Characterization of the C-terminal domain of ras-GTPase-activating protein (ras-GAP) as substrate for epidermal growth factor receptor and p60c-src kinase.
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Characterization of the C-terminal domain of ras-GTPase-activating protein (ras-GAP) as substrate for epidermal growth factor receptor and p60c-src kinase. / Borowski, P; Kornetzky, L; Heiland, M; Roloff, S; Weber, Wolfgang; Laufs, R.
in: Biochem Mol Biol Int, Jahrgang 39, Nr. 3, 3, 1996, S. 635-646.Publikationen: SCORING: Beitrag in Fachzeitschrift/Zeitung › SCORING: Zeitschriftenaufsatz › Forschung › Begutachtung
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TY - JOUR
T1 - Characterization of the C-terminal domain of ras-GTPase-activating protein (ras-GAP) as substrate for epidermal growth factor receptor and p60c-src kinase.
AU - Borowski, P
AU - Kornetzky, L
AU - Heiland, M
AU - Roloff, S
AU - Weber, Wolfgang
AU - Laufs, R
PY - 1996
Y1 - 1996
N2 - We describe in vitro tyrosine phosphorylation of the C-terminal 334 amino acids of ras-GTPase-activating protein (ras-GAP)1 that contains the activity domain for ras interaction. To date, there have been no other phosphorylation sites determined than the reported in N-terminal domain of ras-GAP Tyr-460, which is considered to be the major phosphorylation site of ras-GAP. In our assays some differences of the kinetic parameters were observed when the reaction was catalyzed by EGF-R compared to p60c-src. Enzyme specific regulation of activity is associated with autophosphorylation which leads to reduced (in case of EGF-R) or increased (in case of p60c-src) phosphorylation of the C-terminal 334 amino acids of ras-GAP (GAP334). Because of the characteristics of these investigated reactions the phosphorylation of GAP334 seems to be-independent from the presence of SH2 or SH3 domains-triggered off by complex mechanisms different from those regulating the phosphorylation at Tyr-460.
AB - We describe in vitro tyrosine phosphorylation of the C-terminal 334 amino acids of ras-GTPase-activating protein (ras-GAP)1 that contains the activity domain for ras interaction. To date, there have been no other phosphorylation sites determined than the reported in N-terminal domain of ras-GAP Tyr-460, which is considered to be the major phosphorylation site of ras-GAP. In our assays some differences of the kinetic parameters were observed when the reaction was catalyzed by EGF-R compared to p60c-src. Enzyme specific regulation of activity is associated with autophosphorylation which leads to reduced (in case of EGF-R) or increased (in case of p60c-src) phosphorylation of the C-terminal 334 amino acids of ras-GAP (GAP334). Because of the characteristics of these investigated reactions the phosphorylation of GAP334 seems to be-independent from the presence of SH2 or SH3 domains-triggered off by complex mechanisms different from those regulating the phosphorylation at Tyr-460.
KW - Humans
KW - Kinetics
KW - Phosphorylation
KW - Enzyme Activation
KW - Tumor Cells, Cultured
KW - Electrophoresis, Polyacrylamide Gel
KW - Receptor, Epidermal Growth Factor/metabolism
KW - Proteins/chemistry/metabolism
KW - Trypsin/metabolism
KW - GTPase-Activating Proteins
KW - Histones/pharmacology
KW - Magnesium/metabolism
KW - Manganese/metabolism
KW - Ovalbumin/pharmacology
KW - Peptide Fragments/metabolism
KW - Phosphopeptides/analysis/metabolism
KW - Phosphoserine/analysis/metabolism
KW - Phosphothreonine/analysis/metabolism
KW - Phosphotyrosine/analysis/metabolism
KW - Polyglutamic Acid/analogs & derivatives/pharmacology
KW - Polylysine/analogs & derivatives/pharmacology
KW - Tyrosine/metabolism
KW - ras GTPase-Activating Proteins
KW - src-Family Kinases/metabolism
KW - Humans
KW - Kinetics
KW - Phosphorylation
KW - Enzyme Activation
KW - Tumor Cells, Cultured
KW - Electrophoresis, Polyacrylamide Gel
KW - Receptor, Epidermal Growth Factor/metabolism
KW - Proteins/chemistry/metabolism
KW - Trypsin/metabolism
KW - GTPase-Activating Proteins
KW - Histones/pharmacology
KW - Magnesium/metabolism
KW - Manganese/metabolism
KW - Ovalbumin/pharmacology
KW - Peptide Fragments/metabolism
KW - Phosphopeptides/analysis/metabolism
KW - Phosphoserine/analysis/metabolism
KW - Phosphothreonine/analysis/metabolism
KW - Phosphotyrosine/analysis/metabolism
KW - Polyglutamic Acid/analogs & derivatives/pharmacology
KW - Polylysine/analogs & derivatives/pharmacology
KW - Tyrosine/metabolism
KW - ras GTPase-Activating Proteins
KW - src-Family Kinases/metabolism
M3 - SCORING: Journal article
VL - 39
SP - 635
EP - 646
IS - 3
M1 - 3
ER -