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6NWR

Thioester acyl-intermediate of Apolipoprotein N-acyltransferase (Lnt)

Summary for 6NWR
Entry DOI10.2210/pdb6nwr/pdb
Related6Q3A
DescriptorApolipoprotein N-acyltransferase, DODECYL-BETA-D-MALTOSIDE, DODECANE, ... (4 entities in total)
Functional Keywordsenzyme, nitrilase, n-acyltransferase, lipoprotein, membrane protein
Biological sourceEscherichia coli (strain K12)
More
Total number of polymer chains2
Total formula weight119917.48
Authors
Wiseman, B.,Hogbom, M. (deposition date: 2019-02-07, release date: 2020-01-29, Last modification date: 2023-10-11)
Primary citationWiseman, B.,Hogbom, M.
Conformational changes in Apolipoprotein N-acyltransferase (Lnt).
Sci Rep, 10:639-639, 2020
Cited by
PubMed Abstract: Lipoproteins are important components of the cell envelope and are responsible for many essential cellular functions. They are produced by the post-translational covalent attachment of lipids that occurs via a sequential 3-step process controlled by three integral membrane enzymes. The last step of this process, unique to Gram-negative bacteria, is the N-acylation of the terminal cysteine by Apolipoprotein N-acyltransferase (Lnt) to form the final mature lipoprotein. Here we report 2 crystal forms of Lnt from Escherichia coli. In one form we observe a highly dynamic arm that is able to restrict access to the active site as well as a covalent modification to the active site cysteine consistent with the thioester acyl-intermediate. In the second form, the enzyme crystallized in an open conformation exposing the active site to the environment. In total we observe 3 unique Lnt molecules that when taken together suggest the movement of essential loops and residues are triggered by substrate binding that could control the interaction between Lnt and the incoming substrate apolipoprotein. The results provide a dynamic context for residues shown to be central for Lnt function and provide further insights into its mechanism.
PubMed: 31959792
DOI: 10.1038/s41598-020-57419-7
PDB entries with the same primary citation
Experimental method
X-RAY DIFFRACTION (3.5 Å)
Structure validation

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