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Nucleic Acids Research, 1991, Vol. 19, No. 11 3115-3121
© 1991

MOLECULAR BIOLOGY

Recombinant human chromosomal proteins HMG-14 and HMG-17

Michael Bustin*, Patricia S. Becerra1, Massimo P. Crippa, Donald A. Lehn, James M. Pash and Joseph Shiloach2

Laboratory of Molecular Carcinogenesis, National Institutes of Health Bethesda, MD 20892, USA 1Biochemistry, NCI, National Institutes of Health Bethesda, MD 20892, USA 2Biotechnology Unit, NIDDK, National Institutes of Health Bethesda, MD 20892, USA

*To whom correspondence should be addressed at Building 37, Room 3D-12, NCI, NIH, Bethesda, MD 20892, USA

Received December 19, 1990. Revised February 12, 1991. Accepted February 12, 1991.

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.


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