EC Number |
Substrates |
Organism |
Products |
Reversibility |
---|
2.7.7.72 | more |
both isoforms Cca1 and Cca2 accept the complete sets of cytosolic and mitochondrial tRNAs at the individual developmental stages. Isoform Cca2 shows efficient binding to the substrates with a Kd of 2.3 microM and 1.7 microM for the in vitro transcript and the in vivo tRNA preparation, respectively. Isoform Cca1 shows almost no binding at any protein concentration |
Dictyostelium discoideum |
? |
- |
- |
2.7.7.72 | more |
enzyme accepts normal tRNA precursors as well as mitochondrial miniaturized hairpin-like tRNA molecules that lack D- as well as T-arms |
Romanomermis culicivorax |
? |
- |
- |
2.7.7.72 | a tRNA precursor + 2 CTP + ATP |
- |
Arabidopsis thaliana |
a tRNA with a 3'CCA end + 3 diphosphate |
- |
? |
2.7.7.72 | a tRNA precursor + 2 CTP + ATP |
- |
Saccharolobus shibatae |
a tRNA with a 3'CCA end + 3 diphosphate |
- |
? |
2.7.7.72 | a tRNA precursor + 2 CTP + ATP |
- |
Homo sapiens |
a tRNA with a 3' CCA end + 3 diphosphate |
- |
? |
2.7.7.72 | a tRNA precursor + 2 CTP + ATP |
- |
Archaeoglobus fulgidus |
a tRNA with a 3' CCA end + 3 diphosphate |
- |
? |
2.7.7.72 | a tRNA precursor + 2 CTP + ATP |
- |
Saccharomyces cerevisiae |
a tRNA with a 3' CCA end + 3 diphosphate |
- |
? |
2.7.7.72 | a tRNA precursor + 2 CTP + ATP |
overall reaction |
Saccharolobus shibatae |
a tRNA with a 3' CCA end + 3 diphosphate |
- |
? |
2.7.7.72 | a tRNA precursor + 2 CTP + ATP |
the 30-region of RNA is proofread, after two nucleotide additions, in the closed, active form of the complex at the AMP incorporation stage. This proofreading is a prerequisite for the maintenance of fidelity for complete CCA synthesis |
Archaeoglobus fulgidus |
a tRNA with a 3' CCA end + 3 diphosphate |
- |
? |
2.7.7.72 | a tRNA precursor + 2 CTP + ATP |
one catalytic center is responsible for addition of both CTP and ATP. As the single active site catalyzes addition of each nucleotide, the growing 3'-end of the tRNA would progressively refold to create a binding pocket for addition of the next nucleotide |
Saccharolobus shibatae |
a tRNA with a 3' CCA end + 3 diphosphate |
- |
? |