Pyridoxal kinase involved in the salvage pathway of pyridoxal 5'-phosphate (PLP). Catalyzes the phosphorylation of pyridoxal to PLP. ATP + pyridoxal = ADP + H(+) + pyridoxal 5'-phosphate Cofactor metabolism; pyridoxal 5'-phosphate salvage; pyridoxal 5'-phosphate from pyridoxal: step 1/1. Homodimer. Belongs to the pyridoxine kinase family. PdxY subfamily.