This family consists of bacterial antibiotic resistance proteins, which confer resistance to various aminoglycosides they include: aminoglycoside 3'-phosphotransferase or kanamycin kinase / neomycin-kanamycin phosphotransferase and streptomycin 3''-kinase or streptomycin 3''-phosphotransferase. The aminoglycoside phosphotransferases inactivate aminoglycoside antibiotics via phosphorylation [2]. This family also includes homoserine kinase. This family is related to fructosamine kinase Pfam:PF03881.

1: Cloning of aminoglycoside phosphotransferase (APH) gene from antibiotic- producing strain of Bacillus circulans into a high-expression vector, pKK223-3. Purification, properties and location of the enzyme [published erratum appears in Biochem J 1991 Feb 1 Sarwar M, Akhtar M; Biochem J 1990;268:671-677. PMID:2163618

2: PCR cloning of a streptomycin phosphotransferase (aphE) gene from Streptomyces griseus ATCC 12475. Trower MK, Clark KG; Nucleic Acids Res 1990;18:4615-4615. PMID:2167474