Cpf1 is an RNA-guided endonuclease of a type V CRISPR-Cas system. Cpf1 adopts a bilobed architecture consisting of an alpha-helical recognition (REC) lobe and a nuclease (NUC) lobe, with the small CRISPR RNAs (crRNAs)-target DNA heteroduplex bound to the positively charged, central channel between the two lobes. The REC lobe consists of the REC1 and REC2 domains where REC1 comprises 13 alpha helices, and REC2 comprises ten alpha helices and two beta strands that form a small antiparallel sheet [1]. This entry represents REC1 domain.

1: Structural Basis for Guide RNA Processing and Seed-Dependent DNA Targeting by CRISPR-Cas12a. Swarts DC, van der Oost J, Jinek M; Mol Cell. 2017;66:221-233. PMID:28431230