Function
Integrator complex (Int) is a protein complex which induces termination at loci transcribed by RNA polymerase II. Multiple Int subunits coordinate effective termination[1]. Int consists of 14 subunits some of which act as RNA endonuclease and are essential for small nuclear RNA biogenesis[2]. Int has protein phosphatase activity as well[3].
Disease
Mutations in Int subunit 1 and 8 are associated with rare recessive neurodevelopmental syndromes[4]. Mutations in Int subunit 13 are associated with oral-facial-digital syndromes[5].
Structural highlights
One of the pathways for fixing breaks in double-stranded DNA involve the participation of Int subunit 3 dimer and Int subunit 6. The 3D structure of the complex of the C-termini of Int3 dimer and Int6 shows the hydrophobic core interactions forming the Int3 dimer and the hydrophobic and ionic interactions between Int3 and Int6[6].
- Two Int3 protomers form a wherein two protomers are related by a non-crystallographic two-fold axis.
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- . These hydrophobic interactions are further strengthened .
Integrator complex 3D structures
Integrator complex 3D structures