Protein kinase C and annexins: unusual calcium response elements in the cell.

Abstract:

:Protein kinase C and the annexins appear to share some unusual and potentially important membrane- and calcium-binding properties. While these proteins are calcium response elements, they are not calcium-binding proteins in the formal sense; at intracellular calcium concentrations, they only bind significant amounts of calcium when membranes or other suitable surfaces are present. The number of calcium ions bound per protein is large (> 8) and this stoichiometry, at the protein-membrane interface, may provide the large number of contact points needed for the very high-affinity interaction that is observed. The further ability of annexins and PKC to form structures with properties of integral membrane proteins may be important to provide a type of long-term cell signalling that produces a constitutively active kinase or ion channel activity. Selectivity for phospholipids in bilayer form is modest with respect to the acidic phospholipids but there is a surprising preference for phosphatidylethanolamine as the neutral phospholipid matrix. Along with other unusual properties, these proteins offer the potential for unique types of cell regulation events.

journal_name

Cell Signal

journal_title

Cellular signalling

authors

Bazzi MD,Nelsestuen GL

doi

10.1016/0898-6568(93)90075-w

subject

Has Abstract

pub_date

1993-07-01 00:00:00

pages

357-65

issue

4

eissn

0898-6568

issn

1873-3913

pii

0898-6568(93)90075-W

journal_volume

5

pub_type

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