This is the TPR domain from Fanconi-associated nuclease 1 (FAN1), which mediates inter-domain interactions and is part of the dimerization interface [1]. FAN1 is a DNA structure-specific nuclease involved in processing DNA interstrand crosslinks. FAN1 maintains genomic stability and prevents tissue decline in multiple organs [1-3]. It mediates cancer drug resistance in several cancer subtypes.

1: Structural insights into 5' flap DNA unwinding and incision by the human FAN1 dimer. Zhao Q, Xue X, Longerich S, Sung P, Xiong Y; Nat Commun. 2014;5:5726. PMID:25500724

2: DNA repair. Mechanism of DNA interstrand cross-link processing by repair nuclease FAN1. Wang R, Persky NS, Yoo B, Ouerfelli O, Smogorzewska A, Elledge SJ, Pavletich NP; Science. 2014;346:1127-1130. PMID:25430771

3: Crystal structure of human Fanconi-associated nuclease 1. Yan PX, Huo YG, Jiang T; Protein Cell. 2015;6:225-228. PMID:25547363