Isolation and characterisation of two cDNAs encoding transglutaminase from Atlantic cod (Gadus morhua).
Fish Shellfish Immunol
; 36(1): 276-83, 2014 Jan.
Article
in En
| MEDLINE
| ID: mdl-24316498
ABSTRACT
Two cDNAs encoding transglutaminase (TG) were identified in a subtractive cDNA library prepared from the head kidney of poly IC stimulated Atlantic cod (Gadus morhua). Full-length TG-1 and TG-2 cDNA were cloned from the head kidney by a reverse-transcription polymerase chain reaction (RT-PCR) and rapid amplification of cDNA ends (RACE). The deduced amino acid (aa) sequence for TG-1 was 695 aa with an estimated molecular mass of 78.3 kDa, while TG-2 was a 698 aa protein with an estimated molecular mass of 78.8 kDa. The two proteins were named TG-1 and TG-2 and both possess transglutaminase/protease-like homologous domains (TGc) and full conservation of amino acids cysteine, histidine, and aspartate residues that form the catalytic triad. Sequence analysis showed high similarity (93.1%) with Alaska pollock TG, and the TGs were grouped together with TGs from chum salmon, Japanese flounder, Nile tilapia, and red sea bream in addition to Alaska pollock in phylogenetic analysis. Interestingly, they showed different tissue distribution with highest constitutive expression in reproductive and immunological organs, indicating important roles in these organs. Furthermore, the up-regulation of TG-1 and TG-2 in head kidney after stimulating Atlantic cod with poly IC suggested a role of TGs in immune response in Atlantic cod.
Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Phylogeny
/
Transglutaminases
/
GTP-Binding Proteins
/
Gadus morhua
/
Head Kidney
Limits:
Animals
Language:
En
Journal:
Fish Shellfish Immunol
Journal subject:
BIOLOGIA
/
MEDICINA VETERINARIA
Year:
2014
Document type:
Article