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The effect of ethanol on the proteolytic activity of pepsin towards gastric mucus glycoprotein was investigated. Undegraded mucus glycoprotein isolated from pig stomach was incubated with pepsin in the presence and absence of ethanol, and the released alpha-amino residues were quantitated by the trinitrophenylation procedure. In the absence of ethanol the rate of proteolysis was proportional to mucus glycoprotein concentration up to 450 micrograms and remained constant with time of incubation for at least 30 min. The apparent Km value of pepsin for pig gastric mucus glycoprotein was 8.7 X 10(-7)M. The proteolytic activity of pepsin towards mucus glycoprotein was inhibited by ethanol. The rate of inhibition was proportional to the ethanol concentration up to 0.8 M and was of competitive type. The apparent K1 value calculated from the double-reciprocal plots for ethanol was 2.2 X 10(-6)M. The inhibitory effect of ethanol on the proteolysis of gastric mucus glycoprotein may be of physiological significance.
W Laszewicz, and
A Slomiany, and
V L Murty, and
Y H Liau, and
B L Slomiany
July 1985,
Biochemistry,
W Laszewicz, and
A Slomiany, and
V L Murty, and
Y H Liau, and
B L Slomiany
August 1988,
The Journal of biological chemistry,
W Laszewicz, and
A Slomiany, and
V L Murty, and
Y H Liau, and
B L Slomiany
May 1997,
Alcoholism, clinical and experimental research,
W Laszewicz, and
A Slomiany, and
V L Murty, and
Y H Liau, and
B L Slomiany
January 1987,
Digestion,
W Laszewicz, and
A Slomiany, and
V L Murty, and
Y H Liau, and
B L Slomiany
January 1986,
Digestion,
W Laszewicz, and
A Slomiany, and
V L Murty, and
Y H Liau, and
B L Slomiany
January 1984,
Journal of applied biochemistry,
W Laszewicz, and
A Slomiany, and
V L Murty, and
Y H Liau, and
B L Slomiany
July 1988,
South African medical journal = Suid-Afrikaanse tydskrif vir geneeskunde,
W Laszewicz, and
A Slomiany, and
V L Murty, and
Y H Liau, and
B L Slomiany
November 1932,
Canadian Medical Association journal,
W Laszewicz, and
A Slomiany, and
V L Murty, and
Y H Liau, and
B L Slomiany
June 1984,
Biochemical and biophysical research communications,
W Laszewicz, and
A Slomiany, and
V L Murty, and
Y H Liau, and
B L Slomiany
September 1988,
Biochemical pharmacology,
