In this report, we investigate the mechanisms that regulate Drosophila histone H1 expression and its association with chromatin in vivo. We show that histone H1 is subject to negative autoregulation and exploit this result to examine the effects of mutations of the main phosphorylation site of histone H1.

Multiple non-allelic subtypes of histone H1 have been detected in higher organisms. These specific variants with distinct structural features may differ in their ability to condense chromatin and hence modify transcriptional activity. Such functional divergence between H1 subtypes has still not been established definitively, but it cannot be excluded that the role of a particular subtype may de...

Nm23 genes, which encode nucleoside diphosphate kinases, have been implicated in suppressing tumor metastasis. The motility of human breast carcinoma cells can be suppressed by transfection with wild-type nm23-H1, but not by transfections with two nm23-H1 mutants, nm23-H1(S12OG) and nm23-H1(P96S). Here we report that nm23-H1 can transfer a phosphate from its catalytic histidine to aspartate or ...

.................................................................................................. 10 POPULÄRVETENSKAPLIG SAMMANFATTNING............................. 12 PAPERS IN THE PRESENT THESIS ....................................................... 15 ABBREVIATIONS ....................................................................................... 16 INTRODUCTION..........................

Histone H1 plays a crucial role in stabilizing higher order chromatin structure. Transcriptional activation, DNA replication, and chromosome condensation all require changes in chromatin structure and are correlated with the phosphorylation of histone H1. In this study, we describe a novel interaction between Pin1, a phosphorylation-specific prolyl isomerase, and phosphorylated histone H1. A su...

An antiserum specific for the globular domain of the bovine very lysine-rich histone subfraction H1(0) cross-reacted with a single protein band in the chromosomal proteins isolated from microplasmodia of the true slime mold Physarum polycephalum. Its amino acid composition was characteristic of a very lysine-rich histone which supported its identification as Physarum H1(0). Unlike Physarum H1(0...