title: Binding of S-layer homology modules from Clostridium thermocellum SdbA to peptidoglycans.
abstract: S-layer homology (SLH) module polypeptides were derived from Clostridium josui xylanase Xyn10A, Clostridium stercorarium xylanase Xyn10B, and Clostridium thermocellum scafoldin dockerin binding protein SdbA as rXyn10A-SLH, rXyn10B-SLH, and rSdbA-SLH, respectively. Their binding specificities were investigated using various cell wall preparations. rXyn10A-SLH and rXyn10B-SLH bound to native peptidoglycan-containing sacculi consisting of peptidoglycan and secondary cell wall polymers (SCWP) prepared from these bacteria but not to hydrofluoric acid-extracted peptidoglycan-containing sacculi (HF-EPCS) lacking SCWP, suggesting that SCWP are responsible for binding with SLH modules. In contrast, rSdbA-SLH interacted with HF-EPCS, suggesting that this polypeptide had an affinity for peptidoglycans but not for SCWP. The affinity of rSdbA-SLH for peptidoglycans was confirmed by a binding assay using a peptidoglycan fraction prepared from Escherichia coli cells. The SLH modules of SdbA must be useful for cell surface engineering in bacteria that do not contain SCWP.
authors.affiliation: Faculty of Bioresources, Mie University, Tsu, Japan.
authors.forename: Guangshan
authors.initials: G
authors.lastname: Zhao
authors.forename: Ehsan
authors.initials: E
authors.lastname: Ali
authors.forename: Makiko
authors.initials: M
authors.lastname: Sakka
authors.forename: Tetsuya
authors.initials: T
authors.lastname: Kimura
authors.forename: Kazuo
authors.initials: K
authors.lastname: Sakka
mesh_terms: D000595:Amino Acid Sequence; D001426:Bacterial Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D001665:Binding Sites; D002473:Cell Wall / Q000737:chemistry; D048013:Acetivibrio thermocellus / Q000737:chemistry*; D004926:Escherichia coli / Q000737:chemistry; D008562:Membrane Glycoproteins / Q000235:genetics / Q000378:metabolism*; D008565:Membrane Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D008969:Molecular Sequence Data; D010457:Peptidoglycan / Q000378:metabolism*; D010957:Plasmids; D011993:Recombinant Fusion Proteins / Q000378:metabolism
chemical_list: D001426:Bacterial Proteins; D008562:Membrane Glycoproteins; D008565:Membrane Proteins; D010457:Peptidoglycan; D011993:Recombinant Fusion Proteins; C055764:S-layer proteins; C105449:SdbA protein, bacteria