Cryo-EM structure of the IS621 recombinase in complex with bridge RNA, donor DNA, and target DNA in the post-strand exchange state (Holliday junction intermediate)

Structural mechanism of bridge RNA-guided recombination.

The IS621 recombinase in complex with bridge RNA, donor DNA, and target DNA in the post-strand exchange state (Holliday junction intermediate)

The linkage between 20I and 21I has been cleaved by IS621.

GPMEHELHYIGIDTAKEKLDVDVLRPDGRHRTKKFANTTKGHDELVSWLKGHKIDHAHICIEATGTYMEPVAECLYDAGY
IVSVINPALGKAFAQSEGLRNKTDTVDARMLAEFCRQKRPAAWEAPHPLERALRALVVRHQALTDMHTQELNRTETAREV
QRPSIDAHLLWLEAELKRLEKQIKDLTDDDPDMKHRRKLLESIPGIGEKTSAVLLAYIGLKDRFAHARQFAAFAGLTPRR
YESGSSVRGASRMSKAGHVSLRRALYMPAMVATSKTEWGRAFRDRLAANGKKGKVILGAMMRKLAQVAYGVLKSGVPFDA
SRHNPVAA

GGGAGUGCAGAGAAAAUCGGCCAGUUUUCUCUGCCUGCAGUCCGCAUGCCGUAUCGGGCCUUGGGUUCUAACCUGUUCUG
UAGAUUUAUGCAGCGGACUGCCUUUCUCCCAAAGUGAUAAACCGGACAGUAUCAUGGACCGGUUUUCCCGGUAAUCCGUA
UUUACAAGGCUGGUUUCACU

(DG)(DC)(DC)(DG)(DG)(DG)(DT)(DA)(DA)(DT)(DA)(DC)(DC)(DA)(DC)(DC)(DA)(DA)(DG)(DC)
(DC)(DG)(DC)(DC)(DT)(DT)(DG)(DT)(DA)(DT)(DT)(DA)(DT)(DC)(DC)(DC)(DT)(DC)(DC)(DA)
(DG)(DT)(DG)(DC)(DA)(DG)(DA)(DG)(DA)

(DC)(DG)(DA)(DG)(DC)(DT)(DC)(DA)(DT)(DC)(DT)(DG)(DT)(DA)(DG)(DG)(DC)(DC)(DC)(DG)
(DA)(DT)(DG)(DG)(DT)(DG)(DG)(DT)(DA)(DT)(DT)(DA)(DC)(DC)(DC)(DG)(DG)(DC)

(DT)(DG)(DC)(DA)(DG)(DG)(DC)(DC)(DA)(DT)(DA)(DA)(DG)(DT)(DC)(DA)(DA)(DT)(DC)(DT)
(DA)(DC)(DA)(DG)(DA)(DT)(DG)(DA)(DG)(DC)(DT)(DC)(DG)

(DT)(DC)(DT)(DC)(DT)(DG)(DC)(DA)(DC)(DT)(DG)(DG)(DA)(DG)(DG)(DG)(DA)(DT)(DA)(DA)
(DT)(DA)(DC)(DA)(DA)(DG)(DA)(DT)(DA)(DC)(DT)(DG)(DT)(DT)(DA)(DT)(DG)(DG)(DC)(DC)
(DT)(DG)(DC)(DA)

Holliday junction, RNA dependent recombinase, RECOMBINATION-RNA-DNA COMPLEX

MEHELHYIGIDTAKEKLDVDVLRPDGRHRTKKFANTTKGHDELVSWLKGHKIDHAHICIEATGTYMEPVAECLYDAGYIV
SVINPALGKAFAQSEGLRNKTDTVDARMLAEFCRQKRPAAWEAPHPLERALRALVVRHQALTDMHTQELNRTETAREVQR
PSIDAHLLWLEAELKRLEKQIKDLTDDDPDMKHRRKLLESIPGIGEKTSAVLLAYIGLKDRFAHARQFAAFAGLTPRRYE
SGSSVRGASRMSKAGHVSLRRALYMPAMVATSKTEWGRAFRDRLAANGKKGKVILGAMMRKLAQVAYGVLKSGVPFDASR
HNPVAA