Engineering and Characterization of an Enzyme Replacement Therapy for Classical Homocystinuria.

Abstract:

:Homocystinuria due to loss of cystathionine beta-synthase (CBS) causes accumulation of homocysteine and depletion of cysteine. Current treatments are suboptimal, and thus the development of an enzyme replacement therapy based on PEGylated human truncated CBS (PEG-CBS) has been initiated. Attenuation of potency was observed, which necessitated a screen of several PEG-CBS conjugates for their efficacy to correct and maintain the plasma metabolite profile of murine homocystinuria after repeated administrations interrupted with washouts. We found that CBS coupling with maleimide PEG inconsistently modified the enzyme. In contrast, the PEG-CBS conjugate with 20 kDa N-hydroxysuccinimide-PEG showed very little loss of potency likely due to a reproducible PEGylation resulting in species modified with five PEGs per subunit on average. We developed assays suitable for monitoring the extent of CBS PEGylation and demonstrated a sustainable partial normalization of homocystinuria upon continuous PEG-CBS administration via osmotic pumps. Taken together, we identified the PEG-CBS conjugate suitable for manufacturing and clinical development.

journal_name

Biomacromolecules

journal_title

Biomacromolecules

authors

Majtan T,Park I,Carrillo RS,Bublil EM,Kraus JP

doi

10.1021/acs.biomac.7b00154

subject

Has Abstract

pub_date

2017-06-12 00:00:00

pages

1747-1761

issue

6

eissn

1525-7797

issn

1526-4602

journal_volume

18

pub_type

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