5W7F
Murine acyloxyacyl hydrolase (AOAH), S262A mutant, with lipid A
Summary for 5W7F
| Entry DOI | 10.2210/pdb5w7f/pdb |
| Descriptor | Acyloxyacyl hydrolase, CALCIUM ION, 2-acetamido-2-deoxy-beta-D-glucopyranose, ... (7 entities in total) |
| Functional Keywords | lipopolysaccharide, lps, gdsl esterase, saposin, hydrolase |
| Biological source | Mus musculus (Mouse) |
| Total number of polymer chains | 2 |
| Total formula weight | 129819.78 |
| Authors | Gorelik, A.,Illes, K.,Nagar, B. (deposition date: 2017-06-19, release date: 2018-01-03, Last modification date: 2020-07-29) |
| Primary citation | Gorelik, A.,Illes, K.,Nagar, B. Crystal structure of the mammalian lipopolysaccharide detoxifier. Proc. Natl. Acad. Sci. U.S.A., 115:E896-E905, 2018 Cited by PubMed Abstract: LPS is a potent bacterial endotoxin that triggers the innate immune system. Proper recognition of LPS by pattern-recognition receptors requires a full complement of typically six acyl chains in the lipid portion. Acyloxyacyl hydrolase (AOAH) is a host enzyme that removes secondary (acyloxyacyl-linked) fatty acids from LPS, rendering it immunologically inert. This activity is critical for recovery from immune tolerance that follows Gram-negative infection. To understand the molecular mechanism of AOAH function, we determined its crystal structure and its complex with LPS. The substrate's lipid moiety is accommodated in a large hydrophobic pocket formed by the saposin and catalytic domains with a secondary acyl chain inserted into a narrow lateral hydrophobic tunnel at the active site. The enzyme establishes dispensable contacts with the phosphate groups of LPS but does not interact with its oligosaccharide portion. Proteolytic processing allows movement of an amphipathic helix possibly involved in substrate access at membranes. PubMed: 29343645DOI: 10.1073/pnas.1719834115 PDB entries with the same primary citation |
| Experimental method | X-RAY DIFFRACTION (2.8 Å) |
Structure validation
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