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Probing protease sensitivity of recombinant human erythropoietin reveals α3-α4 inter-helical loop as a stability determinant.

IR@IMTECH: CSIR-Institute of Microbial Technology, Chandigarh


Field	Value

Title	Probing protease sensitivity of recombinant human erythropoietin reveals α3-α4 inter-helical loop as a stability determinant.

Creator	Sebastian Samuel, Jesse Kumar, Deepak Babu Chodisetti, Sathi Agrewala, Javed N Singh, Balvinder Guptasarma, Purnananda Sarkar, Dibyendu

Subject	QR Microbiology

Description	Although unglycosylated HuEpo is fully functional, it has very short serum half-life. However, the mechanism of in vivo clearance of human Epo (HuEpo) remains largely unknown. In this study, the relative importance of protease-sensitive sites of recombinant HuEpo (rHuEpo) has been investigated by analysis of structural data coupled with in vivo half-life measurements. Our results identify α3-α4 inter-helical loop region as a target site of lysosomal protease Cathepsin L. Consistent with previously-reported lysosomal degradation of HuEpo, these results for the first time identify cleavage sites of rHuEpo by specific lysosomal proteases. Furthermore, in agreement with the lowered exposure of the peptide backbone around the cleavage site, remarkably substitutions of residues with bulkier amino acids result in significantly improved in vivo stability. Together, these results have implications for the mechanism of in vivo clearance of the protein in humans.

Publisher	Wiley Online

Date	2015-10

Type	Article PeerReviewed

Relation	http://dx.doi.org/10.1002/prot.24865 http://crdd.osdd.net/open/1758/

Identifier	Sebastian Samuel, Jesse and Kumar, Deepak and Babu Chodisetti, Sathi and Agrewala, Javed N and Singh, Balvinder and Guptasarma, Purnananda and Sarkar, Dibyendu (2015) Probing protease sensitivity of recombinant human erythropoietin reveals α3-α4 inter-helical loop as a stability determinant. Proteins, 83 (10). pp. 1813-22. ISSN 1097-0134