View source for 5kcn


==Crystal Structure of full-length LpoA from Haemophilus influenzae at 1.97 angstrom resolution==
<StructureSection load='5kcn' size='340' side='right'caption='[[5kcn]], [[Resolution|resolution]] 1.96&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[5kcn]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Haemophilus_influenzae_Rd_KW20 Haemophilus influenzae Rd KW20]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5KCN OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=5KCN FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 1.965&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene></td></tr>
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=5kcn FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5kcn OCA], [https://pdbe.org/5kcn PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=5kcn RCSB], [https://www.ebi.ac.uk/pdbsum/5kcn PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=5kcn ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/LPOA_HAEIN LPOA_HAEIN] Regulator of peptidoglycan synthesis that is essential for the function of penicillin-binding protein 1A (PBP1a).
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
In many Gram-negative bacteria, the peptidoglycan synthase PBP1A requires the outer membrane lipoprotein LpoA for constructing a functional peptidoglycan required for bacterial viability. Previously, we have shown that the C-terminal domain of Haemophilus influenzae LpoA (HiLpoA) has a highly conserved, putative substrate-binding cleft between two alpha/beta lobes. Here, we report a 2.0-A-resolution crystal structure of the HiLpoA N-terminal domain. Two subdomains contain tetratricopeptide-like motifs that form a concave groove, but their relative orientation differs by ~45 degrees from that observed in an NMR structure of the Escherichia coli LpoA N domain. We also determined three 2.0-2.8-A-resolution crystal structures containing four independent full-length HiLpoA molecules. In contrast to an elongated model previously suggested for E. coli LpoA, each HiLpoA formed a U-shaped structure with a different C-domain orientation. This resulted from both N-domain twisting and rotation of the C domain (up to 30 degrees ) at the end of the relatively immobile interdomain linker. Moreover, a previously predicted hinge between the lobes of the LpoA C domain exhibited variations of up to 12 degrees . Small-angle X-ray scattering (SAXS) data revealed excellent agreement with a model calculated by normal mode analysis (NMA) from one of the full-length HiLpoA molecules, but even better agreement with an ensemble of this molecule and two of the partially extended NMA-predicted models. The different LpoA structures helped explain how an outer membrane-anchored LpoA can either withdraw from or extend toward the inner membrane-bound PBP1A through peptidoglycan gaps and hence regulate the synthesis of peptidoglycan necessary for bacterial viability.

Structural analyses of the Haemophilus influenzae peptidoglycan synthase activator LpoA suggest multiple conformations in solution.,Sathiyamoorthy K, Vijayalakshmi J, Tirupati B, Fan L, Saper MA J Biol Chem. 2017 Sep 8. pii: jbc.M117.804997. doi: 10.1074/jbc.M117.804997. PMID:28887305<ref>PMID:28887305</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 5kcn" style="background-color:#fffaf0;"></div>
== References ==
<references/>
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</StructureSection>
[[Category: Haemophilus influenzae Rd KW20]]
[[Category: Large Structures]]
[[Category: Saper MA]]
[[Category: Sathiyamoorthy K]]