3.4.16.6 - 647236 3.4.16.6 crystal structure at 2.2 A resolution 647231 3.4.16.6 crystal structure of KEX1DELTAp, an enzyme form lacking the acidic and the membrane-spanning domain at 2.4 A resolution 647233 3.4.16.6 structure of Kex1DELTAp, an enzyme that lacks the acidic domain and membrane-spanning portion of Kex1p 647233