7DNP | pdb_00007dnp

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This is version 1.3 of the entry. See complete history.

(2021) Mol Cells 44: 517-528

PubMed Abstract:
A recent genetic study with Brucella abortus revealed the secretion activator gene A (SagA) as an autolysin component creating pores in the peptidoglycan (PGN) layer for the type IV secretion system (T4SS) and peptidoglycan hydrolase inhibitor A (PhiA) as an inhibitor of SagA. In this study, we determined the crystal structures of both SagA and PhiA. Notably, the SagA structure contained a PGN fragment in a space between the N- and C-terminal domains, showing the substrate-dependent hinge motion of the domains. The purified SagA fully hydrolyzed the meso-diaminopimelic acid (DAP)-type PGN, showing a higher activity than hen egg-white lysozyme. The PhiA protein exhibiting tetrameric assembly failed to inhibit SagA activity in our experiments. Our findings provide implications for the molecular basis of the SagA-PhiA system of B. abortus . The development of inhibitors of SagA would further contribute to controlling brucellosis by attenuating the function of T4SS, the major virulence factor of Brucella .

Organizational Affiliation

Department of Agricultural Biotechnology, Research Institute for Agriculture and Life Sciences, Center for Food and Bioconvergence, CALS, Seoul National University, Seoul 08826, Korea.

Macromolecule Content

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| 3D Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Secretion activator protein, hypothetical	A	182	Brucella abortus bv. 1 str. 9-941	Mutation(s): 0 Gene Names: BruAb1_0990
UniProt
Find proteins for Q57DE3 (Brucella abortus biovar 1 (strain 9-941)) Explore Q57DE3 Go to UniProtKB: Q57DE3
Entity Groups
Sequence Clusters	30% Identity 50% Identity 70% Identity 90% Identity 95% Identity 100% Identity
UniProt Group	Q57DE3
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Reference Sequence

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram	3D Interactions
H9U (Subject of Investigation/LOI) Query on H9U Download:Ideal Coordinates CCD File SDF format, chain B [auth A] MOL2 format, chain B [auth A] mmCIF format, chain B [auth A]	B [auth A]	(2R)-2-[[(2S)-2-[[(2R)-2-[(2R,3S,4R,5R,6S)-5-acetamido-3-[(2S,3R,4R,5S,6R)-3-acetamido-6-(hydroxymethyl)-4,5-bis(oxidanyl)oxan-2-yl]oxy-2-(hydroxymethyl)-6-oxidanyl-oxan-4-yl]oxypropanoyl]amino]propanoyl]amino]pentanedioic acid C₂₇ H₄₄ N₄ O₁₇ ZIRNZNIZUAXLNB-XNKNRSQBSA-N		Interactions Focus chain B [auth A] Interactions & Density Focus chain B [auth A]