| Id |
Subject |
Object |
Predicate |
Lexical cue |
| S1 |
0-91 |
Sentence |
denotes |
Modulation of E2F complexes during G0 to S phase transition in human primary B-lymphocytes. |
| S2 |
92-173 |
Sentence |
denotes |
The pocket protein-E2F complexes are convergence points for cell cycle signaling. |
| S3 |
174-341 |
Sentence |
denotes |
In the present report, we identified and monitored the pocket protein-E2F complexes in human primary B-lymphocytes after activation by phorbol 12-myristate 13-acetate. |
| S4 |
342-642 |
Sentence |
denotes |
Consistent with previous data from human and mouse fibroblasts and T-lymphocytes, E2F4 and DP1 form the predominant E2F heterodimers both in G0 and G1 phases of the human B-lymphocyte cell cycle, whereas E2F1 and -3 are first detected in late G1, and their expression levels increase towards S phase. |
| S5 |
643-764 |
Sentence |
denotes |
Intriguingly, the major E2F complex that we detected in quiescent human B-lymphocytes is consisted of pRB, E2F4, and DP1. |
| S6 |
765-919 |
Sentence |
denotes |
Though the levels of DP1 and -2 increase when cells progress from G0 to S, the proportion of DP1 to DP2 remains relatively constant during the cell cycle. |
| S7 |
920-1076 |
Sentence |
denotes |
We also observed an increase in electrophoretic mobility of the predominant E2F components, DP1 and E2F4, as B-lymphocytes progressed from G0 into early G1. |
| S8 |
1077-1260 |
Sentence |
denotes |
This increase in mobility was attributable to dephosphorylation, as lambda phosphatase treatment could convert the slower migrating forms into the corresponding faster mobility forms. |
| S9 |
1261-1379 |
Sentence |
denotes |
We further demonstrated that this change in phosphorylation status correlates with a decrease in DNA binding activity. |
| S10 |
1380-1746 |
Sentence |
denotes |
This modulation of DNA binding activity mediated through the dephosphorylation of DP1 and E2F4 could help to explain the lack of in vivo DNA footprinting in late G1 and S phases of gene promoters negatively regulated through E2F sites and suggests a novel mechanism for controlling E2F transcriptional activity during the transition from quiescence to proliferation. |