Three forms of rat basic fibroblast growth factor are made from a single mRNA and localize to the nucleus.

Abstract:

:The molecular weight of rat basic fibroblast growth factor is predicted to be 18 kDa when the amino acid sequence is read from the single AUG initiation codon found in the cDNA. DNA sequencing upstream of this AUG codon indicated, however, that there was an extended open reading frame. In vitro translation of the rat cDNA for basic FGF gave three proteins of 18.0, 21.5, and 22.0 kDa in equal abundance. The same proteins were produced in vivo by COS cells transfected with the rat cDNA. Deletion of 81 base pairs from the reading frame upstream of the AUG codon resulted in the expression of only one protein observed at 18.0 kDa. These results indicated that the 22.0 and 21.5 kDa forms of rat basic FGF were formed when translation initiates at the alternative upstream non-AUG codons. Rat cell lines and tissues were found to express all three forms of basic FGF protein. The cDNA was used to analyze the subcellular distribution of the different forms of rat basic FGF. Subcellular fractionation and immunofluorescence of transfected COS cells showed that all three forms of the protein localized preferentially in the nucleus. Expression of a truncated cDNA from which 81 base pairs (27 amino acids) of the upstream reading frame had been deleted, showed localization of the smaller form of bFGF alone in the nucleus. These results demonstrated that although the amino acids that were deleted from the N-terminus of rat basic fibroblast growth factor have a sequence characteristic of nuclear localization motifs, they are not obligatory for the transport of the growth factor into the nucleus. Nuclear extracts taken from transfected cells also contained two smaller proteins of 16 and 12 kDa that were detected by Western blot analysis. It is possible that these are proteolytic products of bFGF.

journal_name

J Cell Physiol

authors

Powell PP,Klagsbrun M

doi

10.1002/jcp.1041480204

subject

Has Abstract

pub_date

1991-08-01 00:00:00

pages

202-10

issue

2

eissn

0021-9541

issn

1097-4652

journal_volume

148

pub_type

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