It would also conditionally require the highest risk plants to implement the safest and most cost-effective processes where feasible.
Kacprzak et al. (2003) and Suliman et al. (2005) reported that methionine synthase gene in S. cerevisiae and A. nidulans was conditionally required and the deleterious effect of its deletion may be compensated by addition of methionine to the medium.
Thus the conditionally required or non-essential host factors are better candidates as anti-HIV-1 targets.
We also find that the previously uncharacterized protein Urn1 (Dre4 in Schizosaccharomyces pombe) directly interacts with Prp19, and that Dre4 is conditionally required for pre-mRNA splicing in S. pombe.
For clarity, we will frequently refer to S. cerevisiae proteins with the prefix Sc and S. pombe proteins with the prefix Sp. From both yeasts, ScUrn1/SpDre4 purifications contain multiple known splicing factors, U2, U5, and U6 snRNAs and SpDre4 is conditionally required for pre-mRNA splicing.
In yeast, peroxisomes are conditionally required, and their size and abundance can change dramatically with growth condition.
MIN2 may be conditionally required for stability of photoreceptor molecules at a stage of the eyespot assembly process in conjunction with MLT1 function, whereas it is not required for photoreceptor stability in the organized eyespot layers.
Only half of the required (or conditionally required) tests of environmental fate use the formulated product, as do only a quarter of the tests for effects on wildlife and nontarget plants (U.S. EPA 2005a, Parts 158.290, 158.340, 158.490, and 158.540).
Of the 20 toxicologic tests required (or conditionally required) to register a pesticide in the United States, only 7 short-term acute toxicity tests use the pesticide formulation; the rest are done with only the active ingredient.
Prp22 has a primary role in promoting mRNA release, which requires the ATPase function of the protein, and is conditionally required for the second reaction in positioning the 3′ splice site in an ATP-independent manner.
Since initial λ phage display fusions to the gpV major tail (Dunn 1995), phage display fusions have since moved onto expression on gpD which confer a high decoration capacity per phage particle (up to 420), (Mikawa et al. 1996; Maruyama et al. 1994) and provide a selectable phenotype as a conditionally required packaging protein for full-length λ genome.
