Uridylate kinase; Catalyzes the reversible phosphorylation of UMP to UDP.

Pyrimidine-nucleoside phosphorylase; Identified by match to protein family HMM PF00591; match to protein family HMM PF02885; match to protein family HMM PF07831; match to protein family HMM TIGR02644.

Orotidine 5'-phosphate decarboxylase; Catalyzes the decarboxylation of orotidine 5'-monophosphate (OMP) to uridine 5'-monophosphate (UMP); Belongs to the OMP decarboxylase family. Type 1 subfamily.

Purine nucleoside phosphorylase I, inosine and guanosine-specific; The purine nucleoside phosphorylases catalyze the phosphorolytic breakdown of the N-glycosidic bond in the beta- (deoxy)ribonucleoside molecules, with the formation of the corresponding free purine bases and pentose-1-phosphate.

GMP synthase; Catalyzes the synthesis of GMP from XMP.

Purine nucleoside phosphorylase; Identified by match to protein family HMM PF01048; match to protein family HMM TIGR00107.

PyrR bifunctional protein; Regulates transcriptional attenuation of the pyrimidine nucleotide (pyr) operon by binding in a uridine-dependent manner to specific sites on pyr mRNA. This disrupts an antiterminator hairpin in the RNA and favors formation of a downstream transcription terminator, leading to a reduced expression of downstream genes. Belongs to the purine/pyrimidine phosphoribosyltransferase family. PyrR subfamily.

Conserved hypothetical protein; Identified by match to protein family HMM PF00702; match to protein family HMM TIGR01509; match to protein family HMM TIGR01549.

Serine hydroxymethyltransferase; Catalyzes the reversible interconversion of serine and glycine with tetrahydrofolate (THF) serving as the one-carbon carrier. This reaction serves as the major source of one-carbon groups required for the biosynthesis of purines, thymidylate, methionine, and other important biomolecules. Also exhibits THF-independent aldolase activity toward beta-hydroxyamino acids, producing glycine and aldehydes, via a retro-aldol mechanism.