Recombinant human chromosomal proteins HMG-14 and HMG-17.
AUTOR(ES)
Bustin, M
RESUMO
Vectors for expressing human chromosomal proteins HMG-14 and HMG-17 in bacterial cultures under the control of the temperature-inducible lambda PL promoter have been constructed. The open reading frames of the cDNAs have been amplified by the polymerase chain reaction (PCR), utilizing amplimers containing desired restriction sites, thereby facilitating precise location of the initiation codon downstream from a ribosomal binding site. Expression of the recombinant proteins does not significantly affect bacterial growth. The rate of synthesis of the recombinant proteins is maximal during the initial stages of induction and slows down appreciably with time. After an initial burst of protein synthesis, the level of the recombinant protein in the bacterial extracts remains constant at different times following induction. Methods for rapid extraction and purification of the recombinant proteins are described. The recombinant proteins are compared to the proteins isolated from eucaryotic cells by electrophoretic mobility, Western analysis and nucleosome core mobility-shift assays. The ability of the proteins to shift the mobility of the nucleosome cores, but not that of DNA, can be used as a functional assay for these HMG proteins. A source for large quantities of human chromosomal proteins HMG-14 and HMG-17 will facilitate studies on their structure, cellular function and mechanism of interaction with nucleosomes.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=328279Documentos Relacionados
- Nonhistone chromatin proteins HMG-14 and HMG-17 bind preferentially to single-stranded DNA.
- Modular structure of chromosomal proteins HMG-14 and HMG-17: definition of a transcriptional enhancement domain distinct from the nucleosomal binding domain.
- Cell cycle regulated synthesis of an abundant transcript for human chromosomal protein HMG-17.
- Mouse non-histone chromosomal protein HMG-14 cDNA sequence.
- Chromosomal protein HMG-14 gene maps to the Down syndrome region of human chromosome 21 and is overexpressed in mouse trisomy 16.