期刊
ACTA CRYSTALLOGRAPHICA SECTION D-BIOLOGICAL CRYSTALLOGRAPHY
卷 70, 期 -, 页码 658-667出版社
WILEY-BLACKWELL
DOI: 10.1107/S1399004713032240
关键词
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资金
- Russian Academy of Sciences
- Russian Foundation for Basic Research
- Program of RAS on Molecular and Cellular Biology
In eukaryotes and archaea, the heterotrimeric translation initiation factor 2 (e/aIF2) is pivotal for the delivery of methionylated initiator tRNA (Met-tRNA(i)) to the ribosome. It acts as a molecular switch that cycles between inactive (GDP-bound) and active (GTP-bound) states. Recent studies show that eIF2 can also exist in a long-lived eIF2 gamma-GDP-P-i (inorganic phosphate) active state. Here, four high-resolution crystal structures of aIF2 gamma from Sulfolobus solfataricus are reported: aIF2 gamma-GDPCP (a nonhydrolyzable GTP analogue), aIF2 gamma-GDP-formate (in which a formate ion possibly mimics P-i), aIF2 gamma-GDP and nucleotide-free aIF2 gamma. The structures describe the different states of aIF2 gamma and demonstrate the conformational transitions that take place in the aIF2 gamma 'life cycle'.
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