
gi 342307111  49 KVMHEFQNRYCLFNNRASGAEKEEQKMQLLTLVQSMVRENGGRCFTNKMYESAE 102
Cdd:cd01852  147 RLLEKCGGRYVAFNNKAKGREQEQQVKELLAKVEEMVRENGGKPYTNEMYEEAE 200

Translocon at the Outer-envelope membrane of Chloroplasts 34-like (Toc34-like); The Toc34-like (Translocon at the Outer-envelope membrane of Chloroplasts) family contains several Toc proteins, including Toc34, Toc33, Toc120, Toc159, Toc86, Toc125, and Toc90. The Toc complex at the outer envelope membrane of chloroplasts is a molecular machine of ~500 kDa that contains a single Toc159 protein, four Toc75 molecules, and four or five copies of Toc34. Toc64 and Toc12 are associated with the translocon, but do not appear to be part of the core complex. The Toc translocon initiates the import of nuclear-encoded preproteins from the cytosol into the organelle. Toc34 and Toc159 are both GTPases, while Toc75 is a beta-barrel integral membrane protein. Toc159 is equally distributed between a soluble cytoplasmic form and a membrane-inserted form, suggesting that assembly of the Toc complex is dynamic. Toc34 and Toc75 act sequentially to mediate docking and insertion of Toc159 resulting in assembly of the functional translocon.

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                 ....*....|....*....|....*....|....*....|....*....|
gi 342307111   6 GGAGFIPESSRSSHEL--GNQDQGIPQLRIVLLGKTGAGKSSTGNKVMHE 53
Cdd:cd01853    5 GFQFFPDATQTKLHELeaKLKKELDFSLTILVLGKTGVGKSSTINSIFGE 54

AvrRpt2-Induced Gene 1 (AIG1); This group represents Arabidoposis protein AIG1 (avrRpt2-induced gene 1) that appears to be involved in plant resistance to bacteria. The Arabidopsis disease resistance gene RPS2 is involved in recognition of bacterial pathogens carrying the avirulence gene avrRpt2. AIG1 exhibits RPS2- and avrRpt1-dependent induction early after infection with Pseudomonas syringae carrying avrRpt2. This subfamily also includes IAN-4 protein, which has GTP-binding activity and shares sequence homology with a novel family of putative GTP-binding proteins: the immuno-associated nucleotide (IAN) family. The evolutionary conservation of the IAN family provides a unique example of a plant pathogen response gene conserved in animals. The IAN/IMAP subfamily has been proposed to regulate apoptosis in vertebrates and angiosperm plants, particularly in relation to cancer, diabetes, and infections. The human IAN genes were renamed GIMAP (GTPase of the immunity associated proteins).

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....
gi 342307111  49 KVMHEFQNRYCLFNNRASGAEKEEQKMQLLTLVQSMVRENGGRCFTNKMYESAE 102
Cdd:cd01852  147 RLLEKCGGRYVAFNNKAKGREQEQQVKELLAKVEEMVRENGGKPYTNEMYEEAE 200

Translocon at the Outer-envelope membrane of Chloroplasts 34-like (Toc34-like); The Toc34-like (Translocon at the Outer-envelope membrane of Chloroplasts) family contains several Toc proteins, including Toc34, Toc33, Toc120, Toc159, Toc86, Toc125, and Toc90. The Toc complex at the outer envelope membrane of chloroplasts is a molecular machine of ~500 kDa that contains a single Toc159 protein, four Toc75 molecules, and four or five copies of Toc34. Toc64 and Toc12 are associated with the translocon, but do not appear to be part of the core complex. The Toc translocon initiates the import of nuclear-encoded preproteins from the cytosol into the organelle. Toc34 and Toc159 are both GTPases, while Toc75 is a beta-barrel integral membrane protein. Toc159 is equally distributed between a soluble cytoplasmic form and a membrane-inserted form, suggesting that assembly of the Toc complex is dynamic. Toc34 and Toc75 act sequentially to mediate docking and insertion of Toc159 resulting in assembly of the functional translocon.

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|
gi 342307111   6 GGAGFIPESSRSSHEL--GNQDQGIPQLRIVLLGKTGAGKSSTGNKVMHE 53
Cdd:cd01853    5 GFQFFPDATQTKLHELeaKLKKELDFSLTILVLGKTGVGKSSTINSIFGE 54