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| Content Provider | PubMed Central |
|---|---|
| Author | Srivastava, L. M. Hübscher, G. |
| Abstract | 1. Lactic acid formation in supernatant fractions of homogenates of cat or rat small-intestinal mucosa was measured under optimum conditions with glucose, fructose, glucose 6-phosphate, fructose 1,6-diphosphate or 3-phosphoglycerate as substrate. 2. Between 80 and 107% of the glycolytic activity of the homogenate was recovered in these particle-free preparations when glucose, fructose, glucose 6-phosphate or fructose 1,6-diphosphate was used as substrate. 3. Evidence was obtained that hexokinase and phosphofructokinase were the rate-limiting enzymes in the initial sequence of glycolytic reactions. The limitation of rate by hexokinase was much more pronounced in preparations from the cat than in those from the rat. 4. With subcellular preparations from cat or rat small intestine lactic acid was also formed from ribose 5-phosphate and at rates similar to those observed with glucose. 5. A higher rate of glycolysis was observed with glucose 6-phosphate as substrate with preparations from the proximal half of the small intestine of the rat as compared with the distal half. 6. Mucosal preparations from rats starved for 24–48hr. exhibited only about one-quarter of the glycolytic activity of those of fed control groups. The decreased rate of formation of lactic acid from either glucose or fructose was mainly due to a decrease in the activity of hexokinase(s). The activities of glucose 6-phosphate dehydrogenase and 6-phosphogluconate dehydrogenase and a number of other enzymes were not significantly decreased by starvation. 7. The results are discussed in relation to metabolic control of glycolysis in other mammalian tissues. |
| Starting Page | 458 |
| File Format | |
| ISSN | 14708728 |
| e-ISSN | 14708728 |
| Journal | Biochemical Journal |
| Issue Number | 2 |
| Volume Number | 100 |
| Language | English |
| Publisher Date | 1966-08-01 |
| Access Restriction | Open |
| Subject Keyword | Research in Higher Education |
| Content Type | Text |
| Resource Type | Article |
| Subject | Cell Biology Molecular Biology Biochemistry |
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