Cloning of the fourth functional gene for Protein Phosphatase 1 in Drosophila melanogaster from its chromosomal location


  • Note. The first two authors have made equal contributions to this work.

    The novel nucleotide sequence data published here has been deposited with the EMBL sequence data banks and is available under accession number X69974.

Correspondence to P. T. W. Cohen, Medical Research Council Protein Phosphorylation Unit, Department of Biochemistry, The University, Dundee, Scotland DD1 4HN
Fax: + 44 382 23778.


Complementary DNA encoding a catalytic subunit of protein phosphatase 1, PP1 87B, hybridises at four positions (87B, 9C, 13C and 96A) to Drosophila melanogaster polytene chromosomes, three of which are known to be expressed [Dombrádi, V., Axton, J. M., Brewis, N. D., Da Cruz e Silva, E. F., Alphey, L. & Cohen, P. T. W. (1990) Eur. J. Biochem. 194, 739–745]. The fourth gene has been isolated by screening a genomic library of cosmid clones, representing division 13 of the X-chromosome of D. melanogaster, with a PP1 87B probe. This library was constructed as part of the Drosophila genome mapping project [Sidén-Kiamos, I., Saunders, R. D. C., Spanos, L., Majerus, T., Trenear, J., Savakis, C., Louis, C., Glover, D. M., Ashburner, M. & Kafatos, F. C. (1990) Nucleic Acids Res. 18, 6261–6270]. The 5′ non-coding region of the isolated gene hybridised to cytological position 13C1–2. By combining reverse transcription and the polymerase chain reaction, the gene was shown to be expressed at a very low level.

The PP1 13C gene encodes a protein of 302 amino acids with a predicted molecular mass of 34.5 kDa. It shows 85–94% amino acid identity to the other three protein phosphatase 1 catalytic subunits (PP1 87B, PP1 96A and PP1 9C) described previously, being most closely related to the isoform PP1 87B, which is involved in the control of chromosome separation at cell division and the regulation of chromosome condensation at interphase.


protein phosphatase


polymerase chain reaction


Protein phosphatase (EC