Table 1 Most common inteins in nuclear (nDNA), chloroplast (cpDNA), and eukaryotic virus (vDNA) genomes
Protein | Number of inteins | KOG or COG (category) | Description: full name | Distribution |
|---|---|---|---|---|
nDNA | ||||
 Prp8 | 104 | KOG1795 (A) | pre-mRNA processing factor 8 | Pezizomycotina, Agaricomycotina, Ustilaginomycotina, Mucoromycota, Blastocladiomycota, Chytridiomycota, Amoebozoa, Choanoflagellida, Chlorophyta |
 VMA1 | 42 | KOG1352 (C) | vacuolar ATPase, subunit A | Pezizomycotina, Saccharomycotina, Taphrinomycotina, Puccinomycotina |
 DdRP | 21 | KOG0214–0216 (K) | RNA polymerase subunits | Pezizomycotina, Agaricomycotina, Ustilaginomycotina, Bladtocladiomycota, Chytridiomycota, Amoebozoa |
 ThrRS | 5 | KOG1637 (J) | Threonyl-tRNA synthetase | Saccharomycotina |
 GLT | 5 | KOG0399 (E) | Glutamate synthase | Pezizomycotina, Saccharomycotina |
 CHS | 4 | KOG2571 (M) | Chitin synthase | Pezizomycotina |
 IF2 eIF5B | 3 | KOG1144 (J) | Eukaryotic translation initiation factor | Chytridiomycota, Glomeromycota |
cpDNA | ||||
 DnaB | 56 | COG0305 (L) | DNA replication helicase (DnaB-like) | Rhodophyta, Heterokonta, Cryptophyta |
 DdRP | 12 | COG0085 (K) | RNA polymerase subunit beta (RpoB) | Chlorophyta |
 ClpP | 3 | COG0740 (OU) | ATP-dependent Clp protease, proteolytic subunit | Chlorophyta |
vDNA | ||||
 DdDP | 67 | KOG0969 (L) | DNA polymerases | Phycodnaviridae, Iridoviridae, Mimiviridae, unclassified dsDNA viruses, unclassified viruses |
 RIR | 34 | KOG1112 (F) | Ribonucleoside-diphosphate reductases | Phycodnaviridae, Iridoviridae, Mimiviridae, Marseilleviridae, unclassified dsDNA viruses, unclassified viruses |
 Helicases | 20 | KOG1123 (KL), KOG2548 (A), KOG0947 (A) | Assorted DNA and RNA helicases | Phycodnaviridae, Marseilleviridae, unclassified dsDNA viruses, unclassified viruses |
 DdRP | 9 | KOG0214 (K) | RNA polymerase subunits | Phycodnaviridae, Mimiviridae, unclassified dsDNA viruses |
 MutS-like | 2 | KOG0217 (L) | Putative DNA mismatch repair protein | Mimiviridae |