Arabinose kinase. Involved in the salvage pathway which converts free L-arabinose to UDP-L-arabinose. May play a role in arabinose transport. ATP + L-arabinose = ADP + beta-L-arabinose 1-phosphate + H(+) Sup1, a suppressor of the ara1-1 arabinose-sensitive phenotype, contains a second point mutation resulting in a premature stop codon and a complete loss of kinase activity. Therefore, the putative arabinose transport function is independent from the kinase activity. Belongs to the GHMP kinase family. Truncated N-terminus.