Intramuscular variation of meat quality in the porcine longissimus thoracis et lumborum (LTL) muscle was evaluated by assessing the differential abundance of proteome components. Twenty LTL muscles were individually divided into three regions (anterior, medial, and posterior) according to meat color. CIE L^⁎ and b^⁎ were higher (P < 0.05), but Warner–Bratzler shear force (WBSF) was lower (P < 0.05) in the anterior region, where myosin-1 and -2, TPM2, MLC1f, MLC2, Hsp27, and TPI1 were highly (P < 0.05) abundant. However, CIE a^⁎, drip loss, and WBSF were higher (P < 0.05) in the medial region. Glycolysis enzymes including enolase 3, ALDOA, LDHA, PGM1, and TPI1 were highly abundant in the medial and posterior region, whereas GAPDH and myoglobin were overexpressed in the medial region (P < 0.05). Therefore, intramuscular variations in color, water-holding capacity, and tenderness were associated with differential abundance of the proteome, especially contractile, glycolysis enzymes, and Hsp27.

通过评估蛋白质组组分的丰度差异来评估猪胸大腿腰肌（LTL）肌肉中肉质的肌肉内变化。根据肉色，将20个LTL肌肉分别分为三个区域（前部，内侧和后部）。CIE ^L⁎和^b⁎较高（P <0.05），但在前部区域，其中肌球蛋白-1和-2，TPM2，MLC1f，MLC2，Hsp27的Warner-Bratzler剪切力（WBSF）较低（P <0.05）。和TPI1含量很高（P <0.05）。但是，CIE一个^⁎，滴水损失和WBSF在内侧区域较高（P <0.05）。糖醇分解酶包括烯醇酶3，ALDOA，LDHA，PGM1和TPI1在内侧和后部区域高度丰富，而GAPDH和肌红蛋白在内侧区域过表达（P <0.05）。因此，肌内颜色，持水量和嫩度的变化与蛋白质组特别是收缩，糖酵解酶和Hsp27的丰度差异有关。