Linked Life Data

12573246

Source:http://linkedlifedata.com/resource/pubmed/id/12573246

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
2
pubmed:dateCreated
2003-2-7
pubmed:abstractText
Low concentrations of urea (1.2 M) stimulated the activity of endo-xylanase from Chainia by 30%. Subtle structural changes in the monomeric protein were reflected in the secondary and tertiary structure of the enzyme as monitored by fluorescence and circular dichroism. Changes in lambda(max) of emission, the fluorescence intensity and the Stern-Volmer quenching constants for acrylamide, measured in the presence of urea, indicated changes in the microenvironment of the Trp residues, suggesting alterations in tertiary structure. The ellipticity changes at 220 nm and Selcon analysis reflected changes in the content of beta-sheet while both the near- and far-UV CD spectra indicated alterations in the secondary and tertiary structure of the protein in presence of urea. The dissociation constant values (K(d)) show very little change in the affinity of the enzyme for the substrate while the k(cat) values suggest enhanced turnover of the substrate in presence of urea. We suggest that low urea concentrations perturb the conformational state of xylanase leading to an open and a more flexible structure, resulting in enhanced catalytic rates.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Feb
pubmed:issn
0006-3002
pubmed:author
pubmed:issnType
Print
pubmed:day
21
pubmed:volume
1645
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
164-71
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
2003
pubmed:articleTitle
Structural changes enhance the activity of Chainia xylanase in low urea concentrations.
pubmed:affiliation
Division of Organic Chemistry, National Chemical Laboratory, 411 007, Pune, India.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't