Isolation and NH2-terminal sequence of a highly conserved human and porcine pituitary protein belonging to a new superfamily. Immunocytochemical localization in pars distalis and pars nervosa of the pituitary and in the supraoptic nucleus of the hypothala

Abstract:

:The isolation and purification of a 21,000-Da (pI 4.9) novel protein from porcine anterior pituitary and whole human pituitary is described. Comparison of the NH2-terminal sequence of the first 77 and 81 residues of the human and porcine homologs shows only one conservative substitution at residue 12, namely an Ala for a Thr between these two species. Such high sequence homology is also reflected in their amino acid composition. A computer data-bank search using a mutation data matrix and comparison with 338,327 segments of proteins revealed that this substance should be classified as belonging to a new protein superfamily. Immunocytochemical staining, using an antibody produced against a synthetic fragment, revealed the presence of immunostainable material in the anterior and posterior lobe of the pituitary and in the supraoptic nucleus of the hypothalamus. No staining was observed in the intermediate lobe of the pituitary. Furthermore, purified neurointermediate lobe secretory granule preparations were also shown to contain this novel polypeptide.

journal_name

Arch Biochem Biophys

authors

Seidah NG,Hsi KL,De Serres G,Rochemont J,Hamelin J,Antakly T,Cantin M,Chrétien M

doi

10.1016/0003-9861(83)90063-2

subject

Has Abstract

pub_date

1983-09-01 00:00:00

pages

525-34

issue

2

eissn

0003-9861

issn

1096-0384

pii

0003-9861(83)90063-2

journal_volume

225

pub_type

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