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Table 1 Group I introns in bacteria and phage that encode homing endonuclease genes (HEGs)

From: Cyanobacterial ribosomal RNA genes with multiple, endonuclease-encoding group I introns

HEG family

Organisma

Taxonomyb

Genec

rDNA insertion sited

Intron size (nt)

HE size (aa) e

Functional HEsf

Accession number

LAGLIDADG

        
 

* Synechococcus sp. C9

Cyanobacteria

LSU

L1917

743

181

 

DQ421380

 

Thermotoga subterranea

Thermotogae

LSU

L1917

774

168

 

AJ556793

 

Simkania negevensis

Chlamydiae

LSU

L1931

654

143

 

U68460

 

* Synechococcus lividus (strain C1)

Cyanobacteria

LSU

L1931

675

162

 

DQ421379

 

* Synechococcus sp. C9

Cyanobacteria

LSU

L1931

666

167

 

DQ421380

 

Thermotoga naphthophila

Thermotogae

LSU

L1931

699

162

 

AJ556785

 

Thermotoga neapolitana

Thermotogae

LSU

L1931

700

162

 

AJ556784

 

Thermotoga petrophila

Thermotogae

LSU

L1931

698

162

 

AJ556786

 

Coxiella burnetii

Proteobacteria

LSU

L1951

720

157

 

AE016828

 

* Synechococcus lividus (strain C1)

Cyanobacteria

LSU

L2593

744

189

 

DQ421379

 

* Synechococcus sp. C9

Cyanobacteria

LSU

L2593

748

159

 

DQ421380

 

Thermosynechococcus elongatus

Cyanobacteria

LSU

L2593

745

175

 

AP005376

GIY-YIG

        
 

Escherichia coli phage T4

Phage

sunY/nrdD

-

1033

258

I-Tev II

NC_000866

 

Escherichia coli phage T4

Phage

td

-

1017

245

I-Tev I

NC_000866

 

Bacillus mojavensis

Firmicutes

thyA

 

1122

266

I-Bmo I

AF321518

 

Bacillus subtilis phage β22

Phage

thy

-

392

pseudo

 

L31962

 

Bacillus anthracis

Firmicutes

nrdE (prophage)

-

1102

253

I-Ban I

NC_003997

H-N-H

        
 

T-even phage RB3

Phage

nrdB

-

1090

269

I-Tev III

X59078

 

Bacillus phage SPO1

Phage

DNA pol

-

882

174

I-Hmu I

M37686

 

Bacillus phage SP82

Phage

DNA pol

-

915

185

I-Hmu II

U04812

 

Bacillus phage ϕe

Phage

DNA pol

-

903

181

 

U04813

 

Escherichia coli phage ΦI

Phage

DNA pol

-

601

131

I-Tsl I

AY769989

 

Escherichia coli phage W31

Phage

DNA pol

-

601

131

I-Tsl I

AY769990

 

Bacillus phage Spbeta

Phage

bnrdF

-

808

173

 

NC_001884

 

Staphylococcal phage Twort

Phage

nrdE

-

1087

243

I-Two I

AF485080

 

Bacillus thuringiensis phage Bastille

Phage

DNA pol

-

853

188

I-Bas I

AY256517

 

Streptococcus thermophilus phage J1

Phage

Lysin

-

1013

253

 

AF148566

 

Lactobacillus delbrueckii subsp. lactis phage LL-H

Phage

terL

-

837

168

 

L37351

PD-(D/E)XK

        
 

Synechocystis sp. PCC 6803

Cyanobacteria

tRNA-fMet

-

655

150

I-Ssp6803 I

U10482

  1. a Organism names. Intron hosts reported in this study are marked with asterisks. Filled circles indicate that homologous introns are found in closely related T-even-like phages [50] and the open circle indicates that homologous introns exist in closely related Bacillus species and strains [4], but are not included in this table.
  2. b Classification of organisms follows that of the NCBI (National Center for Biotechnology Information) GenBank.
  3. c The gene in which the intron is inserted.
  4. d The numbering reflects the Escherichia coli genic position.
  5. e HE length in amino acids (aa). HE gene fragments are indicated (pseudo).
  6. f Active HE proteins that cut the intron minus target sites.