期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 104, 期 4, 页码 1213-1218出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.0610348104
关键词
regulation; x-ray structure; P-II protein
资金
- Biotechnology and Biological Sciences Research Council [B19934] Funding Source: Medline
- Biotechnology and Biological Sciences Research Council [B19934] Funding Source: researchfish
Amt proteins are ubiquitous channels for the conduction of ammonia in archaea, eubacteria, fungi, and plants. In Escherichia coli, previous studies have indicated that binding of the P-II signal transduction protein GlnK to the ammonia channel AmtB regulates the channel thereby controlling ammonium influx in response to the intracellular nitrogen status. Here, we describe the crystal structure of the complex between AmtB and GlnK at a resolution of 2.5 angstrom. This structure of P-II in a complex with one of its targets reveals physiologically relevant conformations of both AmtB and GInK. GInK interacts with AmtB almost exclusively via a long surface loop containing Y51 (T-loop), the tip of which inserts deeply into the cytoplasmic pore exit, blocking ammonia conduction. Y51 of GInK is also buried in the pore exit, explaining why uridylylation of this residue prevents complex formation.
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