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. 1991 Nov;173(22):7374–7381. doi: 10.1128/jb.173.22.7374-7381.1991

A survey of the heat shock response in four Streptomyces species reveals two groEL-like genes and three groEL-like proteins in Streptomyces albus.

G Guglielmi 1, P Mazodier 1, C J Thompson 1, J Davies 1
PMCID: PMC209247  PMID: 1682303

Abstract

A survey of the heat shock response was carried out in a series of streptomycetes. Four major heat shock proteins (HSPs) were observed in each of four species (Streptomyces albus, S. lividans, S. parvulus, S. viridochromogenes) after pulse labeling with [35S]methionine and analysis by sodium dodecyl sulfate-polyacrylamide gel electrophoresis. Three corresponded to the major procaryotic HSPs Lon, DnaK, and GroEL on the basis of their apparent molecular masses (94 to 100, 70, and 56 to 58 kDa, respectively). In addition, a smaller protein (16 to 18 kDa) was detected in all species but was most dramatically induced in S. albus. Consequently, studies focused on this species. As in other procaryotic systems, thermal induction (elicited by a shift from 30 degrees C to 41 degrees C) of the 70- and 94-kDa proteins was transient and expression returned to uninduced levels after 60 min. In contrast, the 56- to 58-kDa (GroEL) and 18-kDa proteins (HSP18) remained induced for more than 2 h. Two-dimensional gel electrophoresis allowed resolution of at least eight S. albus HSPs. HSP56-58 was composed of multiple acidic protein species, whereas HSP18 appeared to be basic. In spite of these differences in their physical characteristics, the N-terminal peptide sequence of HSP18 was similar to those of GroEL-like proteins found in other organisms and identical to one of the HSP56-58 species. In fact, N-terminal amino acid analysis of the S. albus 56- to 58-kDa species showed that it was composed of two proteins that differed in 3 of 10 positions, an observation that was supported by the detection of two groEL-like genes by Southern hybridization. The amino acid sequence of one of these proteins was identical to that of HSP18. Pulse-chase experiments did not reveal evidence of posttranslational processing of either HSP56-58 or HSP18.

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