TY - JOUR
T1 - Photoaffinity labeling of yeast farnesyl protein transferase and enzymatic synthesis of a Ras protein incorporating a photoactive isoprenoid
AU - Edelstein, Rebecca L.
AU - Distefano, Mark D.
N1 - Funding Information:
1This research was supported by the American Cancer Society (Grants BE-222 and IN-13-33-47). 2To whom correspondence should be addressed.
PY - 1997/6/18
Y1 - 1997/6/18
N2 - Farnesyl protein transferase (FPTase) catalyzes the covalent attachment of a farnesyl (C15) group from farnesyl pyrophosphate (FPP) to a specific cysteine residue of Ras and several other proteins. In this report, photo-active farnesyl and geranylgeranyl pyrophosphate analogs 2-diazo-3,3,3-trifluoropropionyloxy-geranyl pyrophosphate (DATFP-GPP) and 2-diazo-3,3,3-trifluoropropionyloxy-farnesyl pyrophosphate (DATFP-FPP) were used to study the active site of Saccharomyces cerevisiae FPTase. Both analogs are substrates for the enzyme, and upon irradiation, DATFP-GPP inhibits FPTase activity in a time-dependent manner. Photoinactivation by DATFP-GPP is prevented by the presence of the natural substrate FPP. Photolysis of radiolabeled DATFP-GPP results in preferential labeling of the β subunit of FPTase, suggesting that this subunit is involved in recognition of FPP. Of particular importance, DATFP-GPP and DATFP-FPP were used to enzymatically transfer the photo-active isoprenoid moieties to peptides and to Ras; such molecules should be useful for identifying cellular components which specifically recognize farnesylated Ras and other prenylated proteins.
AB - Farnesyl protein transferase (FPTase) catalyzes the covalent attachment of a farnesyl (C15) group from farnesyl pyrophosphate (FPP) to a specific cysteine residue of Ras and several other proteins. In this report, photo-active farnesyl and geranylgeranyl pyrophosphate analogs 2-diazo-3,3,3-trifluoropropionyloxy-geranyl pyrophosphate (DATFP-GPP) and 2-diazo-3,3,3-trifluoropropionyloxy-farnesyl pyrophosphate (DATFP-FPP) were used to study the active site of Saccharomyces cerevisiae FPTase. Both analogs are substrates for the enzyme, and upon irradiation, DATFP-GPP inhibits FPTase activity in a time-dependent manner. Photoinactivation by DATFP-GPP is prevented by the presence of the natural substrate FPP. Photolysis of radiolabeled DATFP-GPP results in preferential labeling of the β subunit of FPTase, suggesting that this subunit is involved in recognition of FPP. Of particular importance, DATFP-GPP and DATFP-FPP were used to enzymatically transfer the photo-active isoprenoid moieties to peptides and to Ras; such molecules should be useful for identifying cellular components which specifically recognize farnesylated Ras and other prenylated proteins.
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U2 - 10.1006/bbrc.1997.6792
DO - 10.1006/bbrc.1997.6792
M3 - Article
C2 - 9199201
AN - SCOPUS:0031577175
SN - 0006-291X
VL - 235
SP - 377
EP - 382
JO - Biochemical and Biophysical Research Communications
JF - Biochemical and Biophysical Research Communications
IS - 2
ER -