5bxs
From Proteopedia
LNBase in complex with LNB-NHAcCAS
Structural highlights
FunctionLNBB_BIFB1 Present in the infant gut, this enzyme is involved in the assimilation of type-1 human milk oligosaccharides (HMOs). It hydrolyzes via a retaining mechanism the beta-D-GlcNAc-(1->3)-beta-D-Gal linkage in lacto-N-tetraose (LNT or beta-D-Gal-(1->3)-beta-D-GlcNAc-(1->3)-beta-D-Gal-(1->4)-D-Glc), an abundant HMO unique to human breast milk, releasing lacto-N-biose (LNB or beta-D-Gal-(1->3)-D-GlcNAc) and lactose (PubMed:18469123, PubMed:23479733). Is a key enzymatic factor for growth and proliferation of B.bifidum in the gut ecosystem of breast-fed infants (Probable). Has substrate preference for unmodified beta-linked LNB since it does not hydrolyze the fucosylated forms of lacto-N-tetraose (lacto-N-fucopentaose I and II) or lacto-N-neotetraose. Is also able to display transglycosylation activity in vitro (PubMed:18469123).[1] [2] [3] Publication Abstract from PubMedThe synthesis of potent inhibitors for lacto-N-biosidases and X-ray structural characterization of these compounds in complex with BbLNBase is described. Gaining insight into the catalysis by GH20 lacto-N-biosidase using small molecule inhibitors and structural analysis.,Hattie M, Ito T, Debowski AW, Arakawa T, Katayama T, Yamamoto K, Fushinobu S, Stubbs KA Chem Commun (Camb). 2015 Aug 27. PMID:26312778[4] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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