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• W2096289312 abstract "Two critical steps controlling serine recombinase activity are the remodeling of dimers into the chemically active synaptic tetramer and the regulation of subunit rotation during DNA exchange. We identify a set of hydrophobic residues within the oligomerization helix that controls these steps by the Hin DNA invertase. Phe105 and Met109 insert into hydrophobic pockets within the catalytic domain of the same subunit to stabilize the inactive dimer conformation. These rotate out of the catalytic domain in the dimer and into the subunit rotation interface of the tetramer. About half of residue 105 and 109 substitutions gain the ability to generate stable synaptic tetramers and/or promote DNA chemistry without activation by the Fis/enhancer element. Phe106 replaces Phe105 in the catalytic domain pocket to stabilize the tetramer conformation. Significantly, many of the residue 105 and 109 substitutions support subunit rotation but impair ligation, implying a defect in rotational pausing at the tetrameric conformer poised for ligation. We propose that a ratchet-like surface involving Phe105, Met109 and Leu112 within the rotation interface functions to gate the subunit rotation reaction. Hydrophobic residues are present in analogous positions in other serine recombinases and likely perform similar functions." @default.
• W2096289312 created "2016-06-24" @default.
• W2096289312 creator A5021981216 @default.
• W2096289312 creator A5076702397 @default.
• W2096289312 date "2015-06-08" @default.
• W2096289312 modified "2023-09-30" @default.
• W2096289312 title "Controlling tetramer formation, subunit rotation and DNA ligation during Hin-catalyzed DNA inversion" @default.
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• W2096289312 doi "https://doi.org/10.1093/nar/gkv565" @default.
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