transketolase activity GO:0004802 xref updates

[sjm41]

id: GO:0004802
name: transketolase activity
namespace: molecular_function
def: "Catalysis of the reversible transfer of a 2-carbon ketol group (CH2OH-CO-) from a ketose phosphate donor to an aldose phosphate acceptor." [GOC:fmc, RHEA:10508]
synonym: "fructose 6-phosphate:D-glyceraldehyde-3-phosphate glycolaldehydetransferase activity" NARROW [GOC:fmc, GOC:mah]
synonym: "glycoaldehyde transferase activity" RELATED [EC:2.2.1.1]
synonym: "glycolaldehydetransferase activity" RELATED [EC:2.2.1.1]
synonym: "sedoheptulose-7-phosphate:D-glyceraldehyde-3-phosphate glycolaldehydetransferase activity" NARROW [EC:2.2.1.1]
xref: EC:2.2.1.1
xref: MetaCyc:1TRANSKETO-RXN
xref: RHEA:10508
is_a: GO:0016744 ! transketolase or transaldolase activity

The GO def here is correctly broad.
E.g. the EC:2.2.1.1 says:
Reaction: D-glyceraldehyde 3-phosphate + D-sedoheptulose 7-phosphate = aldehydo-D-ribose 5-phosphate + D-xylulose 5-phosphate
Comment: Wide specificity for both reactants, e.g. converts hydroxypyruvate and R-CHO into CO2 and R-CHOH-CO-CH2OH.

And RHEA maps EC:2.2.1.1 to two distinct RHEAs:

RHEA:10508 (40,468 proteins in UniProtKB)
D-glyceraldehyde 3-phosphate + D-sedoheptulose 7-phosphate = aldehydo-D-ribose 5-phosphate + D-xylulose 5-phosphate
=> this is the first reaction catalysed by the TKT enzyme in the Pentose Phosphate Pathway (e.g. see https://reactome.org/PathwayBrowser/#/R-HSA-71336&SEL=R-HSA-71324)

RHEA:27626 (0 proteins in UniProtKB)
D-erythrose 4-phosphate + D-xylulose 5-phosphate = β-D-fructose 6-phosphate + D-glyceraldehyde 3-phosphate
=> this is the second reaction catalysed by the TKT enzyme in the Pentose Phosphate Pathway (e.g. see https://reactome.org/PathwayBrowser/#/R-HSA-71336&SEL=R-HSA-71335)

So, actions here:

• Make EC:2.2.1.1 exactMatch
• Use EC in def xref instead of RHEA
• Make RHEA:10508 narrowMatch
• Add RHEA:27626 as narrowMatch
• Make MetaCyc:1TRANSKETO-RXN narrowMatch
• Add MetaCyc:2TRANSKETO-RXN as narrowMatch