A social stigma

Article Abstract:

Takasaki and colleagues have demonstrated that the SRK gene of Brassica campestris has control over the ability of the pistil to recognize and reject self pollen. SLG had previously been shown to be needed for adhesion of pollen to the stigma, which could involve its interaction with pollen-coat proteins of the same family as SCR/SP11. The Brassica self-incompatibility system may have arisen by hijacking a pre-existing system.

Genetic aspects, Brassica

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Identification of the pollen determinant of S-RNase-mediated self-incompatibility

Article Abstract:

The identification and characterization of PiSLE, an S-locus F-box gene of Petunia inflata is reported. The study represented that transformation of S1S1, S1S2 and S2S3 plants with the S2-allele of PiSLF causes breakdown of their pollen function is consistent with 'competitive interaction' in which pollen carrying two different pollen S-alleles fails to function in self-incompatibility.

Science & research, Pollen, Petunia

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Increased and altered DNA binding of human p53 by S and G2/M but not G1 cyclin-dependent kinases

Article Abstract:

Human p53 is involved in sequence specific interaction with the cell cycle and apoptosis genes and S and G2/M cyclin-dependent kinases (Cdk) may regulate these interactions. S and G2/M Cdks phosphorylate p53 both selectively and efficiently, stimulating the sequence specific DNA binding and causing p53 to undergo a distinctive conformational change.

Cell death, Proteases, Cellular control mechanisms, Cell regulation, DNA binding proteins

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