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Titia Sixma

@titiasixma

Structural biologist and biochemist, interested in ubiquitin enzymes and DNA repair & regulation

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13.11.2024
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Latest posts by Titia Sixma @titiasixma

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We;re hiring Junior Group Leaders! πŸ”¬βœ¨
We’re looking for researchers in immunology, chemical biology, AI in biology, or protein design to launch their own independent groups in our collaborative, international environment.

www.nki.nl/news-events/...

20.02.2026 13:32 πŸ‘ 14 πŸ” 20 πŸ’¬ 0 πŸ“Œ 1

This meeting comes highly recommended! Register soon!

17.01.2026 17:34 πŸ‘ 5 πŸ” 3 πŸ’¬ 0 πŸ“Œ 0

This is wonderful!!
Many many thanks to Friedrich and everyone else for the enormous amount of work you have done to ensure the future of cryo-EM research in the Netherlands!

04.11.2025 07:25 πŸ‘ 11 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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β€œIt’s amazing to be the very first person to understand something at such a miniscule scale”.

From October 1st, junior group leader Wout Oosterheert will give a boost to fundamental cancer research at the Netherlands Cancer Institute ➑️ www.nki.nl/news-events/...

30.09.2025 11:51 πŸ‘ 15 πŸ” 1 πŸ’¬ 0 πŸ“Œ 0

The latest work from ours and @vram142.bsky.social lab is out! True teamwork to visualize nascent chromatin with strand resolution, using a fully reconstituted system. Very proud of superstar-PhD student Bruna, and @palindromephd.bsky.social. Learning so much from Vijay’s amazing technologies! RT

21.09.2025 07:12 πŸ‘ 36 πŸ” 12 πŸ’¬ 2 πŸ“Œ 0

Congratulations to everyone but especially Venda & Sylvie for this nice work and thanks to Andrea Murachelli in my lab for his analyses

18.09.2025 09:27 πŸ‘ 4 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

Happy to see this out, great work from Niels, combining kinetic analysis, cryoEM and an unexpected gain-of-function mutant, nice work from master students Jan and Nina, from Kaustav and from Alex for the kinetics
β€ͺ@oncodeinstitute.bsky.social‬,
β€ͺ@nkinl.bsky.social‬

31.07.2025 12:38 πŸ‘ 28 πŸ” 5 πŸ’¬ 2 πŸ“Œ 0
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Proud! πŸ’™ Our scientific director Thijn Brummelkamp receives the Spinoza Prize, a prize for scientists who belong to the best researchers worldwide. A wonderful recognition for his groundbreaking research.

Congrats Thijn! πŸŽ‰ @thijnbrummel.bsky.social

Full article ➑️ bit.ly/40p4KnK

27.06.2025 05:51 πŸ‘ 38 πŸ” 5 πŸ’¬ 0 πŸ“Œ 1
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In the context of our @reviewcommons.org revision process, I'm happy to announce Microscopy Nodes v2.2.0!
This packs lots of new fun features, including new color management 🌈, clearer transparency handling πŸ«₯, custom default settings πŸ”§ and more!
Preprint at doi.org/10.1101/2025...

23.05.2025 13:13 πŸ‘ 93 πŸ” 32 πŸ’¬ 2 πŸ“Œ 2
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This is accompanied by a new set of tutorials showing exactly how you can start making beautiful microscopy visualizations in @blender.org!
Following along is also easy with the example OME-Zarr @openmicroscopy.org datasets πŸ˜„
Find the tutorials here: www.youtube.com/playlist?lis...

23.05.2025 13:13 πŸ‘ 30 πŸ” 7 πŸ’¬ 0 πŸ“Œ 1

LocScale-SURFER is now also available for quick install via the ChimeraX toolshed:

cxtoolshed.rbvi.ucsf.edu

26.05.2025 11:10 πŸ‘ 17 πŸ” 9 πŸ’¬ 0 πŸ“Œ 0

Harvard has set an example for other higher-ed institutions - rejecting an unlawful and ham-handed attempt to stifle academic freedom, while taking steps to make sure students can benefit from an environment of intellectual inquiry, rigorous debate and mutual respect. Let’s hope others follow suit.

15.04.2025 03:52 πŸ‘ 89668 πŸ” 18252 πŸ’¬ 1596 πŸ“Œ 747
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A must for all DNA repair aficionados!

Egmond DNA Repair Meeting β†’ April 19–24, 2026 πŸ‡³πŸ‡±
βœ”οΈ Confirmed top speakers
βœ”οΈ Ample opportunities for talks & posters

Don’t miss it: dnarepairmeeting-egmond2026.com

09.04.2025 08:04 πŸ‘ 37 πŸ” 19 πŸ’¬ 4 πŸ“Œ 1
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Doctor Behind Award-Winning Parkinson’s Research Among Scientists Purged From NIH Leading scientists at the National Institutes of Health, the US’s leading medical research agency, were swept up Tuesday in the Trump administration’s latest firing blitz.

In what world you can justify firing Richard Youle?!? #autophagy #mitophagy www.wired.com/story/doctor...

03.04.2025 05:42 πŸ‘ 12 πŸ” 4 πŸ’¬ 2 πŸ“Œ 0
β€œRace does not provide an accurate representation of human biological variation,” the statement reads. β€œHumans are not divided biologically into distinct continental types or racial genetic clusters. Instead, the Western concept of race must be understood as a classification system that emerged from, and in support of, European colonialism, oppression, and discrimination.”

β€œIt thus does not have its roots in biological reality, but in policies of discrimination,” the statement says. β€œBecause of that, over the last five centuries, race has become a social reality that structures societies and how we experience the world. In this regard, race is real, as is racism, and both have real biological consequences.”

β€œRace does not provide an accurate representation of human biological variation,” the statement reads. β€œHumans are not divided biologically into distinct continental types or racial genetic clusters. Instead, the Western concept of race must be understood as a classification system that emerged from, and in support of, European colonialism, oppression, and discrimination.” β€œIt thus does not have its roots in biological reality, but in policies of discrimination,” the statement says. β€œBecause of that, over the last five centuries, race has become a social reality that structures societies and how we experience the world. In this regard, race is real, as is racism, and both have real biological consequences.”

Trump's 3/27 executive order targets the Smithsonian for advancing "the view that race is not a biological reality but a social construct."

Trump argues that the exhibit's statement, below, is unscientific. He's wrong. As a biology professor and population geneticist, I agree with every word of it.

31.03.2025 23:27 πŸ‘ 3872 πŸ” 971 πŸ’¬ 70 πŸ“Œ 57

Fondly remember Jan for his enthusiasm, rigorous science, and the kind person that he was.

29.03.2025 17:53 πŸ‘ 6 πŸ” 2 πŸ’¬ 0 πŸ“Œ 0

great to see it out, Irina!

21.03.2025 06:05 πŸ‘ 1 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0
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Under pressure | EMBO reports EMBO Press is an editorially independent publishing platform for the development of EMBO scientific publications.

"The rejection of grant applications or the alteration of the published record on account of the use of terms such as β€˜bias’, β€˜gender’, β€˜ethnicity’ and even β€˜female’ is unacceptable. EMBO Press joins other journals in not allowing such changes" πŸ’ͺπŸ»πŸ‘πŸ»πŸ‘πŸ»πŸ‘πŸ» www.embopress.org/doi/full/10....

20.03.2025 08:19 πŸ‘ 27 πŸ” 9 πŸ’¬ 1 πŸ“Œ 0

It's infinitely sad to see what is happening. the disregard of laws, advice and justice in our immigration policy plans, the total implosion of human values overseas. I feel just a bystander reeling in shock.

17.03.2025 16:44 πŸ‘ 9 πŸ” 1 πŸ’¬ 0 πŸ“Œ 0

Today Jan Drenth would have been 100 years, but sadly he passed away last week.
He was the founding father of structural biology in the Netherlands and his modesty, his gentle humor and his generosity set the spirit for the amazing environment in Groningen where i did my PhD.

20.02.2025 12:58 πŸ‘ 30 πŸ” 8 πŸ’¬ 0 πŸ“Œ 2

Today, the same as every other damn day, trans rights are human rights

30.01.2025 01:07 πŸ‘ 302 πŸ” 82 πŸ’¬ 0 πŸ“Œ 2
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Are you graduating this year and ready to start your career in the most meaningful way? This is your chance to get on board. #PhD #CancerResearch ➑️ nki.nl/careers-study/phd-students/nki-phd-program-2025/

24.01.2025 12:09 πŸ‘ 9 πŸ” 8 πŸ’¬ 0 πŸ“Œ 1

I am really excited to have the opportunity to continue to do science at the Hubrecht Institute @hubrechtinstitute.bsky.social! Thank you for the support!

24.01.2025 10:49 πŸ‘ 43 πŸ” 1 πŸ’¬ 5 πŸ“Œ 0
FIB-SEM dataset visualized with Microscopy Nodes, data from Mocaer et al 2023

FIB-SEM dataset visualized with Microscopy Nodes, data from Mocaer et al 2023

Microscopy Nodes is now up on bioRxiv! πŸš€

This is a Blender extension that seamlessly integrates and visualizes 3D microscopy data (TIF & @zarr.dev).

High-quality volume rendering for anyone, in both EM and fluorescence, regardless of computational expertise! πŸ”¬

www.biorxiv.org/content/10.1...

15.01.2025 13:39 πŸ‘ 333 πŸ” 124 πŸ’¬ 9 πŸ“Œ 12

The NKI call for PhD students is now open, with more information on our project on the website, More info: bit.ly/3O4bOjq

08.01.2025 07:27 πŸ‘ 9 πŸ” 5 πŸ’¬ 0 πŸ“Œ 0

Despite the black picture below, we're really happy to have this illuminating story online! Careful molecular mechanistic from Niels and others in the lab work giving unexpected biological insight!

17.12.2024 14:09 πŸ‘ 27 πŸ” 8 πŸ’¬ 0 πŸ“Œ 0

We have an opening for a PhD student, for a cryo-EM/biochemistry project at the interface of ubiquitin and DNA repair. Enthousiasm and experience with protein biochemistry and/or structural biology really important. Recruitment will fall under the the NKI PhD program, please see below

16.12.2024 13:12 πŸ‘ 12 πŸ” 7 πŸ’¬ 1 πŸ“Œ 1
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Dynamic regulation of the oxidative stress response by the E3 ligase TRIP12 The oxidative stress response is centered on the transcription factor NRF2 and protects cells from reactive oxygen species (ROS). While ROS inhibit the E3 ligase CUL3-KEAP1 to stabilize NRF2 and elici...

Excited to report our discovery of an important component of the oxidative stress response: the E3 ligase TRIP12. It acts as a chain elongation factor that amplifies CUL3-KEAP1 activity to drive NRF2 degradation as cells recover from stress.

www.biorxiv.org/content/10.1...

26.11.2024 14:53 πŸ‘ 74 πŸ” 25 πŸ’¬ 5 πŸ“Œ 0
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Could't think of a better inaugural post here. Very excited to share that our manuscript on the "Discovery and mechanism of K63-linkage-directed deubiquitinase activity in USP53" was published today at Nature Chemical Biology. Congratulations Kim, Kai, and all authors! www.nature.com/articles/s41...

25.11.2024 16:37 πŸ‘ 109 πŸ” 18 πŸ’¬ 6 πŸ“Œ 2