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Journal of Dental Research
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Studies on the Subcellular Localization of Protease and Arylaminopeptidase Activities in Streptococcus sanguis ATCC 10556

R.A. Cowman

Dental Research Unit, Department of Veterans Affairs Medical Center, Miami, Florida 33125, Department of Medicine, University of Miami, School of Medicine, Miami, Florida

S.S. Baron

Dental Research Unit, Department of Veterans Affairs Medical Center, Miami, Florida 33125

Intact cells of Streptococcus sanguis ATCC 10556 possessed arylaminopeptidases exhibiting activity toward the nitroanilide (NA) derivatives of leucine, alanine, methionine, arginine, or lysine. Weak hydrolytic activity was observed in assays with the NA derivatives of valine, proline, glycine, or glutamic acid. Subcellular localization studies revealed that arylaminopeptidase activities were located in both the cell membrane and cytoplasm. Arylaminopeptidases exhibiting activity toward the leucine, alanine, or methionine NA substrates appeared to be more predominantly associated with the membrane, whereas enzymes exhibiting activity toward arginyl-NA or lysyl-NA were more prevalently located in the cytoplasm. Several results from this study suggest that the membrane-associated arginyl and lysyl arylaminopeptidases were located in such a way that their expression was restricted in the intact cell. The addition of 0.5 mol/L NaCl to protoplast preparations derived from mutanolysin-treated cells resulted in an almost complete solubilization of membrane-associated arylaminopeptidase activities. These observations support the conclusion that the association of arylaminopeptidases with the cell membrane may involve hydrophobic or electrostatic interactions, or both. S. sanguis ATCC 10556 also possessed at least one caseinolytic endopeptidase activity. This activity is most likely located near the membrane surface, as no association with the cell wall was evident. The location of membrane-associated endopeptidase and arylaminopeptidase activities, together with intracellular peptidases, is suggested to provide an efficient mechanism for the hydrolysis and subsequent utilization of polypeptide and oligopeptide substrates as sources of amino acids for growth by this microorganism.

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Journal of Dental Research, Vol. 70, No. 12, 1508-1515 (1991)
DOI: 10.1177/00220345910700120701
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R.A. Cowman and S.S. Baron
Pathway for Uptake and Degradation of X-Prolyl Tripeptides in Streptococcus mutans VA-29R and Streptococcus sanguis ATCC 10556
Journal of Dental Research, August 1, 1997; 76(8): 1477 - 1484.
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