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Human γ -trace, a Basic Microprotein: Amino Acid Sequence and Presence in the Adenohypophysis

Anders Grubb and Helge Lofberg
Proceedings of the National Academy of Sciences of the United States of America
Vol. 79, No. 9, [Part 1: Biological Sciences] (May 1, 1982), pp. 3024-3027
Stable URL: http://www.jstor.org/stable/11757
Page Count: 4
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Human γ -trace, a Basic Microprotein: Amino Acid Sequence and Presence in the Adenohypophysis
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Abstract

The amino acid sequence of human γ -trace, a basic microprotein without known function, was determined by automated Edman degradations of the carboxymethylated polypeptide chain and of fragments obtained by cyanogen bromide treatment and tryptic digestion after blocking of lysine residues. The single polypeptide chain contained 120 residues, and the calculated Mr was 13,260. A proline residue at position 3 was partly hydroxylated. The presence of γ -trace in a significant proportion of the cells in the anterior lobe of simian and human pituitary glands was demonstrated by immunohistochemical procedures with a rabbit antiserum against human γ -trace. The tissue localization and amino acid sequence of γ -trace indicated that this protein is connected with the peptidergic gastroenteropancreatic neuroendocrine system.

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