PDBsum entry 1ox0

Go to PDB code: 
protein metals links
Transferase PDB id
Protein chain
414 a.a. *
_MG ×2
Waters ×325
* Residue conservation analysis
PDB id:
Name: Transferase
Title: The crystal structure of beta-ketoacyl-[acyl carrier protein ii from streptococcus pneumoniae
Structure: Beta ketoacyl-acyl carrier protein synthase. Chain: a. Synonym: beta ketoacyl-acyl carrier protein synthase ii. Engineered: yes
Source: Streptococcus pneumoniae. Organism_taxid: 1313. Strain: rn4220. Expressed in: escherichia coli. Expression_system_taxid: 562
Biol. unit: Dimer (from PDB file)
1.30Å     R-factor:   0.138     R-free:   0.160
Authors: A.C.Price,C.O.Rock,S.W.White
Key ref: A.C.Price et al. (2003). The 1.3-Angstrom-resolution crystal structure of beta-ketoacyl-acyl carrier protein synthase II from Streptococcus pneumoniae. J Bacteriol, 185, 4136-4143. PubMed id: 12837788
31-Mar-03     Release date:   22-Apr-03    
Go to PROCHECK summary

Protein chain
Pfam   ArchSchema ?
Q9FBC2  (Q9FBC2_STRPN) -  3-oxoacyl-[acyl-carrier-protein] synthase 2
411 a.a.
414 a.a.
Key:    PfamA domain  Secondary structure  CATH domain

 Enzyme reactions 
   Enzyme class: E.C.  - Beta-ketoacyl-[acyl-carrier-protein] synthase Ii.
[IntEnz]   [ExPASy]   [KEGG]   [BRENDA]
      Reaction: (Z)-hexadec-11-enoyl-[acyl-carrier-protein] + malonyl-[acyl-carrier- protein] = (Z)-3-oxooctadec-13-enoyl-[acyl-carrier-protein] + CO2 + [acyl-carrier-protein]
+ malonyl-[acyl-carrier- protein]
= (Z)-3-oxooctadec-13-enoyl-[acyl-carrier-protein]
+ CO(2)
+ [acyl-carrier-protein]
Molecule diagrams generated from .mol files obtained from the KEGG ftp site
 Gene Ontology (GO) functional annotation 
  GO annot!
  Biological process     metabolic process   2 terms 
  Biochemical function     catalytic activity     6 terms  


J Bacteriol 185:4136-4143 (2003)
PubMed id: 12837788  
The 1.3-Angstrom-resolution crystal structure of beta-ketoacyl-acyl carrier protein synthase II from Streptococcus pneumoniae.
A.C.Price, C.O.Rock, S.W.White.
The beta-ketoacyl-acyl carrier protein synthases are members of the thiolase superfamily and are key regulators of bacterial fatty acid synthesis. As essential components of the bacterial lipid metabolic pathway, they are an attractive target for antibacterial drug discovery. We have determined the 1.3 A resolution crystal structure of the beta-ketoacyl-acyl carrier protein synthase II (FabF) from the pathogenic organism Streptococcus pneumoniae. The protein adopts a duplicated betaalphabetaalphabetaalphabetabeta fold, which is characteristic of the thiolase superfamily. The two-fold pseudosymmetry is broken by the presence of distinct insertions in the two halves of the protein. These insertions have evolved to bind the specific substrates of this particular member of the thiolase superfamily. Docking of the pantetheine moiety of the substrate identifies the loop regions involved in substrate binding and indicates roles for specific, conserved residues in the substrate binding tunnel. The active site triad of this superfamily is present in spFabF as His 303, His 337, and Cys 164. Near the active site is an ion pair, Glu 346 and Lys 332, that is conserved in the condensing enzymes but is unusual in our structure in being stabilized by an Mg(2+) ion which interacts with Glu 346. The active site histidines interact asymmetrically with Lys 332, whose positive charge is closer to His 303, and we propose a specific role for the lysine in polarizing the imidazole ring of this histidine. This asymmetry suggests that the two histidines have unequal roles in catalysis and provides new insights into the catalytic mechanisms of these enzymes.

Literature references that cite this PDB file's key reference

  PubMed id Reference
19362634 S.C.Tsai, and B.D.Ames (2009).
Structural enzymology of polyketide synthases.
  Methods Enzymol, 459, 17-47.  
  18453702 B.Bagautdinov, Y.Ukita, M.Miyano, and N.Kunishima (2008).
Structure of 3-oxoacyl-(acyl-carrier protein) synthase II from Thermus thermophilus HB8.
  Acta Crystallogr Sect F Struct Biol Cryst Commun, 64, 358-366.
PDB code: 1j3n
18384517 G.E.Schujman, S.Altabe, and Mendoza (2008).
A malonyl-CoA-dependent switch in the bacterial response to a dysfunction of lipid metabolism.
  Mol Microbiol, 68, 987-996.  
18219113 G.Parthasarathy, R.Cummings, J.W.Becker, and S.M.Soisson (2008).
Surface-entropy reduction approaches to manipulate crystal forms of beta-ketoacyl acyl carrier protein synthase II from Streptococcus pneumoniae.
  Acta Crystallogr D Biol Crystallogr, 64, 141-148.
PDB code: 2rjt
17242430 C.E.Christensen, B.B.Kragelund, P.von Wettstein-Knowles, and A.Henriksen (2007).
Structure of the human beta-ketoacyl [ACP] synthase from the mitochondrial type II fatty acid synthase.
  Protein Sci, 16, 261-272.
PDB codes: 2iwy 2iwz 2ix4
17898897 S.Smith, and S.C.Tsai (2007).
The type I fatty acid and polyketide synthases: a tale of two megasynthases.
  Nat Prod Rep, 24, 1041-1072.  
17174327 S.Sridharan, L.Wang, A.K.Brown, L.G.Dover, L.Kremer, G.S.Besra, and J.C.Sacchettini (2007).
X-ray crystal structure of Mycobacterium tuberculosis beta-ketoacyl acyl carrier protein synthase II (mtKasB).
  J Mol Biol, 366, 469-480.
PDB code: 2gp6
16356722 A.M.Haapalainen, G.Meriläinen, and R.K.Wierenga (2006).
The thiolase superfamily: condensing enzymes with diverse reaction specificities.
  Trends Biochem Sci, 31, 64-71.  
16710404 E.D.Brown (2006).
Microbiology: antibiotic stops 'ping-pong' match.
  Nature, 441, 293-294.  
16441657 P.von Wettstein-Knowles, J.G.Olsen, K.A.McGuire, and A.Henriksen (2006).
Fatty acid synthesis. Role of active site histidines and lysine in Cys-His-His-type beta-ketoacyl-acyl carrier protein synthases.
  FEBS J, 273, 695-710.
PDB codes: 1h4f 2buh 2bui 2byw 2byx 2byy 2byz 2bz3 2bz4
15952903 S.W.White, J.Zheng, Y.M.Zhang, and Rock (2005).
The structural biology of type II fatty acid biosynthesis.
  Annu Rev Biochem, 74, 791-831.  
15016358 A.C.Price, Y.M.Zhang, C.O.Rock, and S.W.White (2004).
Cofactor-induced conformational rearrangements establish a catalytically competent active site and a proton relay conduit in FabG.
  Structure, 12, 417-428.
PDB codes: 1q7b 1q7c
15052334 Y.J.Lu, Y.M.Zhang, and C.O.Rock (2004).
Product diversity and regulation of type II fatty acid synthases.
  Biochem Cell Biol, 82, 145-155.  
The most recent references are shown first. Citation data come partly from CiteXplore and partly from an automated harvesting procedure. Note that this is likely to be only a partial list as not all journals are covered by either method. However, we are continually building up the citation data so more and more references will be included with time. Where a reference describes a PDB structure, the PDB code is shown on the right.