NDLI: Characterization and Implications of the Cell Surface Reactivity of Calothrix sp. Strain KC97

Content Provider	PubMed Central
Author	Phoenix, V. R. Martinez, R. E. Konhauser, K. O. Ferris, F. G.
Copyright Year	2002
Abstract	The cell surface reactivity of the cyanobacterium Calothrix sp. strain KC97, an isolate from the Krisuvik hot spring, Iceland, was investigated in terms of its proton binding behavior and charge characteristics by using acid-base titrations, electrophoretic mobility analysis, and transmission electron microscopy. Analysis of titration data with the linear programming optimization method showed that intact filaments were dominated by surface proton binding sites inferred to be carboxyl groups (acid dissociation constants [pKa] between 5.0 and 6.2) and amine groups (mean pKa of 8.9). Sheath material isolated by using lysozyme and sodium dodecyl sulfate generated pKa spectra similarly dominated by carboxyls (pKa of 4.6 to 6.1) and amines (pKa of 8.1 to 9.2). In both intact filaments and isolated sheath material, the lower ligand concentrations at mid-pKa values were ascribed to phosphoryl groups. Whole filaments and isolated sheath material displayed total reactive-site densities of 80.3 × 10−5 and 12.3 × 10−5 mol/g (dry mass) of cyanobacteria, respectively, implying that much of the surface reactivity of this microorganism is located on the cell wall and not the sheath. This is corroborated by electrophoretic mobility measurements that showed that the sheath has a net neutral charge at mid-pHs. In contrast, unsheathed cells exhibited a stronger negative-charge characteristic. Additionally, transmission electron microscopy analysis of ultrathin sections stained with heavy metals further demonstrated that most of the reactive binding sites are located upon the cell wall. Thus, the cell surface reactivity of Calothrix sp. strain KC97 can be described as a dual layer composed of a highly reactive cell wall enclosed within a poorly reactive sheath.
Related Links	http://dx.doi.org/10.1128/aem.68.10.4827-4834.2002
Ending Page	4834
Page Count	8
Starting Page	4827
File Format	PDF
ISSN	00992240
e-ISSN	10985336
Journal	Applied and Environmental Microbiology
Issue Number	10
Volume Number	68
Language	English
Publisher	American Society for Microbiology
Publisher Date	2002-10-01
Access Restriction	Open
Rights Holder	American Society for Microbiology
Subject Keyword	Biotechnology Food Science Ecology Applied Microbiology and Biotechnology Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Ecology Food Science Applied Microbiology and Biotechnology Biotechnology

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