Proteomic approach and expression analysis revealed the differential expression of predicted leptospiral proteases capable of ECM degradation

Publication date: Available online 12 April 2018 Source:Biochimica et Biophysica Acta (BBA) - Proteins and Proteomics Author(s): Dhandapani Gunasekaran, Thoduvayil Sikha, Sneha M. Pinto, M. Kiran Kumar, Krishna Patel, Manish Kumar, Vikram Kumar, Jebasingh Tennyson, P.K. Satheeshkumar, Harsha Gowda, T.S. Keshava Prasad, M.G. Madanan Leptospira, the causative agent of leptospirosis is known to have many proteases with potential to degrade extracellular matrix. However, a multipronged approach to identify, classify, characterize and elucidate their role has not been attempted. Our proteomic approach using high-resolution LC-MS/MS analysis of Triton X-114 fractions of Leptospira interrogans resulted in the identification of 104 proteases out of 130 proteases predicted by MEROPS. In Leptospira approximately 3.5% of the genome complements for proteases, which include catalytic types of metallo-, serine-, cysteine-, aspartic-, threonine- and asparagine- peptidases. Comparison of proteases from different serovars revealed that M04, M09B, M14A, M75, M28A, A01 and U73 protease families are exclusively present in pathogenic form. The M23 and S33 protease families are represented with >14 members in Leptospira. The differential expression under physiological temperature (37 °C) and osmolarity (300 mOsM) showed that proteases belonging to the catalytic type of Metallo-peptidases are upregulated significantly in pathogenic conditions. In silico prediction and char...

Source: Biochimica et Biophysica Acta (BBA) Proteins and Proteomics - April 12, 2018 Category: Biochemistry Source Type: research