FN Archimer Export Format PT J TI Structural insights into a new homodimeric self-activated GTPase family BT AF GRAS, S CHAUMONT, V FERNANDEZ, B CARPENTIER, P CHARRIER SAVOURNIN, F SCHMITT, Sophie PINEAU, C FLAMENT, Didier HECKER, A FORTERRE, P ARMENGAUD, J HOUSSET, D AS 1:1;2:2;3:2;4:1;5:2;6:3;7:4;8:3;9:5;10:5,6;11:2;12:1; FF 1:;2:;3:;4:;5:;6:PDG-DOP-DCB-BM-BMM;7:;8:PDG-DOP-DCB-EEP-LMEE;9:;10:;11:;12:; C1 Laboratoire de Cristallographie et Cristallogénèse des Protéines, Institut de Biologie Structurale J.-P. Ebel, CEA-CNRS-UJF, UMR 5075, 41, Rue Jules Horowitz, F-38027 Grenoble, France Inst Biol Environm & Biotechnol, Serv Biochim & Toxicol Nucl, Lab Biochim Syst Perturbes, Marcoule, Bagnols Ceze, France IFREMER, Lab Microbiol Environm Extremes, UMR6197, Ctr Brest, Plouzane, France. INSERM, U625, UPRES, JE 2459, Rennes, France. Univ Paris 11, CNRS, Inst Genet & Microbiol, UMR 8621, Orsay, France. Inst Pasteur, Dept Microbiol Fondamentale & Med, Lab Microbiol & Biotechnol Extremophiles, Paris, France. C2 CEA, FRANCE IBEB, FRANCE IFREMER, FRANCE INSERM, FRANCE UNIV PARIS 11, FRANCE INST PASTEUR, FRANCE SI BREST SE PDG-DOP-DCB-BM-BMM PDG-DOP-DCB-EEP-LMEE IN WOS Ifremer jusqu'en 2018 copubli-france copubli-univ-france IF 7.45 TC 40 UR https://archimer.ifremer.fr/doc/2007/publication-4724.pdf LA English DT Article DE ;Structure;SIMIBI;Replication;GTPase;Crystal AB The human XAB1/ MBDin GTPase and its close homologues form one of the ten phylogenetically distinct families of the SIMIBI ( after signal recognition particle, MinD and BioD) class of phosphate- binding loop NTPases. The genomic context and the partners identified for the archaeal and eukaryotic homologues indicate that they are involved in genome maintenance - DNA repair or replication. The crystal structure of PAB0955 from Pyrococcus abyssi shows that, unlike other SIMIBI class G proteins, these highly conserved GTPases are homodimeric, regardless of the presence of nucleotides. The nucleotide- binding site of PAB0955 is rather rigid and its conformation is closest to that of the activated SRP G domain. One insertion to the G domain bears a strictly conserved GPN motif, which is part of the catalytic site of the other monomer and stabilizes the phosphate ion formed. Owing to this unique functional feature, we propose to call this family as GPN- loop GTPase. PY 2007 PD JUL SO Embo reports SN 1469-221X PU Nature VL 8 IS 6 UT 000247026900014 BP 569 EP 575 DI 10.1038/sj.embor.7400958 ID 4724 ER EF