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Proteomic analysis of curdlan-producing Agrobacterium sp. in response to pH downshift

Paper ID Volume ID Publish Year Pages File Format Full-Text
24732 43533 2008 8 PDF Available
Title
Proteomic analysis of curdlan-producing Agrobacterium sp. in response to pH downshift
Abstract

During batch cultivation of Agrobacterium sp. ATCC 31750, proteome analysis in response to a pH downshift from 7.0 to 5.5 was carried out using two-dimensional electrophoresis and matrix-assisted laser desorption-ionization-time of flight mass spectrometry. When the pH of the exponentially growing Agrobacterium sp. culture was downshifted to pH 5.5, the synthesis level of 27 intracellular proteins showed significant changes in level over a prolonged period of time compared with the batch culture controlled at pH 7.0. In particular, the intracellular protein level of the β-1,3-glucan synthase catalytic subunit, UTP-glucose-1-phosphate uridylyltransferase, and phosphoglucomutase, which are key metabolic enzymes in the curdlan biosynthesis pathway, were more than 10-, 3- and 17-times higher in the low pH culture. On the other hand, the level of orotidine5-phosphate decarboxylase (conversion of OMP to UMP) was significantly up-regulated after pH downshift. The accumulation of UMP may direct the metabolic flow towards the biosynthetic route of UTP, which is a key metabolic precursor for UDP-glucose. Therefore, it is possible that increase of cellular metabolic enzymes during pH downshift culture can enhance the metabolic flux of the biosynthesis of key precursor, such as UTP- and UDP-glucose, resulting in an increase in curdlan biosynthesis.

Keywords
Agrobacterium sp.; Curdlan biosynthesis; pH downshift; Two-dimensional gel electrophoresis; Proteomic responses; Metabolic characteristics
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Proteomic analysis of curdlan-producing Agrobacterium sp. in response to pH downshift
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Biotechnology - Volume 138, Issues 3–4, 25 November 2008, Pages 80–87
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