This domain is found in Period circadian protein homolog 3 from Mus musculus (Per3) and similar proteins predominantly found in vertebrates. Per3 is involved in the day-time dependent (circadian) regulation of many physiological, behavioural, and biochemical processes. This entry represents the first PAS domain (PAS-A) present in this protein. This domain shows a five-stranded antiparallel beta- sheet covered on one face by alpha-helices [1-4].

1: Structural and functional analyses of PAS domain interactions of the clock proteins Drosophila PERIOD and mouse PERIOD2. Hennig S, Strauss HM, Vanselow K, Yildiz O, Schulze S, Arens J, Kramer A, Wolf E; PLoS Biol. 2009;7:e94. PMID:19402751

2: Unwinding the differences of the mammalian PERIOD clock proteins from crystal structure to cellular function. Kucera N, Schmalen I, Hennig S, Ollinger R, Strauss HM, Grudziecki A, Wieczorek C, Kramer A, Wolf E; Proc Natl Acad Sci U S A. 2012;109:3311-3316. PMID:22331899

3: Crystal structure of the heterodimeric CLOCK:BMAL1 transcriptional activator complex. Huang N, Chelliah Y, Shan Y, Taylor CA, Yoo SH, Partch C, Green CB, Zhang H, Takahashi JS; Science. 2012;337:189-194. PMID:22653727

4: Structural Basis for Aryl Hydrocarbon Receptor-Mediated Gene Activation. Schulte KW, Green E, Wilz A, Platten M, Daumke O; Structure. 2017;25:1025-1033. PMID:28602820