Assoc. prof. @LUMC_Leiden/CMAT. Cdiff, DNA replication, AMR, microbiome, anaerobes. Clostpath SC. Education officer ESGCD. Also: @smitslab.bsky.social

Leiden, Nederland
Joined August 2015
Wiep Klaas Smits@SmitsLabSep 11
It's a wrap! #ICDS2026 has come to an end. As usual, flawless execution, great crowd. There will be another ICDS in two years - but not organised by Maja Rupnik anymore. Lots of respect and appreciation for what she has done over the past decades for the #cdiff community.
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Wiep Klaas Smits@SmitsLabJul 16
Look what arrived in the mail! @SpringerNature @AuchtungJ โ€“ at Leyden, The Netherlands
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Wiep Klaas Smits@SmitsLabJan 20
Awesome #aurora from our home balcony. Brightest I have seen in The Netherlands to date! (only one picture, straight from camera, no edits)
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Wiep Klaas Smits@SmitsLab24 Nov 2025
November is #CdiffAwarenessMonth. Amazing work by Lizah vd Aart turned my idea into a cartoon to help explain why antibiotics are a risk factor for #CDI. More to come! The English version is supported by the #ESGCD (@ESCMID). Let me know if you think these cartoons are useful!
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Wiep Klaas Smits@SmitsLab6 Nov 2025
PolC inhibitors are new-to-nature; we saw no pre-existing resistance, and PolC inhibitors are active against drug resistant bacteria like VRE and MRSA. 7/9
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Wiep Klaas Smits@SmitsLab6 Nov 2025
We identify a key residue for susceptibility: a Phe that is part of the induced binding pocket. An equivalent mutation in #Cdiff also increases the MIC. Not all identified mutations have the same effects, suggesting that this is a feature that can be engineered. 6/9
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Wiep Klaas Smits@SmitsLab6 Nov 2025
We generated structures of E. faecium PolC in the presence of DNA, with or without IBZ or ACX-801. The compounds sit where you would expect dGTP to be. Key finding: the inhibitors adopt a "hook" shape that slots into an induced pocket. 5/9
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Wiep Klaas Smits@SmitsLab6 Nov 2025
Our work focuses on ibezapolstat (for treatment of #Cdifficile infections #CDI) and a novel compound from a series that is intended to target other pathogens, like #VRE and #MRSA. ACX-801 was selected on the basis of excellent inhibition of PolC in vitro. 4/9
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Wiep Klaas Smits@SmitsLab5 Sep 2025
Looking back at a great #clostpath2025 (Paris), and ahead to #icds2026 (Bled) and #clostpath2027 (Rio de Janeiro).
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Wiep Klaas Smits@SmitsLab12 May 2025
Midnight microbiology #noctiluca #katwijk #magic #northsea
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