Abstract
Gem, a member of the Rad,Gem/Kir subfamily of small G-proteins, has unique sequence features. We report here the crystallographic structure determination of the Gem G-domain in complex with nucleotide to 2.4 Å resolution. Although the basic Ras protein fold is maintained, the Gem switch regions emphatically differ from the Ras paradigm. Our ensuing biochemical characterization indicates that Gem G-domain markedly prefers GDP over GTP. Two known functions of Gem are distinctly affected by spatially separated clusters of mutations.
Original language | English |
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Pages (from-to) | 5959-5964 |
Number of pages | 6 |
Journal | FEBS Letters |
Volume | 580 |
Issue number | 25 |
DOIs | |
State | Published - 30 Oct 2006 |
Externally published | Yes |
Bibliographical note
Funding Information:Thanks go to the staff of ID14-4 (ESRF, France) for assistance with diffraction experiments. We thank Doug Andres for generously sharing Cav β expression constructs. Preliminary studies were supported by a grant from the US–Israel Binational Science Foundation (JAH, KK). Continuing work has been funded by a grant to JAH from the Israel Cancer Research Fund and by NIH grant EY 03529 to ZS. Appendix A
Keywords
- Calcium channel
- Crystallography
- Cytoskeleton
- G-protein
- Nucleotide