intramolecular oxidoreductase activity, interconverting aldoses and ketoses S-methyl-5-thioribose-1-phosphate isomerase activity https://github.com/geneontology/go-ontology/issues/30193 5-methylthioribose-1-phosphate isomerase activity RHEA:19989 S-methyl-5-thio-D-ribose-1-phosphate aldose-ketose-isomerase activity methylthioribose 1-phosphate isomerase activity 1-phospho-5'-S-methylthioribose isomerase activity molecular_function MTR-1-P isomerase activity Reactome:R-HSA-1299507 S-methyl-5-thio-5-deoxy-D-ribose-1-phosphate ketol-isomerase activity Catalysis of the reaction: S-methyl-5-thio-alpha-D-ribose 1-phosphate = S-methyl-5-thio-D-ribulose 1-phosphate. 5-methylthio-5-deoxy-D-ribose-1-phosphate ketol-isomerase activity MetaCyc:5.3.1.23-RXN GO:0046523 1-PMTR isomerase activity EC:5.3.1.23 S-methyl-5-thio-5-deoxy-D-ribose-1-phosphate aldose-ketose-isomerase activity KEGG_REACTION:R04420 S-methyl-5-thio-alpha-D-ribose-1-phosphate aldose-ketose-isomerase activity Reactome:R-HSA-1237096