title: Influence of transposition and insertion of additional binding domain on expression and characteristics of xylanase C of Clostridium thermocellum.
abstract: Clostridium thermocellum encodes a xylanase gene (xynC) which is the major component of its cellulosome. XynC is a multidomain enzyme comprising of a substrate binding domain at the N-terminal followed by the catalytic domain and a dockerin domain. To study the influence of binding domain on activity, stability and expression of the enzyme the protein with the binding domain at C-terminal (XynC-CB), and the one with the binding domain at both N- and C-terminal (XynC-BCB) were expressed in E. coli. Recombinant plasmids, pXynC-CB and pXynC-BCB were constructed by inserting the corresponding gene in pET22b(+). XynC-CB and XynC-BCB were expressed at levels around 30% and 33% of the total E. coli cell proteins, respectively, while losing 40% and 20% of their activities at 70°C for 120 min, respectively. The specific activities of XynC-CB, XynC-BCB were 76 and 98 U mg(-1), while the activities on equimolar basis were 4410 and 7450 U μM(-1) against birchwood xylan, respectively. Their overall activities produced in the culture were 3660 and 5430 U L(-1) OD(600)(-1). Substrate binding studies showed that in case of XynC-C 51% of the activity remained unbound to birchwood xylan, whereas in the cases of XynC-BC, XynC-CB and XynC-BCB the activities left unbound were 33%, 32% and 12%, respectively, under the assay conditions used. Similar binding values were obtained in the case of oat spelt xylan. K(m) values for XynC-CB and XynC-BCB against birchwood xylan were found to be 3.1 and 1.47 mg ml(-1), respectively. Thus addition of a second carbohydrate binding domain at the C-terminal of the catalytic domain enhances activity, substrate affinity as well as thermostability.
authors.affiliation: School of Biological Sciences, University of the Punjab, Quaid-e-Azam Campus, Lahore 54590, Pakistan.
authors.forename: M Imran Mahmood
authors.initials: MI
authors.lastname: Khan
authors.forename: Muhammad
authors.initials: M
authors.lastname: Sajjad
authors.forename: Imran
authors.initials: I
authors.lastname: Ali
authors.forename: Sajjad
authors.initials: S
authors.lastname: Ahmad
authors.forename: M Waheed
authors.initials: MW
authors.lastname: Akhtar
mesh_terms: D001665:Binding Sites; D003001:Cloning, Molecular; D048013:Acetivibrio thermocellus / Q000201:enzymology* / Q000235:genetics; D043364:Endo-1,4-beta Xylanases / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism; D004795:Enzyme Stability; D004926:Escherichia coli / Q000235:genetics; D007700:Kinetics; D016133:Polymerase Chain Reaction; D011485:Protein Binding; D015202:Protein Engineering; D017434:Protein Structure, Tertiary; D011994:Recombinant Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D013329:Structure-Activity Relationship
chemical_list: D011994:Recombinant Proteins; D043364:Endo-1,4-beta Xylanases