Abstract
The effect of the iron-chelating compounds EDDA and BPD on polypeptide regulation in the putative oral pathogen Treponema denticola was studied. SDS-PAGE analysis of the T. denticola strains grown in the presence of EDDA or BPD, i.e. iron-limiting environmental conditions, revealed the expression of 44 and 43 kDa polypeptides in the outer sheath, a 73 kDa polypeptide in the cell membrane, and a 16 kDa polypeptide in the soluble cell fraction. The hemin-binding activity of purified outer sheaths from T. denticola TD-4 grown in the presence of 6.4 mM EDDA was significantly greater than that observed in control (absence of EDDA) outer sheaths. Both activities were inhibited by proteinase K. SDS-PAGE, LDS-PAGE and TMBZ staining revealed the 44 and 43 kDa outer-sheath polypeptides to be expressed by T. denticola strains GM-1. MS-25, ATCC 33520 and ATCC 33404 (TD-4), strains which possessed strong hemin-binding activity. The 44 kDa hemin-binding polypeptide was purified by 1% CHAPS solubilization, HPLC, and SDS-preparative electrophoresis. N'-terminal sequence analysis indicated the purified 44 kDa polypeptide to belong to a new, undescribed group of polypeptides possessing hemin-binding activity.
Publication types
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Research Support, U.S. Gov't, P.H.S.
MeSH terms
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2,2'-Dipyridyl / pharmacology
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Amino Acid Sequence
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Animals
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Antibodies / immunology
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Bacterial Outer Membrane Proteins / genetics
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Bacterial Outer Membrane Proteins / immunology
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Bacterial Outer Membrane Proteins / isolation & purification
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Bacterial Outer Membrane Proteins / metabolism*
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Carrier Proteins / genetics
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Carrier Proteins / immunology
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Carrier Proteins / isolation & purification
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Carrier Proteins / metabolism*
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Chelating Agents / pharmacology*
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Culture Media / pharmacology
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Edetic Acid / analogs & derivatives*
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Edetic Acid / pharmacology
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Gene Expression Regulation, Bacterial / drug effects*
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Heme-Binding Proteins
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Hemeproteins / genetics
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Hemeproteins / immunology
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Hemeproteins / isolation & purification
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Hemeproteins / metabolism*
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Hemin / metabolism*
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Iron / pharmacology*
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Iron-Binding Proteins
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Molecular Sequence Data
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Protein Binding / drug effects
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Rabbits
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Sequence Homology, Amino Acid
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Transferrin-Binding Proteins
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Treponema / drug effects*
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Treponema / genetics
Substances
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Antibodies
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Bacterial Outer Membrane Proteins
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Carrier Proteins
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Chelating Agents
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Culture Media
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Heme-Binding Proteins
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Hemeproteins
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Iron-Binding Proteins
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Transferrin-Binding Proteins
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2,2'-Dipyridyl
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EDDA
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Hemin
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Edetic Acid
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Iron