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. 1987 Dec;169(12):5510–5517. doi: 10.1128/jb.169.12.5510-5517.1987

Relationship between two major immunoreactive forms of arginase in Neurospora crassa.

K A Borkovich 1, R L Weiss 1
PMCID: PMC213979  PMID: 2890621

Abstract

Two major immunoreactive proteins of Mr 41,700 and 36,100 have been detected in crude mycelial extracts with polyclonal antibodies raised against arginase purified from Neurospora crassa. The latter corresponded to the protein used to obtain the antibodies. Both polypeptides were either missing or present in very low amounts in mutant strains having little or no detectable arginase activity. The relative proportion of the two species was altered in strains containing the nitrogen catabolite regulatory mutation nit-2. Peptide mapping indicated that the two species are very closely related, but several of the peptides which appeared to be identical by staining reacted differently with the antibodies. Both species were produced by in vitro translation of poly(A)+ mRNA, although the larger species was produced to a much smaller extent than was expected from its abundance in vivo. The results suggest the existence of multiple forms of arginase in N. crassa which differ in their response to nitrogen catabolite regulation.

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