SNARE timing in sperm acrosome exocytosis

Sperm acrosome exocytosis proceeds via ordered SNARE assembly/disassembly around intra-acrosomal Ca2+ release.

Source

Dynamics of SNARE assembly and disassembly during sperm acrosomal exocytosis

De Blas GA, Roggero CM, Tomes CN, et al. · PLoS biology · 2005

Study at a glance

Design: Animal / in-vitro — Staged inhibitors and photolabile Ca²⁺ chelators in permeabilized sperm to order fusion factors
N: Cell-biology ordering experiments — no single primary analytic N in stored text
Population: Permeabilized sperm undergoing acrosomal exocytosis
Outcome: Temporal order of Rab3A and SNARE/synaptotagmin steps in acrosomal fusion

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SNARE timing in sperm acrosome exocytosis

These passages occur verbatim in the stored paper text. They support the points listed below; they do not verify every statement in the explanation.

Sperm acrosomal exocytosis.

Several of the proteins involved have been identified and characterized by genetic approaches, reconstitution assays, and biochemical means.

SNARE proteins and regulators.

The current consensus paradigm for membrane fusion is based on results obtained from diverse cellular systems, ranging from yeast to neurons.

What they did

Used staged inhibitors and photolabile Ca2+ chelators in permeabilized sperm to order fusion factors.

Rab3A acts before intra-acrosomal Ca2+ efflux; SNAREs/synaptotagmin act after to complete fusion.

The limits

In vitro permeabilized sperm may not capture every in vivo regulatory layer.

Key terms

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Topic:

Common questions

Before Ca2+?

Rab3A.

After Ca2+?

SNAREs/synaptotagmin.

Process?

Acrosome exocytosis.

Model?

Sperm.