Definition of the protein kinase C interaction site of phospholipase D

Seung Kiel Park, Do Sik Min, John H. Exton

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54 Citations (Scopus)


Serial deletions of the N-terminal 319 amino acids of rPLD1 expressed in COS-7 cells resulted in increased basal PLD activity. Incubation of the cells with phorbol myristate acetate increased the activity of endogenous and wild-type rPLD1. The mutant rPLD1 with deletion of the first 50 amino acids responded to the phorbol ester, however, rPLD1 with deletions of 115 amino acids or more did not. In cells in which constitutively active V14RhoA was co-expressed with the mutant PLDs, stimulation of PLD activity was observed with all deletion mutants. In membranes from COS-7 cells in which the mutant PLDs were expressed, only the mutant with deletion of 50 N-terminal amino acids responded to added protein kinase C-α and phorbol ester, in agreement with the in vivo studies. When myristoylated ADP-ribosylation factor 3 (mARF3) was added together with guanosine 5'-3-O-(thio)triphosphate, all mutants showed stimulation of PLD activity. It is concluded that the site of interaction of protein kinase C with rPLD1 is located in the N-terminal region and that Rho and ARF interact at other sites.

Original languageEnglish
Pages (from-to)364-367
Number of pages4
JournalBiochemical and Biophysical Research Communications
Issue number2
Publication statusPublished - 1998 Mar 17

Bibliographical note

Funding Information:
1Supported in part by NIH Grant 5 RO1 DK47448. 2 To whom all correspondence should be addressed. Fax: (615) 322-4381. E-mail:

All Science Journal Classification (ASJC) codes

  • Biophysics
  • Biochemistry
  • Molecular Biology
  • Cell Biology


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