Purity ~90% (SDS-PAGE). Can bind free heme and also acquire it from hemoglobin. Conveys heme from hemoglobin to the HasR receptor which releases it into the bacterium. HasR alone can take up heme but the synergy between HasA and HasR increases heme uptake 100-fold. Source: Recombinant protein corresponding to aa1-188 from serratia marcescens hasA, fused to His-SUMO-Tag at N-terminal expressed in E. coli. Molecular Weight: ~35.3kD AA