PMID- 16431911
OWN - NLM
STAT- MEDLINE
DCOM- 20060613
LR  - 20131121
IS  - 0021-9258 (Print)
IS  - 0021-9258 (Linking)
VI  - 281
IP  - 16
DP  - 2006 Apr 21
TI  - Structure and activity of two metal ion-dependent acetylxylan esterases involved 
      in plant cell wall degradation reveals a close similarity to peptidoglycan
      deacetylases.
PG  - 10968-75
AB  - The enzymatic degradation of plant cell wall xylan requires the concerted action 
      of a diverse enzymatic syndicate. Among these enzymes are xylan esterases, which 
      hydrolyze the O-acetyl substituents, primarily at the O-2 position of the xylan
      backbone. All acetylxylan esterase structures described previously display a
      alpha/beta hydrolase fold with a "Ser-His-Asp" catalytic triad. Here we report
      the structures of two distinct acetylxylan esterases, those from Streptomyces
      lividans and Clostridium thermocellum, in native and complex forms, with x-ray
      data to between 1.6 and 1.0 A resolution. We show, using a novel linked assay
      system with PNP-2-O-acetylxyloside and a beta-xylosidase, that the enzymes are
      sugar-specific and metal ion-dependent and possess a single metal center with a
      chemical preference for Co2+. Asp and His side chains complete the catalytic
      machinery. Different metal ion preferences for the two enzymes may reflect the
      surprising diversity with which the metal ion coordinates residues and ligands in
      the active center environment of the S. lividans and C. thermocellum enzymes.
      These "CE4" esterases involved in plant cell wall degradation are shown to be
      closely related to the de-N-acetylases involved in chitin and peptidoglycan
      degradation (Blair, D. E., Schuettelkopf, A. W., MacRae, J. I., and Aalten, D. M.
      (2005) Proc. Natl. Acad. Sci. U. S. A., 102, 15429-15434), which form the NodB
      deacetylase "superfamily."
FAU - Taylor, Edward J
AU  - Taylor EJ
AD  - Structural Biology Laboratory, Department of Chemistry, University of York,
      Heslington, York YO10 5YW, United Kingdom.
FAU - Gloster, Tracey M
AU  - Gloster TM
FAU - Turkenburg, Johan P
AU  - Turkenburg JP
FAU - Vincent, Florence
AU  - Vincent F
FAU - Brzozowski, A Marek
AU  - Brzozowski AM
FAU - Dupont, Claude
AU  - Dupont C
FAU - Shareck, Francois
AU  - Shareck F
FAU - Centeno, Maria S J
AU  - Centeno MS
FAU - Prates, Jose A M
AU  - Prates JA
FAU - Puchart, Vladimir
AU  - Puchart V
FAU - Ferreira, Luis M A
AU  - Ferreira LM
FAU - Fontes, Carlos M G A
AU  - Fontes CM
FAU - Biely, Peter
AU  - Biely P
FAU - Davies, Gideon J
AU  - Davies GJ
LA  - eng
SI  - PDB/2C71
SI  - PDB/2C79
SI  - PDB/2CC0
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
DEP - 20060123
PL  - United States
TA  - J Biol Chem
JT  - The Journal of biological chemistry
JID - 2985121R
RN  - 0 (Carbohydrates)
RN  - 0 (Ions)
RN  - 0 (Ligands)
RN  - 0 (Metals)
RN  - 0 (Peptidoglycan)
RN  - 0 (Xylans)
RN  - 1398-61-4 (Chitin)
RN  - 30KYC7MIAI (Aspartic Acid)
RN  - 3G0H8C9362 (Cobalt)
RN  - 4QD397987E (Histidine)
RN  - 7OV03QG267 (Nickel)
RN  - EC 3.1.1.6 (Acetylesterase)
RN  - EC 3.1.1.72 (acetylxylan esterase)
RN  - EC 3.5.- (Amidohydrolases)
SB  - IM
MH  - Acetylesterase/*chemistry
MH  - Amidohydrolases/*chemistry
MH  - Aspartic Acid/chemistry
MH  - Binding Sites
MH  - Carbohydrate Metabolism
MH  - Carbohydrates/chemistry
MH  - Catalysis
MH  - Cell Wall/*metabolism
MH  - Chitin/chemistry
MH  - Clostridium thermocellum/metabolism
MH  - Cobalt/chemistry
MH  - Crystallography, X-Ray
MH  - Dimerization
MH  - Escherichia coli/metabolism
MH  - Histidine/chemistry
MH  - Ions
MH  - Ligands
MH  - Metals/chemistry
MH  - Models, Chemical
MH  - Models, Molecular
MH  - Models, Statistical
MH  - Nickel/chemistry
MH  - Peptidoglycan/*chemistry
MH  - Plants/metabolism
MH  - Protein Conformation
MH  - Protein Structure, Tertiary
MH  - Streptomyces lividans/metabolism
MH  - Structure-Activity Relationship
MH  - Xylans/chemistry
EDAT- 2006/01/25 09:00
MHDA- 2006/06/14 09:00
CRDT- 2006/01/25 09:00
PHST- 2006/01/25 09:00 [pubmed]
PHST- 2006/06/14 09:00 [medline]
PHST- 2006/01/25 09:00 [entrez]
AID - M513066200 [pii]
AID - 10.1074/jbc.M513066200 [doi]
PST - ppublish
SO  - J Biol Chem. 2006 Apr 21;281(16):10968-75. doi: 10.1074/jbc.M513066200. Epub 2006
      Jan 23.