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Aspartylglucosaminuria (AGU) is a lysosomal storage disease caused by a metabolic disorder of lysosomes to digest Asn-linked glycoproteins. The specific enzyme linked to AGU is a lysosomal hydrolase called glycosylasparaginase. Crystallographic studies revealed that a surface loop blocks the catalytic center of the mature hydrolase. Autoproteolysis is therefore required to remove this P loop and open...
Most well-known restriction endonucleases recognize palindromic DNA sequences and are classified as Type IIP. Due to the recognition and cleavage symmetry, Type IIP enzymes are usually found to act as homodimers in forming 2-fold symmetric enzyme-DNA complexes. Here we report an asymmetric complex of the Type IIP restriction enzyme MspI in complex with its cognate recognition sequence. Unlike any...
Glycosylasparaginase uses an autoproteolytic processing mechanism, through an N-O acyl shift, to generate a mature/active enzyme from a single-chain precursor. Structures of glycosylasparaginase precursors in complex with a glycine inhibitor have revealed the backbone in the immediate vicinity of the scissile peptide bond to be in a distorted trans conformation, which is believed to be the driving...
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