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Purification and characterization of a new bioscouring pectate lyase from Bacillus pumilus BK2

Paper ID Volume ID Publish Year Pages File Format Full-Text
25768 43597 2006 12 PDF Available
Title
Purification and characterization of a new bioscouring pectate lyase from Bacillus pumilus BK2
Abstract

An alkalophilic bacterium was isolated based on the potential of extra-cellular enzymes for bioscouring. The bacterium was identified as a new strain of Bacillus pumilus BK2 producing an extra-cellular endo-pectate lyase PL (EC 4.2.2.2). PL was purified to homogeneity in three steps and has a molecular mass of 37.3 ± 4.8 kDa as determined by SDS-PAGE and an isoelectric point of pH 8.5. Peptide mass mapping by nano-LC–MS of PL revealed 15% homology with a pectate lyase from Bacillus sp. The pectate lyase exhibited optimum activity at pH 8.5 and around 70 °C in Tris/HCl buffer. It showed a half-life at 30 °C of more than 75 h. Stability decreased with increasing temperature, extremely over 60 °C. The enzyme did not require Ca2+ ions for activity, and was strongly inhibited by EDTA and Co2+.PL was active on polygalacturonic acid and esterified pectin, but the affinity showed a maximum for intermediate esterified pectins and decreased over a value of 50% of esterification. The best substrate was 29.5% methylated pectin. PL cleaved polygalacturonic acid via a β-elimination mechanism as shown by NMR analysis. PL released unsaturated tetragalacturonic acid from citrus pectin and polygalacturonic acid, but did not show any side activities on other hemicelluloses. On polygalacturonic acid PL showed a Km of 0.24 g l−1 and a vmaxvmax of 0.72 g l−1 min−1. The applicability of pectate lyase for the bioscouring process was tested on a cotton fabric. Removal of up to 80% of pectin was proven by means of ruthenium red dyeing and HPAEC (65%). Structural contact angle measurements clearly indicated the increased hydrophilicity of enzyme treated fabrics.

Keywords
Bioscouring; Pectate lyase; Bacillus pumilus
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Purification and characterization of a new bioscouring pectate lyase from Bacillus pumilus BK2
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Biotechnology - Volume 121, Issue 3, 10 February 2006, Pages 390–401
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us