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Table 2 Frequencies of Fungal Nucleotides at Sites of Spliceosomal Intron Insertion

From: The exon context and distribution of Euascomycetes rRNA spliceosomal introns

Intron Position

   

Insertion Site

    

Ec

Sc

All

+ Int

- Int

5'-nt

3'-nt

All

+ Int

- Int

# Int

265

336

99.8

100.0

99.8

G

G

95.0

85.7

95.3

4

297

369

65.3

97.8

63.9

U

A

100.0

100.0

99.5

5

298

370

100.0

100.0

99.5

A

G

100.0

100.0

100.0

2

299

371

100.0

100.0

100.0

G

G

99.8

100.0

99.8

12

300

372

99.8

100.0

99.8

G

G

99.7

100.0

99.6

1

330

402

99.1

100.0

99.1

C

G

99.5

100.0

99.4

15

331

403

99.5

100.0

99.4

G

G

99.7

100.0

99.7

8

332

404

99.7

100.0

99.7

G

C

99.6

100.0

99.6

1

333

405

99.6

100.0

99.6

C

U

91.5

100.0

91.1

1

337

409

76.7

87.0

76.3

C

A

99.8

100.0

99.8

1

390

461

99.3

97.5

99.4

G

G

93.1

100.0

92.9

2

393

464

99.6

100.0

99.6

A

G

99.6

100.0

99.5

10

400

471

99.6

100.0

99.6

A

U

97.6

95.0

97.7

1

514

561

99.5

100.0

99.4

G

G

99.5

100.0

99.4

1

674

885

99.7

100.0

99.7

G

U

99.8

100.0

99.8

4

882

1106

67.3

75.8

67.0

U

G

80.5

84.9

80.3

1

883

1107

80.5

84.9

80.3

G

G

99.4

100.0

99.4

6

939

1164

99.2

97.1

99.3

G

G

98.7

97.1

98.8

8

1057

1277

99.8

100.0

99.8

G

G

98.8

100.0

98.7

1

1071

1291

93.4

100.0

93.3

G

G

99.4

100.0

99.4

1

1083

1303

99.5

100.0

99.5

U

G

99.6

100.0

99.6

1

1226

1459

99.1

100.0

99.1

C

A

99.8

100.0

99.8

2

1229

1462

99.7

100.0

99.7

G

C

99.4

100.0

99.3

8

1514

1777

98.6

100.0

98.5

G

G

91.1

100.0

90.9

2

678

967

99.9

100.0

99.9

G

A

99.9

97.0

100.0

16

681

970

99.7

97.0

99.9

G

G

98.1

93.9

98.3

1

711

1000

99.6

97.0

99.7

G

A

98.2

81.8

99.0

3

775

1065

99.8

100.0

99.8

G

G

100.0

100.0

100.0

1

776

1066

100.0

100.0

100.0

G

G

100.0

100.0

100.0

5

777

1067

100.0

100.0

100.0

G

G

100.0

100.0

100.0

1

780

1070

100.0

100.0

100.0

G

A

100.0

100.0

100.0

1

783

1073

100.0

100.0

100.0

A

G

100.0

100.0

100.0

2

784

1074

100.0

100.0

100.0

G

A

100.0

100.0

100.0

3

786

1076

99.8

100.0

99.8

C

U

95.8

91.2

96.1

1

787

1077

95.8

91.2

96.1

U

A

98.7

91.2

99.1

1

824

1114

100.0

100.0

100.0

U

C

100.0

100.0

100.0

1

830

1120

99.8

100.0

99.8

A

G

99.8

100.0

99.8

1

858

1151

100.0

100.0

100.0

G

G

100.0

100.0

100.0

2

978

1306

99.3

95.7

99.6

G

G

100.0

100.0

100.0

3

1024

1351

98.6

100.0

98.5

A

G

99.3

100.0

99.3

1

1054

1387

97.6

100.0

97.4

G

G

100.0

100.0

100.0

4

1091

1424

100.0

100.0

100.0

G

U

99.3

100.0

99.2

1

1093

1426

100.0

100.0

100.0

G

U

100.0

100.0

100.0

1

1098

1431

100.0

100.0

100.0

A

A

99.3

100.0

99.2

1

1849

2367

100.0

100.0

100.0

U

G

100.0

100.0

100.0

1

1903

2404

97.3

100.0

97.1

G

G

100.0

100.0

100.0

1

1929

2430

97.3

100.0

97.1

G

G

97.3

100.0

97.1

1

2076

2576

100.0

100.0

100.0

G

A

100.0

100.0

100.0

1

2445

2972

100.0

100.0

100.0

G

G

100.0

100.0

100.0

1

  1. Column headings: Intron Position, the sites of spliceosomal intron insertion in the SSU and LSU (below the broken line) rRNA genes. The homologous intron sites in the Escherichia coli (Ec, GenBank #J01695) and Saccharomyces cerevisiae (Sc, GenBank #U53879) genes are shown. The 5' and 3' nucleotides (5'-nt, 3'-nt) flanking the intron insertion sites (Insertion Site), the frequency of these nucleotides in the alignment of all fungal SSU and LSU rRNAs (All, 1434 and 880 sequences, respectively), of fungi containing spliceosomal introns (+ Int, 73 and 40 sequences, respectively), and of fungi lacking spliceosomal introns (- Int, 1361 and 840 sequences, respectively), and the number of taxa containing introns at each site (# Int) are shown.