Sad1 and UNC84 domain containing 1 (SUN1) is present in the inner nuclear envelope. It has a carboxyl-terminal domain called the SUN domain which is located in the space between the inner and outer nuclear membranes and an amino-terminal domain located in the nucleoplasm.
Synonyms: Anti-Sad1/unc-84 protein-like 1; Anti-UNC84A; Anti-Unc-84 homolog A
Storage: -20C
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Biochem Physiol Actions: Sad1 and UNC84 domain containing 1 (SUN1) plays an important role in linking telomeres with the nuclear envelope. It binds to telomere-binding proteins and helps in the formation of the meiotic bouquet. This is a special cluster formed by telomeres at the nuclear envelope and occurs before meiosis I. SUN1 also interacts with SUN2 to form heterodimers. This in turn helps in aiding the interaction between the nuclear envelope and the centrosome. It has also been shown that reforming nuclear envelope employs SUN1 to acetylate histones for de-condensation of DNA after mitosis. It is the one of the earliest factors to associate with segregated daughter chromosomes in anaphase.
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