A C-terminal sequence from ox growth hormone

A chromatographic preparation of ox growth hormone

1. A method is described for the chromatographic preparation of ox growth hormone. It involves chromatography of an extract of anterior pituitary lobes on DEAE-cellulose, followed by rechromatography on a dextran gel of low cross-linkage (Sephadex G-100). 2. The product is highly active in growth-hormone assays, and is obtained in good yield. It was homogeneous by several criteria, but showed some heterogeneity on starch-gel electrophoresis. 3. The molecular weight of the hormone was estimated from its behaviour on gel-filtration columns under various conditions. Evidence that the hormone may dissociate into sub-units under some conditions is presented.

Chromatofocusing of N-terminally processed forms of proteins. Isolation and characterization of two forms of interleukin-1 beta and of bovine growth hormone

Using chromatofocusing, two fractions have been obtained from recombinant-derived interleukin-1 beta (IL-1 beta) and from pituitary-derived bovine growth hormone (BGH). The forms of both proteins responsible for these fractions have been characterized by N-terminal and C-terminal amino acid sequence determination. Recombinant IL-1 beta, as a mixture of correctly processed polypeptide and an N-terminally methionylated form, was resolved rapidly by chromatofocusing. BGH was resolved into the full-length polypeptide commencing Ala-Phe-Pro-Ala-Met-Ser-Leu- and a form truncated at the N-terminus by four amino acid residues, which thus commences Met-Ser-Leu-; the fraction containing the truncated form also contains a species having N-terminal Phe-Pro-Ala-. These results, and the possible generality of the separation, are discussed.

Amino acid sequences around the cystine residues in horse growth hormone

The cystine-containing peptides of horse growth hormone were isolated and their amino acid sequences determined. Four unique half-cystine residues occur in two peptides, one containing 11 and the other, at the C-terminus of the protein, 15 amino acids. These sequences are compared with published data on growth hormones from other species.