Hello, could it be an acetyl group, as in the attached figure? I am no expert 
on carbohydrates, though.

Best wishes, Jon Cooper.
jon.b.coo...@protonmail.com

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-------- Original Message --------
On 29/03/2025 09:54, mdimarog <mdima...@upatras.gr> wrote:

>  Dear all,
>  
>  We have a question regarding electron density observed next to a
>  pentose. It is in the active site of a xylanase, it is the product of
>  hydrolytic reaction, and instead of an entire sugar we observe the
>  density shown in the attached figure (at subsite -1). Next to it is the
>  pentose at subsite -2, well resolved, since the reaction product is an
>  oligosaccharide. Has anybody ever observed such a case in carbohydrate
>  active enzymes?
>  
>  Many thanks in advance for your answer.
>  
>  Have a nice weekend.
>  
>  Best regards,
>  
>  Maria Dimarogona
>  
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