Crystal structure of YaeT: conformational flexibility and substrate recognition.
Crystal structure of YaeT: conformational flexibility and substrate recognition.
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DOI:
10.1016/j.str.2008.09.014
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发表时间:
2008-12-10
期刊:
影响因子:
--
通讯作者:
Sousa MC
中科院分区:
文献类型:
--
作者:
Gatzeva-Topalova PZ;Walton TA;Sousa MC
The envelope of Gram-negative bacteria consists of inner and outer membranes surrounding the peptidoglycan wall. The outer membrane (OM) is rich in integral membrane proteins (OMPs), which have a characteristic β-barrel domain embedded in the OM. The Omp85 family of proteins, ubiquitous among Gram-negative bacteria and also present in chloroplasts and mitochondria, is required for folding and insertion of OMPs into the outer membrane. Bacterial Omp85 proteins are characterized by a periplasmic domain containing five repeats of polypeptide transport-associated (POTRA) motifs. Here we report the crystal structure of a periplasmic fragment of YaeT (the E. coli Omp85) containing the first four POTRA domains in a new extended conformation consistent with recent solution X-ray scattering data. Analysis of the YaeT structure reveals conformational flexibility around a hinge point between POTRA2 and 3 domains. The structure’s implications for the substrate binding and folding mechanisms are also discussed.
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