Closed pgaudet closed 2 years ago
Not sure if it's a good idea to merge the ATP and CTP forms of this reaction.
(2E,6E)-farnesol + CTP = (2E,6E)-farnesyl phosphate + CDP + H(+) (2E,6E)-farnesol + ATP = (2E,6E)-farnesyl phosphate + ADP + H(+)
I seem to remember the rat enzyme uses CTP not ATP, plant uses both. I guess we may find species that only use ATP later. Why not do a CTP-dependent and an ATP-dependent GO term?
'ATP-dependent farnesol kinase activity' 'CTP-dependent farnesol kinase activity'
or even
'ATP-dependent (2E,6E)-farnesol kinase activity' 'CTP-dependent (2E,6E)-farnesol kinase activity'
OK - Paul and I thought we should merge because EC describes the CTP version, and states "The enzyme, found in plants and animals, can also use other nucleotide triphosphates as phosphate donor, albeit less efficiently. "
https://enzyme.expasy.org/EC/2.7.1.216
I'll look for more evidence.
The difference between plant and human seems to be the substrate, not the nucleoide used, according to the same EC entry: "The plant enzyme can also use geraniol and geranylgeraniol as substrates with lower activity, but not farnesyl phosphate (cf. EC 2.7.4.32). "
I was kind of worried we would have to demerge these later and remap to the 2 Rheas. I scanned the article on rat, fig 5 shows activity only for CTP there: https://reader.elsevier.com/reader/sd/pii/S0003986198906117?token=4FC6B771CD1EB4F58D921BC03E3479BC8241708875C512B62DE0059C634C98E04EA09C7DA9CC387F94125C52723266A3&originRegion=eu-west-1&originCreation=20210618115956.
I would be interested to know why this kinase is using CTP but I'm in meetings all afternoon so can't follow it up! There must be something to that though. This alone might be a good reason for a CTP-specific term?
We now have 2 terms for farnesol kinase activity:
GO:0052668 -name: farnesol kinase activity +name: CTP:farnesol kinase activity RHEA: 51680
id: GO:0102237 -name: ATP-dependent farnesol kinase activity +name: ATP:farnesol kinase activity RHEA:61656
both cite the plant paper PMID:21395888
Looks like the tobacco gene is specific for CTP (PMID:10557276) and the Arabidosis gene can use other nucleotides
So I will keep both terms.
thanks!
Terms with labels 'ATP-dependent x':
Look at separately