Rab11-family interacting proteins define spatially and temporally distinct regions within the dynamic Rab11a-dependent recycling system

被引:59
作者
Baetz, Nicholas W. [1 ,2 ]
Goldenring, James R. [1 ,2 ,3 ,4 ,5 ]
机构
[1] Vanderbilt Univ, Sch Med, Sect Surg Sci, Nashville, TN 37232 USA
[2] Vanderbilt Univ, Sch Med, Epithelial Biol Ctr, Nashville, TN 37232 USA
[3] Vanderbilt Univ, Sch Med, Dept Cell & Dev Biol, Nashville, TN 37232 USA
[4] Vanderbilt Ingram Canc Ctr, Nashville, TN 37232 USA
[5] Nashville VA Med Ctr, Nashville, TN 37232 USA
基金
美国国家卫生研究院;
关键词
LOW-DENSITY-LIPOPROTEIN; RAB-COUPLING PROTEIN; GTP-BINDING PROTEIN; TRANS-GOLGI NETWORK; MYOSIN-VB; PLASMA-MEMBRANE; RAB11-INTERACTING PROTEINS; STRUCTURED ILLUMINATION; MOLECULAR-CLONING; HUMAN-FIBROBLASTS;
D O I
10.1091/mbc.E12-09-0659
中图分类号
Q2 [细胞生物学];
学科分类号
071009 ; 090102 ;
摘要
The Rab11-family interacting proteins (Rab11-FIPs) facilitate Rab11-dependent vesicle recycling. We hypothesized that Rab11-FIPs define discrete subdomains and carry out temporally distinct roles within the recycling system. We used live-cell deconvolution microscopy of HeLa cells expressing chimeric fluorescent Rab11-FIPs to examine Rab11-FIP localization, transferrin passage through Rab11-FIP-containing compartments, and overlap among Rab11-FIPs within the recycling system. FIP1A, FIP2, and FIP5 occupy widely distributed mobile tubules and vesicles, whereas FIP1B, FIP1C, and FIP3 localize to perinuclear tubules. Internalized transferrin entered Rab11-FIP-containing compartments within 5 min, reaching maximum colocalization with FIP1B and FIP2 early in the time course, whereas localization with FIP1A, FIP1C, FIP3, and FIP5 was delayed until 10 min or later. Whereas direct interactions with FIP1A were only observed for FIP1B and FIP1C, FIP1A also associated with membranes containing FIP3. Live-cell dual-expression studies of Rab11-FIPs revealed the tubular dynamics of Rab11-FIP-containing compartments and demonstrated a series of selective associations among Rab11-FIPs in real time. These findings suggest that Rab11-FIP1 proteins participate in spatially and temporally distinct steps of the recycling process along a complex and dynamic tubular network in which Rab11-FIPs occupy discrete domains.
引用
收藏
页码:643 / 658
页数:16
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