Primary Citation PubMed: 15994378
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Synapsis and catalysis by activated Tn3 resolvase mutants.
(2008) Nucleic Acids Res 36
PubMed: 19015124 | PubMedCentral: PMC2602789 | DOI: 10.1093/nar/gkn885
( B ) Crystal structure of a synaptic tetramer of γδ resolvase with two cleaved site Is [1ZR4; ( 16 )], and on the right the orange resolvase subunit in the same orientation, showing r... sidues in spacefill as in (A), except that the following residues are mutant; A2, K56, S101, Y102, I103, Q124.
The structures of the site I synaptic intermediates [1ZR2, 1ZR4, 2GM4; ( 16 , 17 )] and of an activated variant catalytic domain without DNA [2GM5; ( 17 )] contain a tetrameric arrangement of the catalytic domains which is not found in any of the structures of wild-type resolvase [2RSL, 1GDR, 1GDT; ( 6 , 8 , 9 , 11 )] ( Figure 2 B).
Publication Year: 2008
The Hin recombinase assembles a tetrameric protein swivel that exchanges DNA strands.
(2009) Nucleic Acids Res 37
PubMed: 19515933 | PubMedCentral: PMC2724282 | DOI: 10.1093/nar/gkp466
An asymmetric tetramer structure of the catalytic domain of γδ resolvase has also been reported (PDB code 2GM5) in which one synapsed pair of subunits is in an alternative conformation... from that of the DNA bound tetramers in 1ZR4/2GM4 ( 11 ).
Tetrameric Hin models bound to a cleaved synaptic complex were derived from the crystal structures of resolvase (PDB code 1ZR4) and of a resolvase-Hin chimera (PDB code 2GM4) in which Hin residues 96–105 were substituted in place of resolvase ( 10 , 11 ).
MATERIALS AND METHODS Molecular models of Hin Hin closed tetramer conformation models were generated based on the γδ resolvase tetramer X-ray structures 2GM4 (3.5 Å) and 1ZR4 (3.4 Å) ( 10 , 11 ).
Model tetramers were generated by superimposing (LSQMAN) the DNA bound subunits onto the respective 2GM4 and 1ZR4 tetramers.
The final tetramer models of 2GM4 and 1ZR4 have no residues in the generously allowed or disallowed regions of the Ramachandran plot.
The Hin subunit models were docked onto DNA by aligning with the respective 2GM4 (chain B) and 1ZR4 (chain A) template structures using LSQMAN.
Alignment of backbone atoms of the 1ZR4 Hin model and resolvase tetramer give an overall RMSD of 3.1 Å and an RMSD of 0.8–1.1 Å over respective peptide chains from residues 1–134.
PDB derived from the 1ZR4 γδ resolvase tetramer) secondary structure elements (β strands, black arrows; α-helices, grey rectangles) are denoted above and below the resolvase and Hin sequences, respectively.
Publication Year: 2009
Regulatory mutations in Sin recombinase support a structure-based model of the synaptosome.
(2009) Mol Microbiol 74
PubMed: 19508283 | PubMedCentral: PMC2764113 | DOI: 10.1111/j.1365-2958.2009.06756.x
This model is based on the crystal structure of the γδ resolvase site I synaptic tetramer (pdb: 1ZR4): residues 1–119 of each subunit in the γδ resolvase tetram... r were replaced by segments of the Sin crystal structure (2R0Q, chain D).
, 2008 ), γδ resolvase (pdb: 1ZR4; Li et al .
The catalytic residues of Tn3 resolvase.
PubMed: 19789272 | PubMedCentral: PMC2794168 | DOI: 10.1093/nar/gkp797
The second and third columns give the distance (Å) of the sidechain functional groups (nearest non-hydrogen atom) from the phosphorus atom of the scissile phosphate, in the two structures show... in Figure 2 B; the γδ resolvase dimer-site I structure 1GDT and the cleaved intermediate structure 1ZR4.
The E118 sidechains have moved apart in the structures of cleaved intermediates, e.g. 1ZR4, and are quite far from the scissile phosphates in all the structures, but they might be much closer to the DNA immediately prior to cleavage, and thus might have an accessory role in catalysis.
Right; crystal structure of a synaptic tetramer of a γδ resolvase activated mutant with two cleaved site Is [1ZR4 ( 22 ); smaller scale].
Structure analysis The following crystal structures which include serine recombinase catalytic domains are available: wild-type γδ resolvase [two structures, 2RSL and 1GDR, containing four structurally distinct subunits; ( 25–27 )]; a wild-type γδ resolvase dimer bound to site I DNA [1GDT; two distinct subunits; ( 24 )]; an activated mutant γδ resolvase N-terminal domain tetramer [2GM5; four distinct subunits; ( 23 )]; γδ resolvase mutants in synaptic complexes with cleaved site I DNA [three structures, with six distinct subunit forms; 1ZR2, 1ZR4 and 2GM4; ( 22 , 23 )]; a dimer of Sin recombinase bound to DNA [2R0Q; two distinct subunits ( 37 )]; the catalytic domain of TP901 integrase [3BVP; two distinct subunits ( 38 )]; the catalytic domain of a Clostridium recombinase [3G13; two distinct subunits ( 39 )]; and the catalytic domain of a Streptococcus recombinase [3GUV; one subunit ( 40 )].
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