Id |
Subject |
Object |
Predicate |
Lexical cue |
T1 |
0-24 |
Sentence |
denotes |
Biosynthesis of heparin. |
T2 |
25-69 |
Sentence |
denotes |
Studies on the microsomal sulfation process. |
T3 |
70-262 |
Sentence |
denotes |
Nonsulfated, partially N-deacetylated, 14C-labeled polysaccharide was formed by incubation of a mouse mastocytoma microsomal fraction with UDP-[14C]glucuronic acid and UDP-N-acetylglucosamine. |
T4 |
263-463 |
Sentence |
denotes |
After 60 min at 37 degrees the incorporation of radioactivity was interrupted, and sulfation was initiated, by the addition of unlabeled UDP-glucuronic acid and 3-phosphoadenylylsulfate, respectively. |
T5 |
464-606 |
Sentence |
denotes |
After varying periods of incubation with the nucleotide sulfate, polysaccharide was isolated and analyzed by chromatography on DEAE-cellulose. |
T6 |
607-862 |
Sentence |
denotes |
During incubation with 3-phosphoadenylylsulfate, sulfated 14C-polysaccharides were formed, while the nonsulfated 14C-polysaccharide was eliminated, each type of component retaining the same elution position throughout the entire sulfation period (60 min). |
T7 |
863-917 |
Sentence |
denotes |
No accumulation of low sulfated material was observed. |
T8 |
918-986 |
Sentence |
denotes |
Fully sulfated heparin was detected after only 0.5 min of sulfation. |
T9 |
987-1124 |
Sentence |
denotes |
These results suggest that the sulfation of heparin is a rapid process, involving a limited number of polysaccharide molecules at a time. |
T10 |
1125-1344 |
Sentence |
denotes |
Besides heparin-like products, having both N- and O-sulfate groups, and [14C]iduronic acid as predominant uronic acid constituent, an additional sulfated component was detected, having N-sulfate but no O-sulfate groups. |
T11 |
1345-1438 |
Sentence |
denotes |
This novel polysaccharide contained [14C]glucuronic acid but little or no [14C]iduronic acid. |
T12 |
1439-1675 |
Sentence |
denotes |
Previous studies have shown that L-iduronic acid residues in heparin are formed by C-5 inversion of D-glucuronic acid units, previously incorporated into the polymer; the inversion reaction requires concomitant sulfation of the polymer. |
T13 |
1676-1800 |
Sentence |
denotes |
The present results demonstrate that the formation of iduronic acid residues is related to the sulfation of hydroxyl groups. |
T14 |
1801-2016 |
Sentence |
denotes |
Pulse-chase experiments with 3-phosphoadenylyl[35S]sulfate indicated that the N-sulfated polymer, lacking O-sulfate groups, could be converted into heparin-like products by further sulfation of hydroxyl groups only. |
T15 |
2017-2170 |
Sentence |
denotes |
The biosynthesis of heparin may thus involve a pathway, in which the formation of N-sulfated intermediates precedes the introduction of O-sulfate groups. |
T1 |
0-24 |
Sentence |
denotes |
Biosynthesis of heparin. |
T2 |
25-69 |
Sentence |
denotes |
Studies on the microsomal sulfation process. |
T3 |
70-262 |
Sentence |
denotes |
Nonsulfated, partially N-deacetylated, 14C-labeled polysaccharide was formed by incubation of a mouse mastocytoma microsomal fraction with UDP-[14C]glucuronic acid and UDP-N-acetylglucosamine. |
T4 |
263-463 |
Sentence |
denotes |
After 60 min at 37 degrees the incorporation of radioactivity was interrupted, and sulfation was initiated, by the addition of unlabeled UDP-glucuronic acid and 3-phosphoadenylylsulfate, respectively. |
T5 |
464-606 |
Sentence |
denotes |
After varying periods of incubation with the nucleotide sulfate, polysaccharide was isolated and analyzed by chromatography on DEAE-cellulose. |
T6 |
607-862 |
Sentence |
denotes |
During incubation with 3-phosphoadenylylsulfate, sulfated 14C-polysaccharides were formed, while the nonsulfated 14C-polysaccharide was eliminated, each type of component retaining the same elution position throughout the entire sulfation period (60 min). |
T7 |
863-917 |
Sentence |
denotes |
No accumulation of low sulfated material was observed. |
T8 |
918-986 |
Sentence |
denotes |
Fully sulfated heparin was detected after only 0.5 min of sulfation. |
T9 |
987-1124 |
Sentence |
denotes |
These results suggest that the sulfation of heparin is a rapid process, involving a limited number of polysaccharide molecules at a time. |
T10 |
1125-1344 |
Sentence |
denotes |
Besides heparin-like products, having both N- and O-sulfate groups, and [14C]iduronic acid as predominant uronic acid constituent, an additional sulfated component was detected, having N-sulfate but no O-sulfate groups. |
T11 |
1345-1438 |
Sentence |
denotes |
This novel polysaccharide contained [14C]glucuronic acid but little or no [14C]iduronic acid. |
T12 |
1439-1675 |
Sentence |
denotes |
Previous studies have shown that L-iduronic acid residues in heparin are formed by C-5 inversion of D-glucuronic acid units, previously incorporated into the polymer; the inversion reaction requires concomitant sulfation of the polymer. |
T13 |
1676-1800 |
Sentence |
denotes |
The present results demonstrate that the formation of iduronic acid residues is related to the sulfation of hydroxyl groups. |
T14 |
1801-2016 |
Sentence |
denotes |
Pulse-chase experiments with 3-phosphoadenylyl[35S]sulfate indicated that the N-sulfated polymer, lacking O-sulfate groups, could be converted into heparin-like products by further sulfation of hydroxyl groups only. |
T15 |
2017-2170 |
Sentence |
denotes |
The biosynthesis of heparin may thus involve a pathway, in which the formation of N-sulfated intermediates precedes the introduction of O-sulfate groups. |