3pic | pdb_00003pic
Glucuronoyl Esterase catalytic domain (Cip2_GE) from Hypocrea jecorina
Structural highlights
FunctionGCE_HYPJQ Glucuronoyl esterase which may play a significant role in biomass degradation, as it is considered to disconnect hemicellulose from lignin through the hydrolysis of the ester bond between 4-O-methyl-D-glucuronic acid residues of glucuronoxylans and aromatic alcohols of lignin. Does not hydrolyze substrates of other carbohydrate esterases such as acetylxylan esterase, acetyl esterase and feruloyl esterase.[1] [2] Publication Abstract from PubMedThe structure of the catalytic domain of glucuronoyl esterase Cip2 from the fungus H. jecorina was determined at a resolution of 1.9 A. This is the first structure of the newly established carbohydrate esterase family 15. The structure has revealed the residues Ser278-His411-Glu301 present in a triad arrangement as the active site. Ser278 is present in the novel consensus sequence GCSRXG reported earlier in the members of CE-15 family. The active site is exposed on the surface of the protein which has implications for the ability of the enzyme to hydrolyze ester bonds of large substrates. Efforts are underway to obtain crystals of Cip2_GE complexed with inhibitor and synthetic substrates. The activity of the glucuronoyl esterase could play a significant role in plant biomass degradation as its expected role is to separate the lignin from hemicelluloses by hydrolysis of the ester bond between 4-O-methyl-D-glucuronic acid moieties of glucuronoxylans and aromatic alcohols of lignin. Structure of the catalytic domain of glucuronoyl esterase Cip2 from Hypocrea jecorina.,Pokkuluri PR, Duke NE, Wood SJ, Cotta MA, Li XL, Biely P, Schiffer M Proteins. 2011 Aug;79(8):2588-92. doi: 10.1002/prot.23088. Epub 2011 Jun 9. PMID:21661060[3] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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