TY - JOUR
T1 - Cloning, Expression, and Homology Modeling of GroEL Protein from Leptospira interrogans Serovar Autumnalis Strain N2
AU - Natarajaseenivasan, Kalimuthusamy
AU - Shanmughapriya, Santhanam
AU - Velineni, Sridhar
AU - Artiushin, Sergey C.
AU - Timoney, John F.
N1 - Funding Information:
KN is thankful to the Department of Biotechnology (DBT), New Delhi, India for funding and providing DBT Overseas Associateship Training in Niche areas of Biotechnology. The authors are also thankful to the Vice-Chancellor, Bharathidasan University and the President, University of Kentucky for the research facilities provided to carry out this work.
PY - 2011/10
Y1 - 2011/10
N2 - Leptospirosis is an infectious bacterial disease caused by Leptospira species. In this study, we cloned and sequenced the gene encoding the immunodominant protein GroEL from L. interrogans serovar Autumnalis strain N2, which was isolated from the urine of a patient during an outbreak of leptospirosis in Chennai, India. This groEL gene encodes a protein of 60 kDa with a high degree of homology (99% similarity) to those of other leptospiral serovars. Recombinant GroEL was overexpressed in Escherichia coli. Immunoblot analysis indicated that the sera from confirmed leptospirosis patients showed strong reactivity with the recombinant GroEL while no reactivity was observed with the sera from seronegative control patient. In addition, the 3D structure of GroEL was constructed using chaperonin complex cpn60 from Thermus thermophilus as template and validated. The results indicated a Z-score of -8.35, which is in good agreement with the expected value for a protein. The superposition of the Ca traces of cpn60 structure and predicted structure of leptospiral GroEL indicates good agreement of secondary structure elements with an RMSD value of 1.5 å. Further study is necessary to evaluate GroEL for serological diagnosis of leptospirosis and for its potential as a vaccine component.
AB - Leptospirosis is an infectious bacterial disease caused by Leptospira species. In this study, we cloned and sequenced the gene encoding the immunodominant protein GroEL from L. interrogans serovar Autumnalis strain N2, which was isolated from the urine of a patient during an outbreak of leptospirosis in Chennai, India. This groEL gene encodes a protein of 60 kDa with a high degree of homology (99% similarity) to those of other leptospiral serovars. Recombinant GroEL was overexpressed in Escherichia coli. Immunoblot analysis indicated that the sera from confirmed leptospirosis patients showed strong reactivity with the recombinant GroEL while no reactivity was observed with the sera from seronegative control patient. In addition, the 3D structure of GroEL was constructed using chaperonin complex cpn60 from Thermus thermophilus as template and validated. The results indicated a Z-score of -8.35, which is in good agreement with the expected value for a protein. The superposition of the Ca traces of cpn60 structure and predicted structure of leptospiral GroEL indicates good agreement of secondary structure elements with an RMSD value of 1.5 å. Further study is necessary to evaluate GroEL for serological diagnosis of leptospirosis and for its potential as a vaccine component.
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U2 - 10.1016/S1672-0229(11)60018-1
DO - 10.1016/S1672-0229(11)60018-1
M3 - Article
C2 - 22196358
AN - SCOPUS:84255200432
SN - 1672-0229
VL - 9
SP - 151
EP - 157
JO - Genomics, Proteomics and Bioinformatics
JF - Genomics, Proteomics and Bioinformatics
IS - 4-5
ER -