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Title 

The influence of HtrA expression on the growth of streptococcus mutans during acid stress

Authors 

K H KangJung-Sook LeeM YooI Jin

Publisher 

Springer Verlag (Germany)

Issue Date 

2010

Citation 

Molecules and Cells, vol. 29, no. 3, pp. 297-304

Keywords 

AcidHtrAKoreanStreptococcus mutansStress

Abstract 

When proteins are damaged under stresses conditions, these proteins are either refolded or degraded by a quality control system of molecular chaperones and protease. High-temperature requirement A (htrA) is of particular interest because it can perform the roles of both a protease and a chaperone. HtrA plays an important role in maintaining the physiological homeostasis of bacteria against environmental stress such as elevated temperature, oxidative and osmotic stress. Inactivation of htrA genes can thus restrict the survival ability of bacteria. These observations suggested that htrA might be responsible for acid tolerance of Streptococcus mutans. In this study, we have generated an htrA mutant and an htrA-complemented strain of S. mutans K7 isolated from a Korean in order to investigate the role of htrA in growth under acidic conditions. In terms of growth under acidic conditions, the htrA mutant exhibited 20% to 23% lower growth than the control group. In addition, glucosyltransferaseB and glucosyltransferaseC expression levels significantly decreased. When the htrA ex pression level was restored by adding the htrA gene to the htrA mutant strain, the normal growth phenotype was restored under acid stress. Further, similar results were obtained for S. mutans UA159. Thus, htrA in S. mutans K7, as well as S. mutans UA159, can be concluded to play an important role during acid stress.

ISSN 

1016-8478

Link 

http://dx.doi.org/10.1007/s10059-010-0036-9

Appears in Collections

1. Journal Articles > Journal Articles

Registered Date

2019-05-02


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