Western blot analysis of Alr1p. S. pombe SP1
cells exponentially growing on YPD medium (lane 1) or a minimum medium
containing, as a sole nitrogen source, ammonium sulfate (lane 2),
l-alanine (lane 3), or d-alanine (lane 4) were
harvested. Cell extracts were subjected to SDS–13.0% PAGE, blotted
onto a polyvinylidene difluoride membrane, and analyzed with polyclonal
anti-Alr1p antibody. Each lane was loaded with 10 μg of protein.