Protein kinase C (PKC) is a family of serine- and threonine-specific protein kinases that can be activated by calcium and the second messenger diacylglycerol. PKC family members phosphorylate a wide variety of protein targets and are known to be involved in diverse cellular signaling pathways. PKC family members also serve as major receptors for phorbol esters, a class of tumor promoters. Each member of the PKC family has a specific expression profile and is believed to play distinct roles in cells. The protein encoded by this gene is one of the PKC family members. Studies both in human and mice demonstrate that this kinase is involved in B cell signaling and in the regulation of growth, apoptosis, and differentiation of a variety of cell types. Alternatively spliced transcript variants encoding the same protein have been observed.
PRKCD,ALPS3,CVID9,MAY1,PKCD,nPKC-delta,PKCδ,PKC delta (Phospho-Tyr64) Antibody,Tyrosine-protein kinase PRKCD,Sphingosine-dependent protein kinase-1,PKC delta (Phospho-Tyr64)
功能
Calcium-independent, phospholipid- and diacylglycerol (DAG)-dependent serine/threonine-protein kinase that plays contrasting roles in cell death and cell survival by functioning as a pro-apoptotic protein during DNA damage-induced apoptosis, but acting as an anti-apoptotic protein during cytokine receptor-initiated cell death, is involved in tumor suppression as well as survival of several cancers, is required for oxygen radical production by NADPH oxidase and acts as positive or negative regulator in platelet functional responses. Negatively regulates B cell proliferation and also has an important function in self-antigen induced B cell tolerance induction. Upon DNA damage, activates the promoter of the death-promoting transcription factor BCLAF1/Btf to trigger BCLAF1-mediated p53/TP53 gene transcription and apoptosis. In response to oxidative stress, interact with and activate CHUK/IKKA in the nucleus, causing the phosphorylation of p53/TP53. In the case of ER stress or DNA damage-induced apoptosis, can form a complex with the tyrosine-protein kinase ABL1 which trigger apoptosis independently of p53/TP53. In cytosol can trigger apoptosis by activating MAPK11 or MAPK14, inhibiting AKT1 and decreasing the level of X-linked inhibitor of apoptosis protein (XIAP), whereas in nucleus induces apoptosis via the activation of MAPK8 or MAPK9. Upon ionizing radiation treatment, is required for the activation of the apoptosis regulators BAX and BAK, which trigger the mitochondrial cell death pathway. Can phosphorylate MCL1 and target it for degradation which is sufficient to trigger for BAX activation and apoptosis. Is required for the control of cell cycle progression both at G1/S and G2/M phases. Mediates phorbol 12-myristate 13-acetate (PMA)-induced inhibition of cell cycle progression at G1/S phase by up-regulating the CDK inhibitor CDKN1A/p21 and inhibiting the cyclin CCNA2 promoter activity. In response to UV irradiation can phosphorylate CDK1, which is important for the G2/M DNA damage checkpoint activation. Can protect glioma cells from the apoptosis induced by TNFSF10/TRAIL, probably by inducing increased phosphorylation and subsequent activation of AKT1. Is highly expressed in a number of cancer cells and promotes cell survival and resistance against chemotherapeutic drugs by inducing cyclin D1 (CCND1) and hyperphosphorylation of RB1, and via several pro-survival pathways, including NF-kappa-B, AKT1 and MAPK1/3 (ERK1/2). Can also act as tumor suppressor upon mitogenic stimulation with PMA or TPA. In N-formyl-methionyl-leucyl-phenylalanine (fMLP)-treated cells, is required for NCF1 (p47-phox) phosphorylation and activation of NADPH oxidase activity, and regulates TNF-elicited superoxide anion production in neutrophils, by direct phosphorylation and activation of NCF1 or indirectly through MAPK1/3 (ERK1/2) signaling pathways. May also play a role in the regulation of NADPH oxidase activity in eosinophil after stimulation with IL5, leukotriene B4 or PMA. In collagen-induced platelet aggregation, acts a negative regulator of filopodia formation and actin polymerization by interacting with and negatively regulating VASP phosphorylation. Downstream of PAR1, PAR4 and CD36/GP4 receptors, regulates differentially platelet dense granule secretion; acts as a positive regulator in PAR-mediated granule secretion, whereas it negatively regulates CD36/GP4-mediated granule release. Phosphorylates MUC1 in the C-terminal and regulates the interaction between MUC1 and beta-catenin. The catalytic subunit phosphorylates 14-3-3 proteins (YWHAB, YWHAZ and YWHAH) in a sphingosine-dependent fashion (By similarity). Phosphorylates ELAVL1 in response to angiotensin-2 treatment (PubMed:18285462).
a. 贴壁培养细胞收集
去除贴壁细胞的培养液，用PBS、NS或无血清培养基清洗1次，低速离心，弃上清，留取沉淀。
b. 悬浮培养细胞收集
速离心悬浮细胞，弃上清，收集沉淀。手指轻弹细胞，使其松散。
c. 组织样本收集
把组织剪切成细小的碎片，越小越好。取液氮或超低温冰箱中冷冻30min以上的组织，迅速用液氮研磨，研磨过程尽量控制在1~2min之内，以减少蛋白的降解。
（2）总蛋白提取
a. 细胞/组织裂解
将装有细胞沉淀或组织碎片的容器完全插入冰中。细胞沉淀按照1mL裂解液/107个细胞(1个T75培养瓶细胞量)的比例加入相应体积的裂解液（细胞量足够时都加入3mL，不足时根据细胞量计算），裂解20min，每隔5min将离心管置于涡旋振荡仪上震荡10s。组织碎片按照0.5mL 裂解液/100mg组织向匀浆器中加入蛋白裂解液，每3min研磨一次，重复5次，使组织尽量碾碎。（裂解液中根据需要选择添加或不添加蛋白酶抑制剂）。
b. 离心
把裂解好的样品配平后，置于预冷的高速冷冻离心机中，12000 rpm，15min。
c. 蛋白变性
完成离心后，上清即为蛋白提取液。吸取少量蛋白提取液做蛋白浓度测定。向剩余的蛋白提取液的离心管中加入1/5上清体积的5×Loading Buffer（最终工作液为1X），待干式恒温器温度升至95℃后，将1.5mL离心管插入加热孔中，95℃加热变性10min，待液体完全冷却后置于-20℃保存。
（3）蛋白浓度测定（BCA法）
a. BCA工作液的配置
根据样品数量，按50体积BCA试剂A加入1体积BCA试剂B（50:1）配置适量BCA工作液，充分混匀。BCA工作液室温24h内稳定。
b. 标准品测定
取10μl蛋白标准品（5mg/ml BSA）稀释至50μl，使终浓度为1mg/ml。稀释后的蛋白标准品可以-20℃长期保存。此标准品溶液的稀释液可使用去离子水或1*PBS。将标准品按0、1、2、4、8、12、16、20μl加入到96孔板中，加稀释液补足到20μl（见附表）。加适当体积样品到96孔板的样品孔中，如果样本不足20μl，需加稀释液补足到20μl。请注意记录样品体积。各孔加入200μl BCA工作液，37℃放置20-30min。用酶标仪测定A562，或540-595nm之间的其他波长吸光度。根据标准曲线和使用的样品体积计算出样品的蛋白浓度。
a. Western Transfer Buffer至少提前2h （即开始电泳后）放入-20℃冰箱预冷，但注意避免结冰。
b. 根据胶体大小,将Filter Paper及Nitrocellulose membrane剪裁至合适尺寸。
c. 目的蛋白＞20KD选择0.45μm NC膜/PVDF膜；目的蛋白＜20KD选择0.2μmNC膜或PVDF膜，选择完毕后将NC膜放在Western Transfer Buffer中浸泡备用，注意如使用的是PVDF膜需先放入甲醇中浸泡5-10min，再放入Western Transfer Buffer中浸泡备用。
（2）裂解液&洗杂液：Cell lysis buffer for IP (without inhibitors)
（3）蛋白酶抑制剂
（4）封闭液：含 3% BSA 的 1X PBS
（5）1×PBS 缓冲液
（6）5×loding buffer（使用时用去离子水稀释至工作浓度即可）
（7）Control IgG （AC005/ AC011/AC034）
二、实验步骤
1、样本处理
（1）贴壁培养细胞
a. 取裂解液室温溶解混匀，根据需要选择添加或不添加蛋白酶抑制剂。
b. 去除贴壁细胞的培养液，用PBS、NS或无血清培养基清洗1次，低速离心，弃上清，留取沉淀。
c. 按照6孔板每孔加入100~200μl裂解液的比例，加入裂解液。移液器轻轻吹打，使裂解液和细胞充分接触。通常裂解液作用于细胞1~5s内，细胞会被裂解。
d. 1000~12000g，离心3~5min（如果用冷冻离心机4℃效果更佳），取上清。
（2）悬浮培养细胞
a. 取裂解液室温溶解混匀，根据需要选择添加或不添加蛋白酶抑制剂。
b. 速离心悬浮细胞，弃上清，收集沉淀。
c. 手指轻弹细胞，使其松散。按照6孔板每孔加入100~200μl裂解液的比例，加入NP-40裂解液。通常6孔板每孔加入100~200μl裂解液已经足够，但如果细胞密度非常高可以适当加大裂解液的用量150~200μl，再用手指轻弹以充分裂解细胞。充分裂解后应无明显沉淀。
d. 1000~12000g，离心3~5min（如果用冷冻离心机4℃效果更佳），取上清。
（3）组织样本
a. 取裂解液室温溶解混匀，根据需要选择添加或不添加蛋白酶抑制剂。
b. 把组织剪切成细小的碎片，越小越好。
c. 取液氮或超低温冰箱中冷冻30min以上的组织，迅速用液氮研磨，研磨过程尽量控制在1~2min之内，以减少蛋白的降解。
d. 按照每20mg组织加入100~200μl裂解液的比例，加入含有PMSF的裂解液。冰上或4℃裂解30-60min。（步骤3、4也可采用以下过程：按照每20mg组织加入100~200μl裂解液的比例加入NP-40裂解液。用玻璃匀浆器或组织研磨器匀浆，直至充分裂解，过程尽量控制在1~2min之内，以减少蛋白的降解。）
e. 按照每20mg组织加入100~200μl裂解液的比例，加入裂解液。
f. 1000~12000g，4℃离心10~15min（如无低温离心机，室温下离心也可），取上清。
2、磁珠预处理
（1）将rProtein A/G Plus MaqPoly Beads颠倒或漩涡混匀，翻转瓶身发现底部无黑色沉淀即可。
（2）取30μl rProtein A/G Plus MaqPoly Beads至新的EP管中，放在磁分离器上，待溶液澄清后，用移液器吸弃保护液。
（3）将EP管从磁分离器上取下来，加入1ml Cell lysis buffer for IP (without inhibitors)，混匀，放置在磁分离器上，收集磁珠，用移液器吸弃洗杂液，重复2次。
