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== 一.衔接蛋白 ==
衔接蛋白有两类：AP1-5和GGA1-3.

AP复合体都是异四聚体，有五种，组成为（β）+（α/γ/δ/ε/ζ）+（μ）+（σ）
{| class="wikitable"
! !! 亚基组成 !! 定位 !! 分选模体 !! 包被蛋白 !! 磷脂 !! 小GTP酶 !! 功能
|-
| AP-1 || γ1/2, β1, μ1A/B, σ1A/B/C || TGN/endosomes || YXXØ, [DE]XXXL[LI] || Clathrin || PI4P? || Arf-1 || TGN↔endosomes, Polarized sorting
|-
| AP-2 || αA/C, β2, μ2, σ2 || Plasma membrane || YXXØ, [DE]XXXL[LI] || Clathrin || PIP2 || Arf-6? || Clathrin-dependent endocytosis
|-
| AP-3 || δ, β3A/B, μ3A/B, σ3A/B || Endosomes || YXXØ, [DE]XXXL[LI] || Clathrin? || Unknown || Arf-1 || LRO biogenesis
|-
| AP-4 || ε, β4, μ4, σ4 || TGN || YX[FYL][FL]E || Unknown || Unknown || Arf-1 || TGN→endosomes, Polarized sorting
|-
| AP-5 || ζ, β5, μ5, σ5 || Late endosomes || Unknown || SPG11/SPG15? || PI3P? || Unknown || Unknown
|}
[[文件:AP和GGA.png|缩略图]]
GGA都是单体蛋白，有三种。