4ISB

Crystal Structure of Apo Mtb FadD10

Summary for 4ISB

• Entry DOI: 10.2210/pdb4isb/pdb
• Related: 4IR7
• Descriptor: Long chain fatty acid CoA ligase FadD10, SULFATE ION (3 entities in total)
• Functional Keywords: structural genomics, tb structural genomics consortium, tbsgc, fatty acyl-acyl carrier protein synthetase, transferase, ligase
• Biological source: Mycobacterium tuberculosis
• Total number of polymer chains: 2
• Total formula weight: 114777.12

Authors

Liu, Z.,Wang, F.,Sacchettini, J.C.,TB Structural Genomics Consortium (TBSGC) (deposition date: 2013-01-16, release date: 2013-05-08, Last modification date: 2017-11-15)

Primary citation

Liu, Z.,Ioerger, T.R.,Wang, F.,Sacchettini, J.C.
Structures of Mycobacterium tuberculosis FadD10 protein reveal a new type of adenylate-forming enzyme.
J.Biol.Chem., 288:18473-18483, 2013

PubMed Abstract: Mycobacterium tuberculosis has a group of 34 FadD proteins that belong to the adenylate-forming superfamily. They are classified as either fatty acyl-AMP ligases (FAALs) or fatty acyl-CoA ligases based on sequence analysis. FadD10, involved in the synthesis of a virulence-related lipopeptide, was mis-annotated as a fatty acyl-CoA ligase; however, it is in fact a FAAL that transfers fatty acids to an acyl carrier protein (Rv0100). In this study, we have determined the structures of FadD10 in both the apo-form and the complexed form with dodecanoyl-AMP, where we see for the first time an adenylate-forming enzyme that does not adopt a closed conformation for catalysis. Indeed, this novel conformation of FadD10, facilitated by its unique inter-domain and intermolecular interactions, is critical for the enzyme to carry out the acyl transfer onto Rv0100 rather than coenzyme A. This contradicts the existing model of FAALs that rely on an insertion motif for the acyltransferase specificity and thus makes FadD10 a new type of FAAL. We have also characterized the fatty acid preference of FadD10 through biological and structural analyses, and the data indicate long chain saturated fatty acids as the biological substrates of the enzyme.

PubMed: 23625916
DOI: 10.1074/jbc.M113.466912

Experimental method

X-RAY DIFFRACTION (2.2 Å)