Catalyzes the ATP-dependent phosphorylation of 5-deoxyribose into 5-deoxy-alpha-D-ribose 1-phosphate, as part of a 5-deoxyribose salvage pathway that recycles this toxic radical SAM enzyme by-product to mainstream metabolites. Is also able to catalyze the phosphorylation of 5-methylthioribose into methylthioribose 1-phosphate, but this enzyme may not function in methionine salvage in B.thuringiensis since it exists a paralog (MtnK) present in the methionine salvage pathway cluster. Does not act on 5-deoxyribulose, 2-deoxyribose, ribose, fucose, fructose, fructose 6-phosphate, and glucose. 5-deoxy-D-ribose + ATP = 5-deoxy-alpha-D-ribose 1-phosphate + ADP + H(+) 5-(methylsulfanyl)-D-ribose + ATP = ADP + H(+) + S-methyl-5-thio-alpha-D-ribose 1-phosphate kcat is 15.4 sec(-1) with 5-deoxy-D-ribose as substrate. kcat is 6.2 sec(-1) with S-methyl-5-thio-D-ribose as substrate. Carbohydrate degradation. Homodimer. Belongs to the methylthioribose kinase family.