7SNB

The X-ray crystal structure of the N-terminal domain of Staphylococcus aureus Fatty Acid Kinase A (FakA, residues 1-208) in complex with AMP and ADP to 1.105 Angstrom resolution

Summary for 7SNB

• Entry DOI: 10.2210/pdb7snb/pdb
• Related: 7RM7
• Descriptor: Fatty Acid Kinase A, GLYCEROL, ADENOSINE MONOPHOSPHATE, ... (6 entities in total)
• Functional Keywords: fatty acid kinase a, phosphorylation, fatty acid, n-terminus domain, ligase
• Biological source: Staphylococcus aureus
• Total number of polymer chains: 1
• Total formula weight: 25501.61

Authors

Cuypers, M.G.,Subramanian, C.,Rock, C.O.,White, S.W. (deposition date: 2021-10-27, release date: 2022-03-02, Last modification date: 2025-02-26)

Primary citation

Subramanian, C.,Cuypers, M.G.,Radka, C.D.,White, S.W.,Rock, C.O.
Domain architecture and catalysis of the Staphylococcus aureus fatty acid kinase.
J.Biol.Chem., 298:101993-101993, 2022

PubMed Abstract: Fatty acid kinase (Fak) is a two-component enzyme that generates acyl-phosphate for phospholipid synthesis. Fak consists of a kinase domain protein (FakA) that phosphorylates a fatty acid enveloped by a fatty acid binding protein (FakB). The structural basis for FakB function has been established, but little is known about FakA. Here, we used limited proteolysis to define three separate FakA domains: the amino terminal FakA_N, the central FakA_L, and the carboxy terminal FakA_C. The isolated domains lack kinase activity, but activity is restored when FakA_N and FakA_L are present individually or connected as FakA_NL. The X-ray structure of the monomeric FakA_N captures the product complex with ADP and two Mg ions bound at the nucleotide site. The FakA_L domain encodes the dimerization interface along with conserved catalytic residues Cys240, His282, and His284. AlphaFold analysis of FakA_L predicts the catalytic residues are spatially clustered and pointing away from the dimerization surface. Furthermore, the X-ray structure of FakA_C shows that it consists of two subdomains that are structurally related to FakB. Analytical ultracentrifugation demonstrates that FakA_C binds FakB, and site-directed mutagenesis confirms that a positively charged wedge on FakB meshes with a negatively charged groove on FakA_C. Finally, small angle X-ray scattering analysis is consistent with freely rotating FakA_N and FakA_C domains tethered by flexible linkers to FakA_L. These data reveal specific roles for the three independently folded FakA protein domains in substrate binding and catalysis.

PubMed: 35490779
DOI: 10.1016/j.jbc.2022.101993

Experimental method

X-RAY DIFFRACTION (1.11 Å)