Title of article :
A Bacillus licheniformis pectin acetylesterase is specific for homogalacturonans acetylated at O-3
Author/Authors :
Remoroza، نويسنده , , Elyse C. and Wagenknecht، نويسنده , , M. and Gu، نويسنده , , F. and Buchholt، نويسنده , , H.C. and Moerschbacher، نويسنده , , B.M. and Schols، نويسنده , , H.A. and Gruppen، نويسنده , , H.، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2014
Pages :
9
From page :
85
To page :
93
Abstract :
A recombinant acetylesterase from Bacillus licheniformis DSM13, belonging to carbohydrate esterase family 12, was purified and biochemically characterized. The purified enzyme, termed BliPAE, was capable of deacetylating acetylated pectins, e.g. sugar beet pectin (SBP). Contrary to its provisional annotation as rhamnogalacturonan acetylesterase, the enzyme specifically removed acetyl groups from the homogalacturonan region classifying it as a PAE. The recombinant enzyme has a molecular mass of 26.7 kDa and shows optimal activity at pH 8.0 and 50 °C. It is stable in the range pH 5.0–7.0 and below 50 °C. Methylesterification of the galacturonic acid (GalA) moieties reduces the deacetylation efficacy of BliPAE. The enzyme efficiently removes acetyl groups from SBPs with low degree of methylesterification (DM) 9-30, releasing about 75% of the acetyl groups present in the homogalacturonan. Furthermore, 1H NMR of polymer and LC-HILIC-MSn after endo-PGII and PL degradation were used to structurally characterize the BliPAE-modified pectins. The results show that BliPAE removes acetyl groups specifically when substituted at the O-3 position of GalA moieties.
Keywords :
Pectin lyase , Sugar beet pectin , NMR , HILIC-MS/ELSD , Endo-polygalacturonase
Journal title :
CARBOHYDRATE POLYMERS
Serial Year :
2014
Journal title :
CARBOHYDRATE POLYMERS
Record number :
1626382
Link To Document :
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