Structural insights into a new homodimeric self-activated GTPase family.

Abstract:

: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.

journal_name

EMBO Rep

journal_title

EMBO reports

authors

Gras S,Chaumont V,Fernandez B,Carpentier P,Charrier-Savournin F,Schmitt S,Pineau C,Flament D,Hecker A,Forterre P,Armengaud J,Housset D

doi

10.1038/sj.embor.7400958

subject

Has Abstract

pub_date

2007-06-01 00:00:00

pages

569-75

issue

6

eissn

1469-221X

issn

1469-3178

pii

7400958

journal_volume

8

pub_type

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