By A. D. Smith
Booklet by way of Smith, A. D.
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However, there is no direct evidence to support such a sequence of events. In addition to this role of calcium in an early stage of granule formation, which may be a general func tion for protein storing organelles, its uptake into chromaffin granules certainly serves a second pur pose. , 1974). New granules have, therefore, to accumu late this metal ion in order to form the calcium/nucleotide core of the complex (see next section). e. catecholamines, ATP and calcium, have to replenish these losses by a continuous calcium uptake.
1. ; mainly noradrenaline; see text) in the gradient is given. Newly synthesized catecholamines are present in mature chromaf fin granules (MG). The position in the gradient of microsomes (MIC), lysosomes (LYS) and newly formed chromaffin granules (NG) is indicated (compare Fig. 1). The right histogram gives the distribu tion of 45 Ca 2+ in the gradient. In this experiment the perfusion was stopped 4 h after the 'pulse'. Radioactive calcium was taken up and retained by mature granules. 40 H. WINKLER of the exportable material' in the early stages of granule formation.
Newly formed chromaffin granules which con tain [3H]fucose labelled proteins were less dense than mature granules. About 80% of the labelled soluble proteins were adsorbed by Concanavalin A, which in dicates that most of the [3H]fucose had been incor porated into dopamine /Miydroxylase, since the enzyme binds specifically to this lectin (see RUSH, THOMAS, KINDLER MIRAS-PORTUGAL & UDENFRIEND, & MANDEL, 1974; AUNIS, 1974; WALLACE & LOVENBERG, 1974). The membranes of these newly assembled granules were not significantly labelled.
Commentaries in the Neurosciences by A. D. Smith