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TitleStructural and biochemical basis of interdependent FANCI-FANCD2 ubiquitination.
Journal, issue, pagesEMBO J, Vol. 42, Issue 3, Page e111898, Year 2023
Publish dateFeb 1, 2023
AuthorsKimon Lemonidis / Martin L Rennie / Connor Arkinson / Viduth K Chaugule / Mairi Clarke / James Streetley / Helen Walden /
PubMed AbstractDi-monoubiquitination of the FANCI-FANCD2 (ID2) complex is a central and crucial step for the repair of DNA interstrand crosslinks via the Fanconi anaemia pathway. While FANCD2 ubiquitination ...Di-monoubiquitination of the FANCI-FANCD2 (ID2) complex is a central and crucial step for the repair of DNA interstrand crosslinks via the Fanconi anaemia pathway. While FANCD2 ubiquitination precedes FANCI ubiquitination, FANCD2 is also deubiquitinated at a faster rate than FANCI, which can result in a FANCI-ubiquitinated ID2 complex (I D2). Here, we present a 4.1 Å cryo-EM structure of I D2 complex bound to double-stranded DNA. We show that this complex, like ID2 and I D2 , is also in the closed ID2 conformation and clamps on DNA. The target lysine of FANCD2 (K561) becomes fully exposed in the I D2-DNA structure and is thus primed for ubiquitination. Similarly, FANCI's target lysine (K523) is also primed for ubiquitination in the ID2 -DNA complex. The I D2-DNA complex exhibits deubiquitination resistance, conferred by the presence of DNA and FANCD2. ID2 -DNA, on the other hand, can be efficiently deubiquitinated by USP1-UAF1, unless further ubiquitination on FANCI occurs. Therefore, FANCI ubiquitination effectively maintains FANCD2 ubiquitination in two ways: it prevents excessive FANCD2 deubiquitination within an I D2 -DNA complex, and it enables re-ubiquitination of FANCD2 within a transient, closed-on-DNA, I D2 complex.
External linksEMBO J / PubMed:36385258 / PubMed Central
MethodsEM (single particle)
Resolution4.14 Å
Structure data

14694

7zf1

EMDB-14694, PDB-7zf1:
Structure of ubiquitinated FANCI in complex with FANCD2 and double-stranded DNA
Method: EM (single particle) / Resolution: 4.14 Å

Source
  • homo sapiens (human)
  • synthetic construct (others)
KeywordsDNA BINDING PROTEIN / Fanconi anemia / DNA repair / ubiquitination / ID2 complex

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