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J Biol Chem, Vol. 274, Issue 19, 13569-13576, May 7, 1999

Bacillus subtilis Histone-like Protein, HBsu, Is an Integral Component of a SRP-like Particle That Can Bind the Alu Domain of Small Cytoplasmic RNA

Kouji Nakamura, Shou-ichi Yahagi, Takao Yamazaki, and Kunio Yamane

From the Institute of Biological Sciences, University of Tsukuba, Tsukuba-shi, Ibaraki 305, Japan

Small cytoplasmic RNA (scRNA) is metabolically stable and abundant in Bacillus subtilis cells. Consisting of 271 nucleotides, it is structurally homologous to mammalian signal recognition particle RNA. In contrast to 4.5 S RNA of Escherichia coli, B. subtilis scRNA contains an Alu domain in addition to the evolutionarily conserved S domain. In this study, we show that a 10-kDa protein in B. subtilis cell extracts has scRNA binding activity at the Alu domain. The in vitro binding selectivity of the 10-kDa protein shows that it recognizes the higher structure of the Alu domain of scRNA caused by five consecutive complementary sequences in the two loops. Purification and subsequent analyses demonstrated that the 10-kDa protein is HBsu, which was originally identified as a member of the histone-like protein family. By constructing a HBsu-deficient B. subtilis mutant, we showed that HBsu is essential for normal growth. Immunoprecipitating cell lysates using anti-HBsu antibody yielded scRNA. Moreover, the co-precipitation of HBsu with (His)6-tagged Ffh depended on the presence of scRNA, suggesting that HBsu, Ffh, and scRNA make a ternary complex and that scRNA serves as a functional unit for binding. These results demonstrated that HBsu is the third component of a signal recognition particle-like particle in B. subtilis that can bind the Alu domain of scRNA.

Copyright © 1999 by The American Society for Biochemistry and Molecular Biology, Inc.
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