3-methyl-2-oxobutanoate hydroxymethyltransferase activity https://github.com/geneontology/go-ontology/issues/30193 MetaCyc:3-CH3-2-OXOBUTANOATE-OH-CH3-XFER-RXN alpha-ketoisovalerate hydroxymethyltransferase activity molecular_function oxopantoate hydroxymethyltransferase activity 5,10-methylene tetrahydrofolate:alpha-ketoisovalerate hydroxymethyltransferase activity GO:0003864 dehydropantoate hydroxymethyltransferase activity ketopantoate hydroxymethyltransferase activity RHEA:11824 5,10-methylenetetrahydrofolate:3-methyl-2-oxobutanoate hydroxymethyltransferase activity EC:2.1.2.11 Catalysis of the reaction: 5,10-methylenetetrahydrofolate + 3-methyl-2-oxobutanoate = tetrahydrofolate + 2-dehydropantoate. hydroxymethyl-, formyl- and related transferase activity