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Fig. 1 | Mobile DNA

Fig. 1

From: The association of group IIB intron with integrons in hypersaline environments

Fig. 1

General secondary structure of group II intron RNA, attC site and domains of IEP. Group II intron is composed of 6 domains (DI-DVI) at which DI and DV form its catalytic core (a). Intron encoded protein (IEP) is encoded by ORF in DIV (A). The main domains of an IEP ORF (RT: reverse transcriptase, X: maturase and En: endonuclease are depicted in the schematic diagram of IEP (b). Recognition of target site occurs mainly via base-pairing between short sequences at 5′ exon (Intron binding sites IBS1 and 2) with exon binding sites (EBS1 and 2) on the intron and either IBS3 or δ’ on exon 3′ (based on intron class) with EBS3 or δ on the intron (a). In case of group IIC, IBS2 is replaced by a hairpin structure such as attC bottom strand (bs) in group IIC-attC (c) at which the intron is inserted at the R” sequence into the consensus sequence TTGT/T (IBS1/IBS3)

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