However, ubiquitin also has important roles in modifying the function of individual proteins required for specific processes, e.g. ubiquitination of PCNA (proliferating cell nuclear antigen) is required for bypass of replication blocking lesions in DNA [6], [7], [8].
Even so, bypass of blocking lesions in mammalian cells is often carried out by two polymerases.
(22) These low-fidelity DNA polymerases bypass many replication blocking lesions, and in many cases, they do it at an appreciably high rate of error.
The observation that deficiency in TCR enhances UV-induced Rpb1 sumoylation can be explained by the persistence (or slower removal) of transcription-blocking lesions in the transcribed strand of the genes, as the mere impairment of transcription elongation by MPA treatment also induces Rpb1 sumoylation (Fig. 1D).
It was hypothesized that Stage 1 seizures evoked in the injured hemisphere prevent recovery by blocking lesion-induced bFGF expression in structures shown to be important for recovery after cortex lesions (e.g., striatum).
Fundus flourescein angiography revealed early blocked fluorescence in the lesion, network of retinal vessels forming retinal angiomatosis proliferans (RAP) lesions with late pooling of dye.
In parallel to its ability to block noradrenalin, vitamin E also blocked formation of gastric lesions in the rats exposed to stress.
The pattern separation function of the DG is supported by accumulating evidence from behavioral studies, reporting that animals with lesions or blocked plasticity in the DG were impaired in discriminating similar spatial and contextual information (Gilbert et al., 2001; McHugh et al., 2007; Goodrich-Hunsaker et al., 2008; Nakashiba et al., 2012).
The present study circumvents the replication block of these bulky lesions by placing the lesion in the single-stranded template strand of short-gapped DNA.
