| Id |
Subject |
Object |
Predicate |
Lexical cue |
| T1 |
0-61 |
Sentence |
denotes |
Cytoplasmic, nuclear, and golgi localization of RGS proteins. |
| T2 |
62-145 |
Sentence |
denotes |
Evidence for N-terminal and RGS domain sequences as intracellular targeting motifs. |
| T3 |
146-271 |
Sentence |
denotes |
RGS proteins comprise a family of proteins named for their ability to negatively regulate heterotrimeric G protein signaling. |
| T4 |
272-518 |
Sentence |
denotes |
Biochemical studies suggest that members of this protein family act as GTPase-activating proteins for certain Galpha subunits, thereby accelerating the turn-off mechanism of Galpha and terminating signaling by both Galpha and Gbetagamma subunits. |
| T5 |
519-763 |
Sentence |
denotes |
In the present study, we used confocal microscopy to examine the intracellular distribution of several RGS proteins in COS-7 cells expressing RGS-green fluorescent protein (GFP) fusion proteins and in cells expressing RGS proteins endogenously. |
| T6 |
764-871 |
Sentence |
denotes |
RGS2 and RGS10 accumulated in the nucleus of COS-7 cells transfected with GFP constructs of these proteins. |
| T7 |
872-952 |
Sentence |
denotes |
In contrast, RGS4 and RGS16 accumulated in the cytoplasm of COS-7 transfectants. |
| T8 |
953-1114 |
Sentence |
denotes |
As observed in COS-7 cells, RGS4 exhibited cytoplasmic localization in mouse neuroblastoma cells, and RGS10 exhibited nuclear localization in human glioma cells. |
| T9 |
1115-1361 |
Sentence |
denotes |
Deletion or alanine substitution of an N-terminal leucine repeat motif present in both RGS4 and RGS16, a domain identified as a nuclear export sequence in HIV Rev and other proteins, promoted nuclear localization of these proteins in COS-7 cells. |
| T10 |
1362-1565 |
Sentence |
denotes |
In agreement with this observation, treatment of mouse neuroblastoma cells with leptomycin B to inhibit nuclear protein export by exportin1 resulted in accumulation of RGS4 in the nucleus of these cells. |
| T11 |
1566-1744 |
Sentence |
denotes |
GFP fusions of RGS domains of RGS proteins localized in the nucleus, suggesting that nuclear localization of RGS proteins results from nuclear targeting via RGS domain sequences. |
| T12 |
1745-1873 |
Sentence |
denotes |
RGSZ, which shares with RGS-GAIP a cysteine-rich string in its N-terminal region, localized to the Golgi complex in COS-7 cells. |
| T13 |
1874-1987 |
Sentence |
denotes |
Deletion of the N-terminal domain of RGSZ that includes the cysteine motif promoted nuclear localization of RGSZ. |
| T14 |
1988-2060 |
Sentence |
denotes |
None of the RGS proteins examined were localized at the plasma membrane. |
| T15 |
2061-2229 |
Sentence |
denotes |
These results demonstrate that RGS proteins localize in the nucleus, the cytoplasm, or shuttle between the nucleus and cytoplasm as nucleo-cytoplasmic shuttle proteins. |
| T16 |
2230-2429 |
Sentence |
denotes |
RGS proteins localize differentially within cells as a result of structural differences among these proteins that do not appear to be important determinants for their G protein-regulating activities. |
| T17 |
2430-2542 |
Sentence |
denotes |
These findings suggest involvement of RGS proteins in more complex cellular functions than currently envisioned. |