期刊
MOLECULAR BIOLOGY OF THE CELL
卷 18, 期 10, 页码 3966-3977出版社
AMER SOC CELL BIOLOGY
DOI: 10.1091/mbc.E07-03-0295
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Proteins share peptidic sequences, such as a nuclear localization signal (NLS), which guide them to particular membranebound compartments. Similarities have also been observed within different classes of signals that target proteins to membrane-less subnuclear compartments. Common localization signals affect spatial and temporal subcellular organization and are thought to allow the coordinated response of different molecular networks to a given signaling cue. Here we identify a higher-order and predictive code, {[RR(I/L)X(3)r]((n, n >= 1))+[L phi/N)((n, n > 1))}, that establishes high-affinity interactions between a group of proteins and the nucleolus in response to a specific signal. This position-independent code is referred to as a nucleolar detention signal regulated by H+ (NoDSH+) and the class of proteins includes the cIAP2 apoptotic regulator, VHL ubiquitylation factor, HSC70 heat shock protein and RNF8 transcription regulator. By identifying a common subnuclear targeting consensus sequence, our work reveals rules governing the dynamics of subnuclear organization and ascribes new modes of regulation to several proteins with diverse steady-state distributions and dynamic properties.
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