Literature summary for 2.3.1.240 extracted from

Kittendorf, J.D.; Beck, B.J.; Buchholz, T.J.; Seufert, W.; Sherman, D.H.
Interrogating the molecular basis for multiple macrolactone ring formation by the pikromycin polyketide synthase (2007), Chem. Biol., 14, 944-954.

Search for more literature for 2.3.1.240

Cloned(Commentary)

Cloned (Comment)	Organism
overexpression of pikromycin modules PikAIII and PIkAIV in Escherichia coli	Streptomyces venezuelae

KM Value [mM]

KM Value [mM]	KM Value Maximum [mM]	Substrate	Comment	Organism	Structure
additional information	-	additional information	both PikAIV(DELTAAT) and PikAIV(DELTAACP) display similar apparent kcat values for 10-deoxymethynolide production, which are approximately 2fold lower than the calculated kcat from wild-type PikAIII and PikAIV. Likewise, both PikAIV mutants display similar apparent KM values that are also reduced 2fold when compared to the KM from PikAIII and PikAIV. The equivalent decrease in the apparent kinetic parameters for both mutants results in a specificity constant (kcat/KM) that is comparable to wild-type, further emphasizing the non-critical role of these catalytic domains in 10-deoxymethynolide production. Both PikAIII(DELTADock) (partial deletions of PikAIII C-terminal domain) and PikAIV(DELTADock) (partial deletion of PikAIV N-terminal docking domains) display apparent kcat values (0.044/min and 0.053/min), which are significantly decrease relative to the kcat observed with wild-type PikAIII and PikAIV. The apparent KM values for PikAIII(DELTADock) and PikAIV (DELTADock) decrease 35 fold compared to wild-type, resulting in specificity constants (kcat/KM) that are 14fold and 8fold lower, respectively. Combining PikAIII(DELTADock) and PikAIV(DELTADock) together do not result in an additional rate decrease. The kinetic parameters are comparable to those obtained when either truncated monomodule is paired with its wild-type partner	Streptomyces venezuelae

Organism

Organism	UniProt	Comment	Textmining
Streptomyces venezuelae	Q9ZGI5 and Q9ZGI4 and Q9ZGI3 and Q9ZGI2 and Q9ZGI1	Q9ZGI5: type I polyketide synthase PikAI, Q9ZGI4: type I polyketide synthase PikAII, Q9ZGI3: type I polyketide synthase PikAIII, Q9ZGI2: type I polyketide synthase PikAIV, Q9ZGI1: thioesterase II PikAV. Multifunctional, modular enzyme	-

Purification (Commentary)

Purification (Comment)	Organism
-	Streptomyces venezuelae

Synonyms

Synonyms	Comment	Organism
pikromycin polyketide synthase	-	Streptomyces venezuelae

Temperature Optimum [°C]

Temperature Optimum [°C]	Temperature Optimum Maximum [°C]	Comment	Organism
30	-	assay at	Streptomyces venezuelae

pH Optimum

pH Optimum Minimum	pH Optimum Maximum	Comment	Organism
7.2	-	assay at	Streptomyces venezuelae

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Release 2023.1 (January 2023)