Transports CMP-sialic acid from the cytosol into Golgi vesicles where glycosyltransferases function . Efficient CMP-sialic acid uptake depends on the presence of free CMP inside the vesicles, suggesting the proteins functions as an antiporter. Binds both CMP-sialic acid and free CMP, but has higher affinity for free CMP (By similarity).
Golgi apparatus membrane ; Multi-pass membrane protein .
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