Fix DHODH Reactions

[Devlin-Moyer]

Main improvements in this PR:

As proposed in #609:

• Creates a new metabolite MAM20019c to represent cytosolic FMNH₂
• Replaces MAM03103m with MAM01828c and MAM03102m with MAM20019c in MAR04575
• Creates a new reaction to represent redox of FMN(H2) and ubiquinone/ubiquinol catalyzed by DHODH: MAR20167: MAM20019c + MAM03103m <-> MAM01828c + MAM03102m, GPR: ENSG00000102967, references: PMID:34428349

I hereby confirm that I have:

• Tested my code on my own computer for running the model
• Selected develop as a target branch
• Any removed reactions and metabolites have been moved to the corresponding deprecated identifier lists

[haowang-bioinfo]

looks fine - suggest to add Rhea id: 30187

[Devlin-Moyer]

I feel a bit weird about that, cuz after these changes, MAR04575 would be redox between (dihydro)orotate and FMN(H2), and MAR20167 would be redox between FMN(H2) and ubiquinone/ol, and that RHEA ID is for redox between (dihydro)orotate and ubiquinone/ol. There doesn't appear to be a RHEA ID that exactly matches either of these reactions, but I suppose I could add 31087 as the RHEA ID for both MAR04575 and MAR20167 if that's what you were suggesting

[haowang-bioinfo]

sorry my comments was not clear, what I suggested was adding this Rhea id to MAR20167. What do you think?

I feel a bit weird about that, cuz after these changes, MAR04575 would be redox between (dihydro)orotate and FMN(H2), and MAR20167 would be redox between FMN(H2) and ubiquinone/ol, and that RHEA ID is for redox between (dihydro)orotate and ubiquinone/ol. There doesn't appear to be a RHEA ID that exactly matches either of these reactions, but I suppose I could add 31087 as the RHEA ID for both MAR04575 and MAR20167 if that's what you were suggesting

@Devlin-Moyer does this mean that Rhea:30187 is equivalent to the merging of MAR04575+MAR20167?