4d8l

Structural highlights

Function

LIGI_SPHSK Contributes to the degradation of lignin at the level of the protocatechuate 4,5-cleavage pathway (PubMed:9864312). Catalyzes the hydrolysis of 2-pyrone-4,6-dicarboxylate (PDC) to (4E)-oxalomesaconate (OMA) (PubMed:29658701, PubMed:22475079). The keto form of OMA can tautomerize into the enol form, 4-carboxy-2-hydroxymuconate (CHM), under certain pH conditions (PubMed:22475079). Also catalyzes the reverse reaction (PubMed:22475079, PubMed:9864312). Is essential for the growth of Sphingobium sp. SYK-6 on vanillate but is not responsible for the growth of this strain on syringate (PubMed:9864312).^{[1] [2] [3]}

References

1. ↑ Hobbs ME, Malashkevich V, Williams HJ, Xu C, Sauder JM, Burley SK, Almo SC, Raushel FM. Structure and Catalytic Mechanism of LigI: Insight into the Amidohydrolase Enzymes of cog3618 and Lignin Degradation. Biochemistry. 2012 Apr 9. PMID:22475079 doi:http://dx.doi.org/10.1021/bi300307b
2. ↑ Hogancamp TN, Raushel FM. Functional Annotation of LigU as a 1,3-Allylic Isomerase during the Degradation of Lignin in the Protocatechuate 4,5-Cleavage Pathway from the Soil Bacterium Sphingobium sp. SYK-6. Biochemistry. 2018 May 15;57(19):2837-2845. doi: 10.1021/acs.biochem.8b00295., Epub 2018 Apr 27. PMID:29658701 doi:http://dx.doi.org/10.1021/acs.biochem.8b00295
3. ↑ Masai E, Shinohara S, Hara H, Nishikawa S, Katayama Y, Fukuda M. Genetic and biochemical characterization of a 2-pyrone-4, 6-dicarboxylic acid hydrolase involved in the protocatechuate 4, 5-cleavage pathway of Sphingomonas paucimobilis SYK-6. J Bacteriol. 1999 Jan;181(1):55-62. PMID:9864312