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The nicking homing endonuclease I-BasI is encoded by a group I intron in the DNA polymerase gene of the Bacillus thuringiensis phage Bastille

Item Type:Article
Title:The nicking homing endonuclease I-BasI is encoded by a group I intron in the DNA polymerase gene of the Bacillus thuringiensis phage Bastille
Creators Name:Landthaler, M. and Shub, D.A.
Abstract:Here we describe the discovery of a group I intron in the DNA polymerase gene of Bacillus thuringiensis phage Bastille. Although the intron insertion site is identical to that of the Bacillus subtilis phages SPO1 and SP82 introns, the Bastille intron differs from them substantially in primary and secondary structure. Like the SPO1 and SP82 introns, the Bastille intron encodes a nicking DNA endonuclease of the H-N-H family, I-BasI, with a cleavage site identical to that of the SPO1-encoded enzyme I-HmuI. Unlike I-HmuI, which nicks both intron-minus and intron-plus DNA, I-BasI cleaves only intron-minus alleles, which is a characteristic of typical homing endonucleases. Interestingly, the C-terminal portions of these H-N-H phage endonucleases contain a conserved sequence motif, the intron-encoded endonuclease repeat motif (IENR1) that also has been found in endonucleases of the GIY-YIG family, and which likely comprises a small DNA-binding module with a globular betabetaalphaalphabeta fold, suggestive of module shuffling between different homing endonuclease families.
Keywords:Amino Acid Sequence, Bacillus Thuringiensis, Bacteriophages, Base Sequence, Conserved Sequence, DNA Restriction Enzymes, DNA-Directed DNA Polymerase, Viral Genes, Introns, Molecular Sequence Data, Nucleic Acid Conformation, Viral RNA, Sequence Alignment
Source:Nucleic Acids Research
ISSN:0305-1048
Publisher:Oxford University Press (U.K.)
Volume:31
Number:12
Page Range:3071-3077
Date:15 June 2003
Official Publication:https://doi.org/10.1093/nar/gkg433
PubMed:View item in PubMed

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