2qxz: Difference between revisions

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[[Image:2qxz.jpg|left|200px]]
{{Seed}}
[[Image:2qxz.png|left|200px]]


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{{STRUCTURE_2qxz|  PDB=2qxz  |  SCENE=  }}  
{{STRUCTURE_2qxz|  PDB=2qxz  |  SCENE=  }}  


'''pectate lyase R236F from Xanthomonas campestris'''
===pectate lyase R236F from Xanthomonas campestris===




==Overview==
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In the vast number of random mutagenesis experiments that have targeted protein thermostability, single amino acid substitutions that increase the apparent melting temperature (Tm) of the enzyme more than 1 to 2 degrees C are rare and often require the creation of a large library of mutated genes. Here we present a case where a single beneficial mutation (R236F) of a hemp fiber-processing pectate lyase of Xanthomonas campestris origin (PL(Xc)) produced a 6 degrees C increase in Tm and a 23-fold increase in the half-life at 45 degrees C without compromising the enzyme's catalytic efficiency. This success was based on a variation of sequence alignment strategy where a mesophilic amino acid sequence is matched with the sequences of its thermophilic counterparts that have established Tm values. Altogether, two-thirds of the nine targeted single amino acid substitutions were found to have effects either on the thermostability or on the catalytic activity of the enzyme, evidence of a high success rate of mutation without the creation of a large gene library and subsequent screening of clones. Combination of R236F with another beneficial mutation (A31G) resulted in at least a twofold increase in specific activity while preserving the improved Tm value. To understand the structural basis for the increased thermal stability or activity, the variant R236F and A31G R236F proteins and wild-type PL(Xc) were purified and crystallized. By structure analysis and computational methods, hydrophobic desolvation was found to be the driving force for the increased stability with R236F.
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{{ABSTRACT_PUBMED_18156340}}


==About this Structure==
==About this Structure==
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[[Category: Lyase]]
[[Category: Lyase]]
[[Category: Pectate lyase]]
[[Category: Pectate lyase]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 19:48:00 2008''

Revision as of 16:48, 28 July 2008

File:2qxz.png

Template:STRUCTURE 2qxz

pectate lyase R236F from Xanthomonas campestris

Template:ABSTRACT PUBMED 18156340

About this Structure

2QXZ is a Single protein structure of sequence from Xanthomonas campestris pv. campestris. Full crystallographic information is available from OCA.

Reference

Improvement of the thermostability and activity of a pectate lyase by single amino acid substitutions, using a strategy based on melting-temperature-guided sequence alignment., Xiao Z, Bergeron H, Grosse S, Beauchemin M, Garron ML, Shaya D, Sulea T, Cygler M, Lau PC, Appl Environ Microbiol. 2008 Feb;74(4):1183-9. Epub 2007 Dec 21. PMID:18156340

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