3NE3

Mycobacterium tuberculosis Acyl Carrier Protein Synthase Apo structure

Summary for 3NE3

• Entry DOI: 10.2210/pdb3ne3/pdb
• Related: 3NE1 3NE9 3NFD
• Descriptor: Holo-[acyl-carrier-protein] synthase (2 entities in total)
• Functional Keywords: acyl carrier protein synthase, acyl carrier protein, fatty acid synthase, acps, mycobacterium tuberculosis structural proteomics project, transferase, structural genomics, xmtb
• Biological source: Mycobacterium tuberculosis
• Total number of polymer chains: 1
• Total formula weight: 14019.76

Authors

Gokulan, K.,Mycobacterium Tuberculosis Structural Proteomics Project (XMTB) (deposition date: 2010-06-08, release date: 2010-07-28, Last modification date: 2024-02-21)

Primary citation

Gokulan, K.,Aggarwal, A.,Shipman, L.,Besra, G.S.,Sacchettini, J.C.
Mycobacterium tuberculosis acyl carrier protein synthase adopts two different pH-dependent structural conformations.
Acta Crystallogr.,Sect.D, 67:657-669, 2011

PubMed Abstract: The crystal structures of acyl carrier protein synthase (AcpS) from Mycobacterium tuberculosis (Mtb) and Corynebacterium ammoniagenes determined at pH 5.3 and pH 6.5, respectively, are reported. Comparison of the Mtb apo-AcpS structure with the recently reported structure of the Mtb AcpS-ADP complex revealed that AcpS adopts two different conformations: the orthorhombic and trigonal space-group structures show structural differences in the α2 helix and in the conformation of the α3-α4 connecting loop, which is in a closed conformation. The apo-AcpS structure shows electron density for the entire model and was obtained at lower pH values (4.4-6.0). In contrast, at a higher pH value (6.5) AcpS undergoes significant conformational changes, resulting in disordered regions that show no electron density in the AcpS model. The solved structures also reveal that C. ammoniagenes AcpS undergoes structural rearrangement in two regions, similar to the recently reported Mtb AcpS-ADP complex structure. In vitro reconstitution experiments show that AcpS has a higher post-translational modification activity between pH 4.4 and 6.0 than at pH values above 6.5, where the activity drops owing to the change in conformation. The results show that apo-AcpS and AcpS-ADP adopt different conformations depending upon the pH conditions of the crystallization solution.

PubMed: 21697604
DOI: 10.1107/S0907444911020221

Experimental method

X-RAY DIFFRACTION (1.9 Å)